CN112215496B - Pig ration quality assessment method, device and storage medium - Google Patents

Abstract

The invention discloses a method, a device and a storage medium for evaluating the quality of pig ration, wherein the method for evaluating the quality of pig ration comprises the following steps: obtaining digestion energy DE of the daily ration to be measured; obtaining the digestible crude protein content DCP of the ration to be tested; obtaining the digestible acid washing fiber content dADF of the ration to be measured; obtaining the average daily feed intake ADFI of the daily ration to be measured; calculating the evaluation index PGI of the daily ration to be measured according to the formula I _a The method comprises the steps of carrying out a first treatment on the surface of the Based on the evaluation index PGI _a And evaluating the nutrition quality of the daily ration to be tested. The invention calculates the evaluation index PGI of the daily ration to be measured through the formula I _a Based on the rating index PGI _a The nutritional quality of the daily ration to be measured can be evaluated, the cost is low and the daily ration is quick, in addition, the nutritional quality of the daily ration is quantized, and the accuracy of the evaluation result is high.

Description

Method, device and storage medium for evaluating the quality of pig diets

Technical Field

The invention relates to the technical field of breeding, and in particular to a method, a device and a storage medium for evaluating the quality of pig diets.

Background Art

In the pig farming industry, the nutritional quality and utilization rate of feed are crucial. By evaluating the nutritional value of pig feed, the growth performance and feed utilization rate of pigs can be improved, thereby improving the economic benefits of pig farming.

At present, the existing evaluation of the nutritional quality of pig diets in my country mainly focuses on sensory evaluation such as smell, color, freshness and other items, as well as the determination of the content of chemical components. Such evaluation methods are subject to greater subjective influence and have low accuracy. In traditional animal nutrition, the most direct method to evaluate the nutritional quality of pig diets is animal feeding experiments. This method usually requires a long growth process for pigs, which is not only time-consuming and costly, but also easily affected by factors such as the environment, disease and pig grouping. Therefore, it is urgent to establish a fast and accurate evaluation method.

Summary of the invention

The main purpose of the present invention is to provide a method, device and storage medium for evaluating the quality of pig diets, aiming to quickly and accurately evaluate the nutritional quality of growing and fattening pig diets.

To achieve the above object, the present invention provides a method for evaluating the quality of pig diets. The method for evaluating the quality of pig diets comprises the following steps:

Obtain the digestible energy DE of the diet to be tested;

Obtaining the digestible crude protein content DCP of the diet to be tested;

Obtaining the digestible acid detergent fiber content dADF of the test diet;

Obtaining the average daily feed intake ADFI of the test diet;

The assessment index PGI _a of the diet to be tested is calculated according to Formula I, wherein the Formula I is:

According to the evaluation index PGI _a , the nutritional quality of the diet to be tested is evaluated.

Optionally, the step of evaluating the nutritional quality of the diet to be tested according to the evaluation index PGI _a comprises:

It is determined whether the evaluation index PGI _a is not less than 100. If the evaluation index PGI _a is not less than 100, it is determined that the nutritional quality of the diet to be tested is qualified.

Optionally, the step of evaluating the nutritional quality of the diet to be tested according to the evaluation index PGI _a comprises:

The nutritional qualities of the multiple diets to be tested are ranked according to the order of the evaluation indexes PGI _a of the multiple diets to be tested.

Optionally, the step of obtaining the digestible energy DE of the diet to be tested comprises:

Obtain the crude ash content Ash (%DM), crude protein content CP (%DM), crude fat content EE (%DM) and neutral detergent fiber content NDF (%DM) in the diet to be tested;

The digestible energy DE of the test diet was calculated according to Formula II, wherein Formula II is: DE=4168-(9.1×Ash)+(1.9×CP)+(3.9×EE)-(3.6×NDF).

