CN110140818A - A kind of sustained release protein feed - Google Patents
A kind of sustained release protein feed Download PDFInfo
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- CN110140818A CN110140818A CN201910510344.XA CN201910510344A CN110140818A CN 110140818 A CN110140818 A CN 110140818A CN 201910510344 A CN201910510344 A CN 201910510344A CN 110140818 A CN110140818 A CN 110140818A
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- protein feed
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K10/00—Animal feeding-stuffs
- A23K10/30—Animal feeding-stuffs from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms
- A23K10/37—Animal feeding-stuffs from material of plant origin, e.g. roots, seeds or hay; from material of fungal origin, e.g. mushrooms from waste material
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/158—Fatty acids; Fats; Products containing oils or fats
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/163—Sugars; Polysaccharides
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/20—Inorganic substances, e.g. oligoelements
- A23K20/28—Silicates, e.g. perlites, zeolites or bentonites
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/20—Inorganic substances, e.g. oligoelements
- A23K20/30—Oligoelements
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K40/00—Shaping or working-up of animal feeding-stuffs
- A23K40/10—Shaping or working-up of animal feeding-stuffs by agglomeration; by granulation, e.g. making powders
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K50/00—Feeding-stuffs specially adapted for particular animals
- A23K50/10—Feeding-stuffs specially adapted for particular animals for ruminants
- A23K50/15—Feeding-stuffs specially adapted for particular animals for ruminants containing substances which are metabolically converted to proteins, e.g. ammonium salts or urea
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/87—Re-use of by-products of food processing for fodder production
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- Life Sciences & Earth Sciences (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Food Science & Technology (AREA)
- Animal Husbandry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Botany (AREA)
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- Feed For Specific Animals (AREA)
Abstract
The invention discloses a kind of sustained release protein feeds, are made of following component: expanded urea 55.0 ~ 75.0%, sodium carboxymethylcellulose 2.0 ~ 6.0%, thin powdered rice hulls 8.0 ~ 12.0%, palm oil fatty powder 5.0 ~ 12.0%, thin zeolite powder 3.0 ~ 6.0%, composite trace element 0.10 ~ 1.5%；Preparation method includes: to be added water as after raw material and mass fraction proportion, be tuned into moist delay shape；Squeeze granulation；It air-dries, cooling, adjustment moisture content is 7 ~ 11%；Protein feed of the present invention, it is tumor in-stomach floating type sustained-release particle, in water and rumen fluid both liquid, 80% or more floats on liquid level, solution rate is slow, the non-nitrogen component rate of release that finished product includes is significantly lower than similar product, and release time 3-4 hour extended in cud reaches real slow release effect, is conducive to the utilization of carbon nitrogen synchronous release；It directly can proportionally be added when pasture makes TMR.
Description
Technical field
The invention belongs to technical field of animal, and in particular to a kind of sustained release albumen feeding that can be floated in rumen fluid
Material.
Background technique
Protein feed resource shortage is always to restrict one of the bottleneck problem of Chinese Feed Industrial healthy and stable development.
Sustained-release non-protein nitrogen is coated with sustained release processing by carrying out special chelating to nonprotein nitrogen, makes urea analog derivative
Roughage swims in rumen fluid upper layer, on the one hand hydrolyzes ammonia release slowly, ammonia density is relative constant, on the other hand with ruminating
Occur, coated sustained release protein feed is destroyed after ruminating in company with roughage, as that ruminates be released, is
This carry out speed ruminated is exactly the speed of sustained-release non-protein nitrogen release, and the ammonia density that can be floated in rumen fluid is relatively permanent
It is fixed, low concentration state is maintained, microbial fermentation decomposition is easy to, suitable condition is provided for rumen microorganism growth, to reach
To the purpose of effective use.
It is mostly at present nonprotein nitrogen class, product for its main component of the sustained release protein feed of ruminant on feed market
Form is substantially in the majority with plastered starch urea, adds use in smart supplementary feeding material by a certain percentage, but the addition of this part
Nonprotein nitrogen does not reach effective slow release effect, after entering in ruminant tumor gastric, discharges rapidly in a short time, very
It is rapidly increased it is possible that will cause animal body ammonia concentration, the function of ruminant tumor gastric and entire body is influenced, when serious
It will cause animal body ammonia poisoning, once discovery, treatment even will cause animal dead not in time.In addition ruminant eats
Albumen cannot be used directly and cause the utilization rate of feed low, cause to waste, also constrain aquaculture development.
Based on the technical deficiency of existing market sustained release protein product, urgent need is developed one kind and can be played in ruminant tumor gastric
The product of real slow release effect.
Summary of the invention
Object of the present invention is to solve the problems, such as that existing sustained release protein feed causes animal ammonia poisoning and utilization rate is low, and mention
For a kind of sustained release protein feed.
