CN107811128B

CN107811128B - Feed additive capable of adjusting intestinal flora of piglets

Info

Publication number: CN107811128B
Application number: CN201711112804.0A
Authority: CN
Inventors: 郭丽; 黄蓉; 卢秋咏; 梁冬霞; 邹新华
Original assignee: Boon Group Co Ltd
Current assignee: Boon Group Co Ltd
Priority date: 2017-11-13
Filing date: 2017-11-13
Publication date: 2021-04-20
Anticipated expiration: 2037-11-13
Also published as: CN112913978B; CN112913978A; CN107811128A

Abstract

The invention relates to a feed additive capable of regulating intestinal flora of piglets, wherein the weight ratio of active ingredients galactomannan-oligosaccharide to senkyunolide A is (10:1) - (1: 10). Compared with the common feed additive, the feed additive provided by the invention is simple in preparation method, reasonable in compatibility and remarkable in curative effect, and can be used for remarkably improving intestinal flora of piglets. The additive has no western medicine components, so the feed additive has no toxic or side effect and no drug resistance.

Description

Feed additive capable of adjusting intestinal flora of piglets

Technical Field

The invention relates to the field of feeds, and in particular relates to a piglet feed additive.

Background

Since the discovery of the growth-promoting effect of antibiotics on animals in the middle of the 20 th century, antibiotics have been widely used as feed additives in the breeding industry; in view of the negative effects of antibiotics and the growing concern of people about food health, many countries have made laws and regulations to prohibit the use of antibiotics and chemically synthesized drugs. In recent years, development and research of safe, nontoxic and side-effect-free antibiotic substitutes have begun.

Research proves that the fructo-oligosaccharide can improve the production performance and disease resistance of animals such as pigs, chickens, cattle and the like; the mannan oligosaccharide can improve the production performance of animals such as mice, pigs, chickens, cows, aquatic animals and the like, promote the proliferation of beneficial flora (such as bifidobacterium, lactobacillus and the like) in intestinal tracts, inhibit the reproduction of harmful bacteria (such as escherichia coli) and improve the immunity of organisms.

Galactomannan-oligosaccharides (GMOS), also known as galactomannan-oligosaccharides, are oligosaccharides formed by connecting galactomannan and glucose through glycosidic bonds, and are a functional oligosaccharide variety independently developed in China. Galactomannan oligosaccharides are reported to have the following functions: firstly, by optimizing intestinal microecological systems, intestinal flora taking bifidobacteria and lactobacilli as dominant bacteria is formed, and beneficial health care function is played for hosts. Secondly, the coating has the functions of identifying, adhering and eliminating pathogenic microorganisms. Thirdly, the compound can be an immunomodulator, has the function of activating the immune system response, and has great interest. It is currently widely believed that mannooligosaccharides can enhance non-specific immunity in animals. In recent years, various researchers verify the application effect of the feed on allogynogenetic crucian carp juvenile fish, broiler chickens, meat rabbits, early weaned piglets, routine weaned piglets, growing-finishing pigs and lactating sows.

The main raw materials for producing and preparing GMOS at present are galactomannan gums, such as sesbania gum and the like. Sesbania gum is derived from the inner latex of sesbania seeds and has a chemical composition of galactomannan with a relative molecular mass of about 20 ten thousand Da. Contains a small amount of protein, is insoluble in various organic solvents, and is easily soluble in water. Sesbania gum glycan is a main chain formed by mannose units, galactose units form branched chains, and the ratio of galactose to mannose units is 1: 2. mannose units are connected through alpha-1, 4 glycosidic bonds, and galactose units are connected on mannose backbones through beta-1, 6 glycosidic bonds. The galactomannan oligosaccharide is produced and prepared by degrading sesbania gum with biological enzyme.