Optionally, the step of obtaining the digestible crude protein content DCP of the diet to be tested comprises:

Obtaining the crude protein content CP in the diet to be tested;

Obtaining the CP digestibility of the diet to be tested;

Obtaining the dry matter content DM of the diet to be tested;

The digestible crude protein content DCP of the test diet is calculated according to Formula III, wherein the Formula III is: DCP=(CP×CP digestibility)/DM.

Optionally, the step of obtaining the digestible acid detergent fiber content dADF of the diet to be tested comprises:

Obtaining the acid detergent fiber content ADF in the diet to be tested;

Obtaining the ADF digestibility of the diet to be tested;

Obtaining the dry matter content DM of the diet to be tested;

The digestible crude protein content dADF of the test diet is calculated according to Formula IV, wherein the Formula IV is: dADF=(ADF×ADF digestibility)/DM.

Optionally, the step of obtaining the average daily feed intake ADFI of the test diet comprises:

Obtaining the body weight G of the pigs to be fed with the test diet;

When the body weight G is less than 8 kg, ADFI is 0.3;

When the body weight G is 8-20 kg, ADFI is 0.75;

When the body weight G is 20-35 kg, the ADFI is 1.45;

When the body weight G is 35-60 kg, the ADFI is 1.9;

When the body weight G is greater than 60 kg, the ADFI is 2.55.

In addition, the present invention also proposes a pig diet quality assessment device, which includes a memory, a processor, and a pig diet quality assessment program stored in the memory and executable on the processor, wherein the pig diet quality assessment program is configured to implement the steps of the pig diet quality assessment method as described above.

In addition, the present invention also proposes a storage medium, on which a pig diet quality assessment program is stored. When the pig diet quality assessment program is executed by a processor, the steps of the pig diet quality assessment method described above are implemented.

In the technical solution provided by the present invention, an evaluation index PGI _a and formula I are proposed. The evaluation index PGI _a of the diet to be tested can be calculated by formula I. Based on the evaluation index PGI _a , the nutritional quality of the diet to be tested can be evaluated with low cost and rapidity. In addition, the nutritional quality of the diet is quantified, and the evaluation result is highly accurate.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a device structure of a hardware operating environment involved in an embodiment of the present invention;

FIG. 2 is a schematic flow chart of an embodiment of a method for evaluating the quality of pig diets proposed by the present invention.

The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

It should be noted that, in the embodiments, those without specifying specific conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. Those without specifying the manufacturer of reagents or instruments used are conventional products that can be purchased commercially. In addition, the technical schemes between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in the field to achieve. When the combination of the technical schemes is mutually contradictory or cannot be achieved, it should be considered that the combination of such technical schemes does not exist, and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention.

In the pig farming industry, the nutritional quality and utilization rate of feed are crucial. By evaluating the nutritional value of pig feed, the growth performance and feed utilization rate of pigs can be improved, thereby improving the economic benefits of pig farming.

At present, the existing evaluation of the nutritional quality of pig diets in my country mainly focuses on sensory evaluation such as smell, color, freshness and other items, as well as the determination of the content of chemical components. Such evaluation methods are subject to greater subjective influence and have low accuracy. In traditional animal nutrition, the most direct method to evaluate the nutritional quality of pig diets is animal feeding experiments. This method usually requires a long growth process for pigs, which is not only time-consuming and costly, but also easily affected by factors such as the environment, disease and pig grouping. Therefore, it is urgent to establish a fast and accurate evaluation method.

In view of this, the present invention proposes a device for evaluating the quality of pig diets, please refer to Figure 1, the device for evaluating the quality of pig diets may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a button, and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

Those skilled in the art will appreciate that the structure of the device shown in FIG. 1 does not constitute a limitation on the device, and may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components.

As shown in FIG. 1 , the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a pig diet quality assessment program.