A kind of sustained release protein feed is made of following component as mass fraction:
Expanded urea 55.0 ~ 75.0%,
Sodium carboxymethylcellulose 2.0 ~ 6.0%,
Thin powdered rice hulls 8.0 ~ 12.0%,
Palm oil fatty powder 5.0 ~ 12.0%,
Thin zeolite powder 3.0 ~ 6.0%,
Composite trace element 0.10 ~ 1.50%；
It is the expanded urea 65.0%, sodium carboxymethylcellulose 6.0%, thin powdered rice hulls 12.0%, palm oil fatty powder 12.0%, thin
Zeolite powder 4.0%, composite trace element 1.0%；
It is the expanded urea 70.0%, sodium carboxymethylcellulose 5.0%, thin powdered rice hulls 10.0%, palm oil fatty powder 9.0%, thin
Zeolite powder 5.0%, composite trace element 1.0%；
The expanded urea 75.0%, sodium carboxymethylcellulose 5.0%, thin powdered rice hulls 8.0%, palm oil fatty powder 8.0%, thin boiling
Mountain flour 3.0%, composite trace element 1.0%；
The powdered rice hulls, being crushed to mesh number is 80 ~ 100 mesh；
The thin zeolite powder is 180 ~ 220 mesh；
The expanded urea, is prepared by the following method:
1) urea for being 150 ~ 200% by crude protein content crushes；
2) smashed urea and powdered rice hulls are mixed by 7 ~ 5:3 ~ 5, and slabbing is squeezed at 70 ~ 80 DEG C, cooling, it is crushed to 30 ~
50 mesh.
A kind of preparation method being sustained protein feed, it includes:
1) after by a kind of raw material of sustained release protein feed and mass fraction proportion, add water, be tuned into moist delay shape；
2) granulation is squeezed；
3) it air-dries, cooling, adjustment moisture content is 7 ~ 11%；
The granulation of extruding described in step 2 is the mold with 4 ~ 6 millimeters of diameter, granulation is squeezed under 3 ~ 5 kilograms of states of pressure；
It is air-dried described in step 3) countercurrently to air-dry.
The present invention provides a kind of sustained release protein feeds, are made of following component: expanded urea 55.0 ~ 75.0%, carboxymethyl
Sodium cellulosate 2.0 ~ 6.0%, palm oil fatty powder 5.0 ~ 12.0%, thin zeolite powder 3.0 ~ 6.0%, is answered at thin powdered rice hulls 8.0 ~ 12.0%
Close microelement 0.10 ~ 1.5%；Preparation method includes: to be added water as after raw material and mass fraction proportion, be tuned into moist delay shape；
Squeeze granulation；It air-dries, cooling, adjustment moisture content is 7 ~ 11%；Protein feed of the present invention is tumor in-stomach floating type sustained-release particle,
In water and rumen fluid both liquid, 80% or more is floated on liquid level, and solution rate is slow, and the non-nitrogen component that finished product includes is released
Speed is put significantly lower than similar product, release time 3-4 hour extended in cud reaches real slow release effect, is conducive to carbon
Nitrogen synchronous release utilizes；It directly can proportionally be added when pasture makes TMR.
Detailed description of the invention
The absolute release rate result of 5 kinds of samples of Fig. 1 different time points in water；
The urea concentration result of 5 kinds of samples of Fig. 2 different time points in water；
Absolute release rate result of the 5 kinds of samples of Fig. 3 different time points in rumen fluid；
Urea concentration result of the 5 kinds of samples of Fig. 4 different time points in rumen fluid；
The floating state result of 5 kinds of samples of Fig. 5 different time points in water；
Floating state result of the 5 kinds of samples of Fig. 6 different time points in rumen fluid.
Specific embodiment
A kind of sustained release protein feed of embodiment 1
A kind of sustained release protein feed, as mass fraction, it is made of following component: 70.0% expanded urea, 5.0% carboxymethyl are fine
Tie up plain sodium, 10.0% thin powdered rice hulls, 9.0% palm oil fatty powder, 5.0% thin zeolite powder, 1.0% composite trace element；
The powdered rice hulls, being crushed to mesh number is 80 mesh or more；
The thin zeolite powder is 200 mesh；
The composite trace element is smashed raw material；
The expanded urea, is prepared by the following method:
1) urea for being 150 ~ 200% by crude protein content crushes；
2) smashed urea and straw powder are mixed by 7 ︰ 3, and slabbing is squeezed at 70 ~ 80 DEG C, cooling, are crushed to 40 mesh.
A kind of sustained release protein feed of embodiment 2
A kind of sustained release protein feed, as mass fraction, it is made of following component: 75.0% expanded urea, 5.0% carboxymethyl are fine
Tie up plain sodium, 8.0% thin powdered rice hulls, 8.0% palm oil fatty powder, 3.0% thin zeolite powder, 1.0% composite trace element；
The powdered rice hulls, being crushed to mesh number is 80 mesh or more；
The thin zeolite powder is 200 mesh；
The composite trace element is smashed raw material；
The expanded urea, is prepared by the following method:
1) urea for being 150 ~ 200% by crude protein content crushes；
2) smashed urea and straw powder are mixed by 1:1, and slabbing is squeezed at 70 ~ 80 DEG C, cooling, are crushed to 40 mesh.