The carassius auratus gibelio is fed for 10 weeks by 120-tail carassius auratus gibelio, and the result shows that the weight gain rate and the specific growth rate of the carassius auratus gibelio juvenile can be obviously improved by adding 0.2 percent of GMOS into the basic feed. Reduce the bait coefficient and obviously improve the nonspecific immunity function of the fish body. In terms of the weight gain, the 0.1%, 0.2% and 0.3% groups were increased by 2.33, 30.0 and 18.1 percentage points, respectively, compared to the blank control group. In terms of specific growth rate, the 0.2% group and the 0.3% group are respectively improved by l9.8 and 9.5 percentage points compared with the blank control group; and the bait coefficient of the group with 0.1 percent, the group with 0.2 percent and the group with 0.3 percent are respectively reduced by 1.1 percent, 13.9 percent and 9.5 percent compared with the blank control group.

Test results show that GMOS can replace daily ration antibiotics (50mg/kg aureomycin and 40mg/kg salinomycin) of the broiler to a certain degree, and simultaneously can remarkably improve the titer level of serum newcastle disease antibodies, thereby enhancing the humoral and cellular immune functions of the broiler.

The result of 20 days of feeding 30 new zealand meat rabbits with the age of 50 days shows that compared with the control group added with 0.005% olaquindox, the survival rate of the rabbits of the test group added with 0.25% GMOS is improved by 7.5%, the feed-weight ratio and the diarrhea rate are reduced by 6.1% and 38.15%, and in addition, the total bore cleaning rate of the test group is improved by 2.22% compared with the control group measured after slaughter.

Research shows that GMOS has prevention effect on diarrhea caused by colibacillus and has better effect than chitosan oligosaccharide. GMOS can improve the growth potential of early weaned piglets at the age of 14 days, which is shown in that: can increase the concentration of insulin-like growth factor-1 (IGF-1) and growth hormone in serum and the expression level of IGF-1 in liver and eye muscle, thereby playing a role in promoting growth through mediation: GMOS can improve the immune function of early weaned piglets of 14 days old. The expression is as follows: improves the concentrations of IgG, IgA, IgM, IL-2, IL-6 and IL-1 beta immune factors in the piglet serum, and also improves the expression levels of the piglet peripheral blood mononuclear cell factors IL-1 beta, jejunal mucosa IL-1 beta and mesenteric lymph node IL-l beta genes, thereby enhancing the cellular immunity and the humoral immunity of the organism. Researches show that the feeding of GMOS with different concentrations can reduce the ileum microbial population quantity of early weaned piglets, inhibit harmful bacteria such as staphylococcus aureus, clostridium aeroginosum and the like, and promote the propagation of part of beneficial bacteria such as lactobacillus, bifidobacterium and the like; in colon, the number of colibacillus can be reduced, and the number of lactobacillus and bifidobacterium in colon can be obviously increased.

The 72-head 28-day-old weaned piglet test shows that the average daily feed intake and average daily gain can be obviously improved by adding 0.12% of GMOS in the daily ration, and the diarrhea incidence can be reduced. Experiments show that GMOS can completely replace aureomycin for feeding in 9.4-15 kg of piglet daily ration and can obtain better growth performance, but the effect on 15-27 kg of piglets is inferior to that of 75mg/kg of aureomycin.

45 Du multiplied by about binary pigs with the weight of 25.3 +/-2.3 kg are fed for 94 days, and the result shows that a certain proportion of yeast culture and GMOS are added into 25-90 kg of growing-finishing pig feed. Can improve daily gain, reduce material weight ratio, and reduce diarrhea rate. And good economic benefit and social benefit are obtained. The 0.10 percent GMOS is used for feeding the growing pigs for 96 days, and the result shows that compared with the method of adding the aureomycin with the concentration of 50mg/kg, the daily gain can be improved, the incidence rate of digestive tract diseases such as diarrhea and the like can be reduced, but the improvement effect on respiratory tract diseases such as asthma and the like is not realized; in the aspect of physiological and biochemical indexes of serum, GMOS has the tendency of reducing cholesterol and triglyceride in serum, can reduce the activities of glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase of serum to different degrees, plays roles of protecting liver, and can also obviously improve the content of GH and IL-2 in serum, thereby playing roles of promoting growth and improving immunity; in the aspect of slaughtering performance, GMOS has the tendency of reducing skin thickness, backfat thickness and eye muscle area and increasing lean meat percentage, and has little influence on straight carcass length, inclined carcass length and slaughtering rate; in the aspect of pork quality, GMOS can obviously reduce the content of indole in eye muscles, improve pork flavor and also has a trend of improving water retention capacity.