In the device shown in FIG1 , the processor 1001 calls the pig diet quality assessment program stored in the memory 1005 and performs the following operations:

Obtain the digestible energy DE of the diet to be tested;

Obtaining the digestible crude protein content DCP of the diet to be tested;

Obtaining the digestible acid detergent fiber content dADF of the test diet;

Obtaining the average daily feed intake ADFI of the test diet;

The assessment index PGI _a of the diet to be tested is calculated according to Formula I, wherein the Formula I is:

According to the evaluation index PGI _a , the nutritional quality of the diet to be tested is evaluated.

Furthermore, the processor 1001 may call the pig diet quality assessment program stored in the memory 1005, and further perform the following operations:

According to the evaluation index PGI _a , the steps of evaluating the nutritional quality of the diet to be tested include:

It is determined whether the evaluation index PGI _a is not less than 100. If the evaluation index PGI _a is not less than 100, it is determined that the nutritional quality of the diet to be tested is qualified.

Furthermore, the processor 1001 may call the pig diet quality assessment program stored in the memory 1005, and further perform the following operations:

According to the evaluation index PGI _a , the steps of evaluating the nutritional quality of the diet to be tested include:

The nutritional qualities of the multiple diets to be tested are ranked according to the order of the evaluation indexes PGI _a of the multiple diets to be tested.

Furthermore, the processor 1001 may call the pig diet quality assessment program stored in the memory 1005, and further perform the following operations:

The steps to obtain the digestible energy DE of the diet to be tested include:

Obtain the crude ash content Ash (%DM), crude protein content CP (%DM), crude fat content EE (%DM) and neutral detergent fiber content NDF (%DM) in the diet to be tested;

The digestible energy DE of the diet to be tested is calculated according to Formula II, wherein the Formula II is: DE=4168-(9.1×Ash)+(1.9×CP)+(3.9×EE)-(3.6×NDF);

According to the crude protein content CP and the acid detergent fiber content ADF, the digestible crude protein content DCP and the digestible acid detergent fiber content dADF are calculated.

Furthermore, the processor 1001 may call the pig diet quality assessment program stored in the memory 1005, and further perform the following operations:

The steps of obtaining the digestible crude protein content DCP of the diet to be tested include:

Obtaining the crude protein content CP in the diet to be tested;

Obtaining the CP digestibility of the diet to be tested;

Obtaining the dry matter content DM of the diet to be tested;

The digestible crude protein content DCP of the test diet is calculated according to Formula III, wherein the Formula III is: DCP=(CP×CP digestibility)/DM.

Furthermore, the processor 1001 may call the pig diet quality assessment program stored in the memory 1005, and further perform the following operations:

The steps of obtaining the digestible acid detergent fiber content dADF of the diet to be tested include:

Obtaining the acid detergent fiber content ADF in the diet to be tested;

Obtaining the ADF digestibility of the diet to be tested;

Obtaining the dry matter content DM of the diet to be tested;

The digestible crude protein content dADF of the test diet is calculated according to Formula IV, wherein the Formula IV is: dADF=(ADF×ADF digestibility)/DM.

Furthermore, the processor 1001 may call the pig diet quality assessment program stored in the memory 1005, and further perform the following operations:

The steps of obtaining the average daily feed intake ADFI of the test diet include:

When the body weight G is less than 8 kg, ADFI is 0.3;

When the body weight G is 8-20 kg, ADFI is 0.75;

When the body weight G is 20-35 kg, the ADFI is 1.45;

When the body weight G is 35-60 kg, the ADFI is 1.9;

When the body weight G is greater than 60 kg, the ADFI is 2.55.

Refer to FIG. 2 , which is an embodiment of a method for evaluating the quality of pig diets proposed by the present invention. In this embodiment, the method for evaluating the quality of pig diets includes the following steps:

Step S10, obtaining the digestible energy DE of the diet to be tested.

Digestible energy DE is the energy contained in the digestible nutrients of feed. There are many ways to obtain digestible energy DE. Specifically, it can be directly measured using a bionic digestion instrument, which is simple and quick to obtain. It can also be obtained by establishing a nutritional model and obtaining it through in vitro experiments to reduce the cost of purchasing a bionic digestion instrument.

Specifically, the steps of establishing a nutritional model and obtaining the digestible energy DE of the diet to be tested through in vitro experiments may include:

Step S101, obtaining the crude ash content Ash (%DM), crude protein content CP (%DM), crude fat content EE (%DM) and neutral detergent fiber content NDF (%DM) in the test diet.

Among them, crude ash content Ash (%DM), crude protein content CP (%DM), crude fat content EE (%DM) and neutral detergent fiber content NDF (%DM) can be obtained by the following steps:

S1011, establish an in vitro "stomach-small intestine digestion" simulation system and use the simulation system to pretreat the diet.

Step S1011 specifically includes: drying the diet to be tested and then crushing it through a 100-mesh sieve. Weigh 5g (accurate to 0.0001g) of the sieved sample, add 500mg of pepsin, 50ml of HCl/NaCl solution, add 0.5ml of bacterial growth inhibitor (chloramphenicol solution with a mass concentration of 0.5%), put it in a constant temperature shaker, and digest it for 1h at 40°C and 120r/min. Then, add 2.5ml of 2mol/L NaOH solution, adjust the pH to 6.5-7.5, and add 20mL of 0.1mol/L phosphate buffer to stabilize the pH, then add 50mg of trypsin, put it in a constant temperature shaker, and digest it for 1h at 40°C and 120r/min to obtain a substrate for standby use. Take 6-8 fresh feces samples of fattening pigs weighing 30-50kg, add 5ml of physiological saline per gram of fresh feces sample, mix the fresh feces sample with the physiological saline and filter it to make a bacterial source. Place 1 g of substrate in a fermentation bottle, add 10 mL of bacterial source and 164 mL of culture medium, pass _CO2 to evacuate, seal with a rubber stopper, then place in a constant temperature oscillator, shake and culture at 37-40°C for 36-50 hours, collect the fermentation product and dry it to obtain the dietary residue.

S1012, respectively testing the contents of various nutrients in the diet residue and the diet to be tested, the test items include: crude ash content Ash, crude protein content CP, crude fat content EE, neutral detergent fiber content NDF and dry matter content DM.

In specific implementation, the content of each nutrient component can be detected by conventional detection methods in the field, for example, the crude protein content CP can be detected by the Kjeldahl method; the crude fat content EE can be detected by the oil weight method; the crude ash content Ash can be detected by the ignition residue method; and the neutral detergent fiber content NDF can be detected by the acid-base method.

S1013, calculating the digestibility of each nutrient according to Formula V, wherein Formula V is: digestibility of a certain nutrient (%) = (content of a certain nutrient in the sample - content of a certain nutrient in the residue) / content of a certain nutrient in the sample) × 100.

S1014, calculate the content of each nutrient in the test diet (%DM) according to formula VI, wherein formula VI is: content of each nutrient (%DM) = percentage content of the nutrient in the diet (%) × digestibility of the nutrient (%)/DM (%).

Taking CP as an example, in Formula VI, CP (% DM) = (crude protein content CP × CP digestibility) / DM (%). Similarly, based on Formula VI, the crude ash content Ash (% DM), crude fat content EE (% DM) and neutral detergent fiber content NDF (% DM) are calculated.

It should be noted that in the above step S1011, the various solutions involved are prepared according to the preparation method in Table 1 below. All reagents used in the preparation method are common laboratory reagents that can be purchased on the market. Units such as g, ml, and L are used only for ease of understanding. However, it should be understood that the preparation methods of the various solutions provided in the present invention are not limited to the above-mentioned measurement units. In actual applications, the amount of reagents used can be proportionally increased or decreased as needed.

Table 1 Preparation method

Step S102, calculating the digestible energy DE of the diet to be tested according to Formula II, wherein Formula II is: DE=4168-(9.1×Ash)+(1.9×CP)+(3.9×EE)-(3.6×NDF).