Tests show that when the nutrition level of the sow feed is the same and no antibiotic is added, compared with the group without the additive, the addition of the GMOS can obviously improve the lactation yield of the sow, reduce the feed-milk ratio and regulate the endocrine function of the sow; when antibiotics are added, GMOS can also increase the lactation yield of sows, reduce the feed-milk ratio, obviously improve the weaning individual weight of piglets, and has the improvement effect obviously better than that of a control group and kitasamycin and equivalent to virginiamycin; compared with a control group and 2 antibiotic groups, the galactomannan oligosaccharide group has the highest content of milk protein, and the average improvement amplitude reaches 14.9%.

The Chinese medicine preparation is rich in active components such as various polysaccharides, has obvious effect on improving the immunity and disease resistance of organisms, proves that hundreds of Chinese herbal medicines have various immunocompetences, such as the effects of promoting the growth and development of immune organs, enhancing the cellular immunity and humoral immunity of the organisms, promoting the generation of cell factors such as interferon-gamma, interleukin-2 and the like, and is green, safe and difficult to generate drug resistance. Therefore, the development and utilization of Chinese herbal medicines have become a hope.

Senkyunolide belongs to lactone compounds, mainly comprises senkyunolide A, senkyunolide H, senkyunolide I, senkyunolide D, senkyunolide F, senkyunolide J, senkyunolide M, senkyunolide Q and the like, has high content in Umbelliferae plants such as traditional Chinese medicines of rhizoma ligustici wallichii, angelica sinensis and the like, is a main active ingredient and a metabolic ingredient, and has various pharmacological activities. The senkyunolide compound has the pharmacological actions of resisting oxidative damage, resisting inflammation, relieving pain, resisting coagulation and platelet aggregation, relaxing blood vessel, resisting cell toxicity, etc.

After medicinal incubation is carried out on myocardial cells for 55min by adopting senkyunolide A, hypoxia is carried out for 2h, reoxygenation is carried out for 1h, Lactic Dehydrogenase (LDH) in supernate can be obviously reduced, the content of Malondialdehyde (MDA) is reduced, the activity of superoxide dismutase (SOD) is improved, and compared with a blank control group, the activity of Mitogen Activated Protein Kinase (MAPK) in the myocardial cells can be reduced, so that the senkyunolide A has a protection effect on hypoxia/reoxygenation injury of the myocardial cells of mice cultured in vitro, and meanwhile, MAPK signal conduction pathways can participate in the protection effect.

It is also reported in the literature that senkyunolide A pretreatment has a protective effect on hypoxia/reoxygenation (H/R) of heart microvascular endothelial cells, can obviously increase the survival number of the cells, increase the activities of NO and nitric oxide synthase (iNOS) in a cell culture solution, reduce the activity of endothelin, increase the expression quantity of iNOS mRNA and reduce the expression quantity of endothelin mRNA, and the action mechanism of the senkyunolide A pretreatment is probably related to the up-regulation of the expression of iNOS mRNA in the endothelial cells and the down-regulation of the expression of the endothelin mRNA. In addition, the Langedorff isolated heart perfusion method is adopted, and the heart is perfused by K-H perfusion liquid and senkyunolide A with different concentrations under the conditions of constant temperature and constant pressure. The result shows that the pretreatment of the senkyunolide A can improve the coronary flow of the rat in the isolated cardiac perfusion stopping and recharging period, and reduce the IL-1 beta concentration and TXB in the coronary effluent₂/6-Keto-PGF_1αThe ratio of (a) to (b), the incidence of ventricular tachycardia and ventricular fibrillation is reduced, and the duration is shortened; meanwhile, the contents of LDH and MDA in the myocardial homogenate are reduced, and the SOD activity is improved, which shows that the senkyunolide A pretreatment has a protective effect on vascular endothelial cell injury caused by rat isolated heart ischemia reperfusion.