It should be noted that in Formula II, the unit of DE is kcal/Kg, which needs to be converted into MJ/Kg. Ash, CP, EE and NDF involved in the formula refer to the digestible crude ash content Ash, digestible crude fat content EE and digestible neutral detergent fiber content NDF, and all indicators are expressed in g/kg DM.

Step S20, obtaining the digestible crude protein content DCP of the diet to be tested.

DCP is the percentage of digestible crude protein (%), which can be achieved by the following steps:

Step S201, obtaining the crude protein content CP in the diet to be tested;

Step S202, obtaining the CP digestibility of the diet to be tested;

Step S203, obtaining the dry matter content DM of the diet to be tested;

Step S204, calculating the digestible crude protein content DCP of the diet to be tested according to Formula III, wherein the Formula III is: DCP=(CP×CP digestibility)/DM.

Step S30, obtaining the digestible acid detergent fiber content dADF of the diet to be tested.

dADF is the digestible acid detergent fiber content (%), which can be achieved by the following steps:

Step S301, obtaining the acid detergent fiber content ADF in the diet to be tested;

Step S302, obtaining the ADF digestibility of the diet to be tested;

Step S303, obtaining the dry matter content DM of the diet to be tested;

Step S304, calculating the digestible crude protein content dADF of the diet to be tested according to Formula IV, wherein the Formula IV is: dADF=(ADF×ADF digestibility)/DM.

It should be noted that the acquisition method of step S301 and step S302 is the same as the detection method of other nutrients mentioned above, and will not be described in detail here.

Step S40, obtaining the average daily feed intake ADFI of the diet to be tested.

Average daily feed intake (ADFI) refers to the average daily weight of the diet consumed by growing and finishing pigs within a certain period of time during the actual production process. Average daily feed intake (ADFI) can be measured through animal experiments. Since there is no need to examine other growth indexes of animals after consuming the diet, such as feed-to-weight ratio (F/G), diarrhea rate (DR), blood biochemical indicators, etc., animal experiments have a faster detection speed when only testing the average daily feed intake (ADFI) of the diet.

Furthermore, the common diets currently on the market have undergone multiple research tests and data statistics, and after multiple research tests and data statistics, the values of the average daily feed intake ADFI of the diet components have been confirmed. After statistics of the average daily feed intake ADFI of various diets in this embodiment, it is found that when the evaluation index PGI _a is used to evaluate the quality of the diet, the average daily feed intake ADFI involved in its calculation formula I can obtain values according to the following classification methods. Specifically, step S40 may include:

Step S41, obtaining the weight G of the pigs to be fed with the diet to be tested;

Step S42, when the weight G is less than 8Kg, ADFI is 0.3Kg/d; when the weight G is 8-20Kg, ADFI is 0.75Kg/d; when the weight G is 20-35Kg, ADFI is 1.45Kg/d; when the weight G is 35-60Kg, ADFI is 1.9Kg/d; when the weight G is greater than 60Kg, ADFI is 2.55Kg/d. And after multiple comparative tests, the relative deviation of the assessment index PGI _a calculated based on the ADFI obtained from the weight G distribution interval and the assessment index PGI _a calculated based on the ADFI obtained from the animal test is no more than 10%.

Step S50, calculating the assessment index PGI _a of the diet to be tested according to Formula I, wherein Formula I is:

Among them, DE is the digestible energy DE of the test diet (unit: MJ/Kg); DCP is the digestible crude protein content (%DM); dADF is the acid detergent fiber content (%DM); ADFI is the average daily feed intake ADFI of the test diet (unit: Kg/d).

Step S60: Evaluate the nutritional quality of the diet to be tested according to the evaluation index PGI _a .

The evaluation index PGI _a unifies energy, protein indicators, fiber composition and dietary feed intake to comprehensively evaluate the nutritional quality of pig diets. It can reflect the nutritional quality of pig diets more comprehensively, objectively and accurately. Moreover, the entire evaluation process does not involve long-term animal experiments and is not affected by factors such as environment, disease and pig grouping. The evaluation is accurate and fast.

Specifically, the higher the evaluation index PGI _a is, the higher the nutritional quality of the diet is. In this way, the nutritional quality of the diet to be tested can be evaluated based on the evaluation index PGI _a , which is not only low-cost and fast, but also, because the nutritional quality of the diet is quantified, the evaluation result of the nutritional quality is more intuitive and has higher accuracy.

In specific implementation, step S60 may include the following steps:

Step S61, judging whether the evaluation index PGI _a is not less than 100. If the evaluation index PGI _a is not less than 100, judging that the nutritional quality of the diet to be tested is qualified.

In this embodiment, the evaluation index PGI _a is used as the evaluation index, and the evaluation standard is set to 100. When the evaluation index PGI _a ≥100, it can be determined that the nutritional quality of the diet to be tested is qualified and can be used to feed growing and fattening pigs; conversely, when the evaluation index PGI _a is less than 100, it can be determined that the nutritional quality of the diet to be tested is unqualified and is not suitable for feeding growing and fattening pigs.

In addition, step S60 can also be implemented by the following steps:

Step S62: Sort the nutritional qualities of the multiple daily diets to be tested according to the order of their PGI _a .

Based on the fact that the larger the evaluation index PGI _a is, the higher the nutritional quality of the diet to be tested is, in this embodiment, the diets to be tested are sorted according to the size of the evaluation index PGI _a to determine the order of the nutritional quality of each diet to be tested. For example, if the evaluation index PGI _a corresponding to diets A, B, C, and D increases in sequence, it means that the nutritional quality of these four diets is improved in sequence.

The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention, and are not used to limit the present invention.

The quality of the four diets listed in Table 2 below was evaluated. All four diets are suitable for feeding pigs with a body weight G of 24 to 32 kg.

Table 2 Diet formula

Four diets were evaluated as follows:

(1) Dry the diet to be tested and grind it through a 100-mesh sieve. Weigh 5 g (accurate to 0.0001 g) of the sieved sample, add 500 mg of pepsin, 50 ml of HCl/NaCl solution, and 0.5 ml of bacterial growth inhibitor (chloramphenicol solution with a mass concentration of 0.5%), place it in a constant temperature shaker, and digest it for 1 h at 40°C and 120 r/min. Then, add 2.5 ml of 2 mol/L NaOH solution to adjust the pH to 6.5-7.5, and add 20 mL of 0.1 mol/L phosphate buffer to stabilize the pH. Subsequently, add 50 mg of trypsin, place it in a constant temperature shaker, and digest it for 1 h at 40°C and 120 r/min to obtain the substrate for later use. Take 6-8 fresh feces samples from fattening pigs weighing 30-50 kg, add 5 ml of physiological saline per gram of fresh feces sample, mix the fresh feces sample and physiological saline, and filter them to prepare the bacterial source. Place 1 g of substrate in a fermentation bottle, add 10 mL of bacterial source and 164 mL of culture medium, pass _CO2 to evacuate, seal with a rubber stopper, then place in a constant temperature oscillator, shake and culture at 37-40°C for 36-50 hours, collect the fermentation product and dry it to obtain the dietary residue.

The contents of various nutrients in the diet residue and the diet to be tested were tested according to the following methods. The results are shown in Table 3:

Crude ash content Ash: Ignition residue method;

Crude protein content CP: Kjeldahl method;

Crude fat content EE: oil weight method;

Neutral detergent fiber content NDF: acid-base method.

The digestibility of each nutrient component was calculated according to Formula V, where Formula V is: digestibility of a nutrient component (%) = (content of a nutrient component in the sample - content of a nutrient component in the residue) / content of a nutrient component in the sample) × 100. The results are recorded in Table 3.