The senkyunolide A has a certain relaxation effect on isolated aortic vessels of rats. To PGF_2αThe vasoconstriction induced by phenylephrine, 5-hydroxytryptamine and KC1 has inhibition effect, and the relaxation effect of adenosine monophosphate cyclase inhibitor, soluble guanylate cyclase inhibitor, non-selective potassium channel blocker tetraethyl amine and endothelium removal on the senkyunolide A has no obvious influence, and the specific action mechanism of the vasoconstriction is to be further researched.

Senkyunolide A has cytotoxicity to colon cancer cell HT-29, and can inhibit its cell proliferation, IC₅₀The concentration was (10.40. + -. 0.98). mu.g/mL. The survival inhibition of senkyunolide A on HT-29 is higher than that of normal colon cell CCD-18Co, and its IC is higher₅₀Is (20.95 +/-4.22) mu g/mL, and the senkyunolide A, the butylphthalide and the z-ligustilide have an integration effect on HT-29 cells and are dose-dependent in inhibiting colon cancer cells.

At present, no literature report that the galactomannan-oligosaccharide and the senkyunolide A are combined to be used as a piglet feed additive for regulating the intestinal flora is found.

Disclosure of Invention

The invention aims to provide a piglet feed additive which can effectively regulate intestinal flora and has low toxic and side effects.

The technical scheme adopted by the invention for solving the problems is to provide the feed additive for regulating the intestinal flora of the piglets, wherein the weight ratio of the galactomannan-oligosaccharide as an active component to the senkyunolide A is (10:1) - (1: 10).

Preferably, the weight ratio of the galactomannan-oligosaccharide to the senkyunolide A in the feed additive is (9:1) - (1: 1).

More preferably, the weight ratio of the galactomannan oligosaccharide to the senkyunolide A in the feed additive is (5:1) - (3: 1).

Most preferably, the weight ratio of the galactomannan-oligosaccharide to the senkyunolide A in the feed additive is 4: 1.

Preferably, the feed additive further comprises other active ingredients.

More preferably, the other active ingredients are selected from one or more of amino acids, vitamins, etc.

Most preferably, the amino acid is glycine, alanine, leucine, valine, cysteine, methionine, threonine, serine, phenylalanine, tyrosine, tryptophan, methionine, glutamic acid, arginine and/or histidine.

Most preferably, the vitamin is vitamin a, vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B12, vitamin C, vitamin D, vitamin E, vitamin H, vitamin K, and/or vitamin P.

The invention also provides an application of the feed additive in preparing a feed for regulating intestinal flora of piglets.

Preferably, the feed additive is contained in an amount of 1-5 wt% based on 100 parts by weight of the feed.

The invention has the positive and beneficial effects that:

surprisingly, the invention unexpectedly discovers that the combination of galactomannan oligosaccharide and senkyunolide A has synergistic effect on regulating intestinal flora of piglets, obviously reduces the dosage of active ingredients, and has better using effect when being matched with other active ingredients.

Compared with the common feed additive, the piglet feed additive has the advantages of simple preparation method, reasonable compatibility and obvious curative effect, and experiments prove that the piglet feed additive has good effect on adjusting intestinal flora of piglets; the additive has no western medicine components, so the feed additive has no toxic or side effect and no drug resistance.

Detailed Description

The present invention will be further described with reference to the following examples, but the embodiments of the present invention are not limited thereto. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.

Example 1 preparation of feed additive

Mixing galactomannan oligosaccharide 9 weight parts and senkyunolide A1 weight parts to obtain feed additive S1 with the weight ratio of galactomannan oligosaccharide to senkyunolide A being 9: 1.

Mixing galactomannan oligosaccharide 5 weight parts and senkyunolide A5 weight parts, and making into feed additive S2 with a weight ratio of galactomannan oligosaccharide to senkyunolide A of 1: 1.

Mixing galactomannan oligosaccharide 8 weight parts and senkyunolide A2 weight parts to obtain feed additive S3 with the weight ratio of galactomannan oligosaccharide to senkyunolide A being 4: 1.