According to formula VI, the content of each nutrient in the diet to be tested (%DM) is calculated, wherein formula VI is: the content of each nutrient (%DM) = the percentage content of the nutrient in the diet (%) × the digestibility of the nutrient (%) / DM (%). Finally, the digestible energy DE of the diets of groups A and B is calculated according to formula II, wherein the formula II is: DE = 4168-(9.1×Ash)+(1.9×CP)+(3.9×EE)-(3.6×NDF), and the results are recorded in Table 3. At the same time, the digestible energy DE of groups C and D was detected using a bionic digestion instrument.

(2) Refer to Table 3 to obtain the DCP and dADF values of each group of diets.

(3) Based on the body weight G of the pigs to be fed the three diets, which was 24 to 32 kg, it was found that the ADFI of the four diets was 1.308 kg/d.

(4) According to the formula Based on the DE, DCP and dADF values recorded in Table 3, the PGI _a of each diet group was calculated as shown in Table 4.

(5) Evaluation results: From the data recorded in Table 4, it can be seen that the PGI _a of the three groups of diets A, B, and C are all greater than 100, and the PGI _a of group D is less than 100. In other words, the diets of groups A, B, and C are all suitable for feeding pigs, while group D is not. At the same time, the PGI _a of the three groups of diets A, B, and C is: B>C>A, indicating that the nutritional quality of the three groups of diets is from high to low, group B, group C, and group A.

Table 3

Note: In the same line, the same shoulder marks indicate no significant difference (P>0.05), while different shoulder marks indicate significant difference (P<0.05).

Table 4 Evaluation indicators of each group

_PGI PBGI Group A 125.113 0.554 Group B 174.414 0.569 Group C 130.065 0.558 Group D 99.729 0.467

(I) Evaluation method accuracy

The feeding effect of the diet evaluated by the evaluation method of the present invention is obtained through a feeding test.

Twenty-four healthy Duroc×Chang×Da hybrid pigs with an average weight of 28.2±4.46kg were selected and randomly divided into 4 groups (6 pigs in each group), namely 4 experimental groups (experimental group 1, experimental group 2, experimental group 3, and experimental group 4). Among them, experimental group 1, experimental group 2, experimental group 3, and experimental group 4 were fed with diets A, B, C, and D respectively. In the pre-feeding period, the pigs were fed accurately and quantitatively according to 85% to 90% of the free feed intake of the experimental pigs, and then transitioned to the experimental period. The pre-feeding period was 5 days and the experimental period was 28 days. The average daily weight gain (ADG), average daily feed intake (ADFI) and feed-to-weight ratio (F/G) of the fattening pigs in each group were investigated, and the results are shown in Table 5.

Table 5 Comparison of growth performance of fattening pigs

ADG ADFI F/G Experimental Group 1 529.88 1308.63 2.59 Experimental Group 2 588.63 1333.63 2.41 Experimental Group 3 571.31 1349.40 2.53 Experimental Group 4 523.57 1302.63 2.49

It can be seen from the data in Table 5 above that the growth performance of the experimental pigs in experimental groups 1 to 3 is significantly better than that in experimental group 4, and among experimental groups 1 to 3, the growth performance of the experimental pigs in experimental group 2 is the best, indicating that the nutritional quality assessment results made by the diet assessment method provided by the present invention are accurate.

(II) Evaluation method precision study

Comparative example: The PBGI evaluation index was calculated according to the calculation formula PBGI = (DE × ADFI) / K, and the nutritional quality of the three diets of groups A, B, and C was evaluated based on the evaluation index PBGI. DE and ADFI can be found in Table 3, K is ADG/DE, in g/MJ, which can be obtained according to the Chinese pig feeding standards, based on the weight G of the pigs to be consumed in the three diets being 24 to 32 kg, and the K values of the three diets are all 46.3. The PBGI calculation results are recorded in Table 4.

Referring to Table 4, it can be seen that the PBGI index of the three groups of diets A, B, and C also presents the order of B>C>A, that is, according to the PBGI index, the nutritional quality of the three groups of diets from high to low is group B, group A, and group C. However, the PBGI index of group A and group C is 0.554 and 0.558, respectively, and the relative deviation value between the two is 0.72%, while the PGI _a index of group B and group C is 125.113 and 130.065, respectively, and the relative deviation value between the two is 3.9%. Compared with the PBGI index, the PGI _a index results are more different and have better discrimination. In practical application, the evaluation precision is better, and it is not easy for random errors caused by external factors to affect the evaluation results.

The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims (7)

1. A method for evaluating the quality of pig diet, which is characterized in that it includes the following steps: Obtain the digestible energy DE of the diet to be tested; Obtain the digestible crude protein content DCP of the diet to be tested; Obtain the digestible acid detergent fiber content dADF of the diet to be tested; Obtain the average daily feed intake ADFI of the diet to be tested; Calculate the evaluation index PGI _a of the diet to be tested according to Formula I, where the Formula I is: ; Evaluate the nutritional quality of the diet to be tested according to the evaluation index PGI _a ; Wherein, the steps of obtaining the digestible crude protein content DCP of the diet to be tested include: Obtain the crude protein content CP in the diet to be tested; Obtain the CP digestibility of the diet to be tested; Obtain the dry matter content DM of the diet to be tested; Calculate the digestible crude protein content DCP of the diet to be tested according to formula III, where the formula III is: DCP=(CP×CP digestibility)/DM; The steps of obtaining the digestible acid detergent fiber content dADF of the diet to be tested include: Obtain the acid detergent fiber content ADF in the diet to be tested; Obtain the ADF digestibility of the diet to be tested; Obtain the dry matter content DM of the diet to be tested; Calculate the digestible crude protein content dADF of the diet to be tested according to formula IV, where the formula IV is: dADF=(ADF×ADF digestibility)/DM. 2. The method for evaluating the quality of pig diets according to claim 1, wherein the step of evaluating the nutritional quality of the diet to be tested according to the evaluation index PGI _a includes: Determine whether the evaluation index PGI _a is not less than 100. If the evaluation index PGI _a is not less than 100, it is judged that the nutritional quality of the diet to be tested is qualified. 3. The method for evaluating the quality of pig diets according to claim 1, wherein the step of evaluating the nutritional quality of the diet to be tested according to the evaluation index PGI _a includes: According to the order of the evaluation index PGI _a of the multiple diets to be tested, the nutritional quality of the multiple diets to be tested is sorted. 4. The method for evaluating the quality of pig diets according to claim 1, wherein the step of obtaining the digestible energy DE of the diet to be tested includes: Obtain the crude ash content Ash (%DM), crude protein content CP (%DM), crude fat content EE (%DM) and neutral detergent fiber content NDF (%DM) in the diet to be tested; Calculate the digestible energy DE of the diet to be tested according to formula II, where the formula II is: DE = 4168-(9.1 ×Ash)+(1.9 × CP)+(3.9 × EE)-(3.6 × NDF) . 5. The method for evaluating the quality of pig diets according to claim 1, wherein the step of obtaining the average daily feed intake ADFI of the diet to be tested includes: Obtain the body weight G of the pigs to be fed the diet to be tested; When the weight G is less than 8Kg, ADFI is 0.3; When the weight G is 8~20Kg, ADFI is 0.75; When the weight G is 20~35Kg, ADFI is 1.45; When the body weight G is 35~60Kg, ADFI is 1.9; When the body weight G is greater than 60Kg, the ADFI is 2.55. 6. A pig diet quality assessment device, characterized in that the pig diet quality assessment device includes a memory, a processor, and a pig diet quality assessment program that is stored in the memory and can be run on the processor. , the pig diet quality assessment program is configured to implement the steps of the pig diet quality assessment method according to any one of claims 1 to 5. 7. A storage medium, characterized in that a pig diet quality assessment program is stored on the storage medium. When the pig diet quality assessment program is executed by a processor, the pig diet quality assessment program implements the method according to any one of claims 1 to 5. The steps of the described method for evaluating the quality of pig diets.