Example 2 application of the feed additive in adjusting intestinal flora of weaned pigs

1. Test animals and group treatment

120 weaned piglets of 28-day-old weaned pigs are selected and subjected to durox (Changbai X Dabai) ternary hybridization, all the boars are castrated, and are immediately divided into 6 groups according to the principle that the weight, the sex and the blood relationship are consistent, namely composition groups 1-3 (the feed additive S1-S3 prepared in the embodiment 1), galactomannan oligosaccharide groups, senkyunolide A groups and control groups, and 20 piglets are selected. The feed additive is added into the ration of the S1-S3 composition group, the galactomannan oligosaccharide group and the senkyunolide A group according to 1 percent of the total weight of the feed (the total weight of the active ingredients added into each group is the same), the ration of the control group is the pig feed with the same weight without the feed additive, each group of piglets is fed for 3 times every day, the piglets are fed freely in the experimental period and provided with sufficient drinking water, other daily management measures are carried out according to the conventional management of a farm, the immunization and the insect repelling are carried out regularly, and the experimental period is 30 days.

2. Intestinal flora determination

After the test is finished, the piglets of each test group are slaughtered, immediately subjected to laparotomy and ligation, colon segments are taken out, sterilized by alcohol cotton balls, placed into sterilized plastic bags, and transported to a microecology laboratory to detect the number of escherichia coli, lactobacillus and bifidobacterium.

Culture medium: escherichia coli was cultured in eosin-methylene blue medium (EMB), Lactobacillus was cultured in MRS, and Bifidobacterium was cultured in BLb.

Counting: the bacteria were counted using a plate coating method. Diluting with sterilized normal saline to 10 times^-1、10^-2、10^-3---Up to 10^-8Then, 0.02m1 of the dilution was sampled from the start of the high dilution by a micro-sampler and dropped into each selective medium at three dilutions (10 for E.coli selection)^-4、10^-5、10^-6(ii) a Lactobacillus selection 10^-5、10^-6、10^-7(ii) a Bifidobacterium selection of 10^-5、10^-6、10^-7) Triplicates were made for each dilution and averaged. After inoculation, the mixture is pushed evenly by a glass bending rod, escherichia coli is cultured for 24 hours in an aerobic mode, and lactobacillus and bifidobacterium are cultured for 48 hours in an anaerobic mode, and then the number of the escherichia coli, the lactobacillus and the bifidobacterium is counted respectively. The results are expressed as the usual log value of cfu (logcfu).

3. Test results

The effect of the feed additives on the intestinal flora of weaned piglets in each test group is shown in table 1.

TABLE 1 Effect of the feed supplement of the invention on the intestinal flora of weaned piglets (logcfu/g intestinal content)

From example 2, it can be seen that the feed additive of the present invention can significantly reduce the number of escherichia coli in intestinal flora of piglets and increase the number of lactobacillus and bifidobacterium compared to the control group, and is an excellent-effect regulator of intestinal flora of piglets. Particularly, the combined use of the galactomannan-oligosaccharide and the senkyunolide A produces a synergistic effect and reduces the use amount of the medicament, wherein the feed additive with the weight ratio of the galactomannan-oligosaccharide to the senkyunolide A of 4:1 has the most remarkable effect and produces excellent effect which is difficult to expect.

Claims

1. A feed additive capable of regulating intestinal flora of piglets is characterized in that the weight ratio of galactomannan-oligosaccharide and senkyunolide A serving as active ingredients is (9:1) - (1: 1).

2. The feed additive according to claim 1, wherein the weight ratio of galactomannan-oligosaccharide to senkyunolide A is (5:1) - (3: 1).

3. The feed additive of claim 1, wherein the feed additive further comprises other active ingredients.

4. The feed additive according to claim 3, wherein the other active ingredients are selected from one or both of amino acids and vitamins.

5. The feed additive according to claim 4, wherein the amino acid is selected from glycine, alanine, leucine, valine, cysteine, methionine, threonine, serine, phenylalanine, tyrosine, tryptophan, methionine, glutamic acid, arginine and/or histidine and the vitamin is selected from vitamin A, vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B12, vitamin C, vitamin D, vitamin E, vitamin H, vitamin K and/or vitamin P.

6. Use of a feed additive according to any one of claims 1 to 5 for the preparation of a feed for the regulation of the intestinal flora of piglets.

7. Use according to claim 6, characterized in that the feed additive is present in an amount of 1-5% by weight per 100 parts by weight of feed.