A kind of sustained release protein feed of embodiment 3
A kind of sustained release protein feed, as mass fraction, it is made of following component: 65.0% expanded urea, 6.0% carboxymethyl are fine
Tie up plain sodium, 12.0% thin powdered rice hulls, 12.0% palm oil fatty powder, 4.0% thin zeolite powder, 1.0% composite trace element；
The powdered rice hulls, being crushed to mesh number is 80 mesh or more；
The thin zeolite powder is 200 mesh；
The composite trace element is smashed raw material；
The expanded urea, is prepared by the following method:
1) urea for being 150 ~ 200% by crude protein content crushes；
2) smashed urea and powdered rice hulls are mixed by 3:2, and slabbing is squeezed at 70 ~ 80 DEG C, cooling, are crushed to 40 mesh.
A kind of preparation for being sustained protein feed of embodiment 4
A kind of preparation method being sustained protein feed, it includes:
1) after by above-mentioned raw materials and mass fraction proportion, clean water is added and is tuned into moist delay shape；
2) mold for using 4 ~ 6 millimeters of diameter, squeezes granulation under 3 ~ 5 kilograms of states of pressure, and shape is 4 ~ 6 millimeters × 6 ~ 8 millimeters；
3) it is 7 ~ 11% that adverse current, which air-dries and is cooled to moisture content,.
Embodiment 5 is sustained the experiment of protein feed release
One, release is tested in water
Using feed described in embodiment 1-3 as laboratory sample (number 1,2,3), with commercially available sustained release protein feed 1, commercially available sustained release
Protein feed 2 is control, and every kind of sample weighs 1.0g, is respectively put into conical flask, is added 100ml pure water (water pH6.6), puts
Enter in shaking bath, shaking table parameter setting is 39 DEG C, 100rpm, is sampled every 10min, 0.5mL is drawn with liquid-transfering gun, with light splitting
Photometer measuring method measures solubility urea content in solution；Overall result is as shown in table 1.
5 kinds of samples of different time points absolute release rate in water is as shown in Figure 1, in 60min, and absolute release rate is from big
To it is small successively are as follows: commercially available sustained release protein feed 2 > No. 2 > No. 1 > sustained release protein feed 1 > 3 commercially available, overall releasing trend be all in by
Gradually rise, until there is no decelerating trend when 60min.The urea concentration of 5 kinds of samples of different time points in water is shown in Fig. 2, in No. 1 sample
Contained urea content is 50.70%, and No. 2 are 55.88%, and No. 3 are 34.80%, and in 60min, urea concentration is from big to small successively
Are as follows: commercially available sustained release protein feed 2 > sustained release protein feed 1 > No. 2 > No. 1 > No. 3 commercially available.
Two, release is tested in rumen fluid
Using feed described in embodiment 1-3 as laboratory sample (number 1,2,3), with commercially available sustained release protein feed 1, commercially available sustained release
Protein feed 2 is control, and every kind of sample weighs 1.0g, is respectively put into conical flask, and 100ml rumen fluid is added, is put into water-bath and shakes
In bed, shaking table parameter setting is 39 DEG C, 100rpm, is sampled every 10min, draws 0.5mL with liquid-transfering gun, uses spectrophotometer
Method measures solubility urea content in solution；Overall result is as shown in table 2.
Absolute release rate of the 5 kinds of samples of different time points in rumen fluid is as shown in figure 3, in 60min, absolute release rate
From big to small successively are as follows: commercially available sustained release protein feed 2 > 2 > commercially available sustained release protein feed 1≤No. 1 > No. 3, commercially available sustained release albumen
Feed 1 and No. 1 trend is slightly overlapped；Urea concentration of the 5 kinds of samples of different time points in rumen fluid is as shown in figure 4, in 60min
When, the commercially available sustained release protein feed of urea concentration 2 in rumen fluid > sustained release protein feed 1 > No. 2 > No. 1 > No. 3 commercially available, with class in water
Seemingly.
In summary for result it is found that the rate of release of No. 3 samples is slower, slow release effect is more preferable.
Embodiment 6 is sustained the experiment of protein feed floating state
One, water float state is tested
Using feed described in embodiment 1-3 as laboratory sample (number 1,2,3), with commercially available sustained release protein feed 1, commercially available sustained release
Protein feed 2 is control, and 5 kinds of samples are put into respectively in the conical flask equipped with water, observation 0min, 30min, 60min sample
State records result and analyzes (Fig. 5)；By observation, No. 1 sample 20min starts to sink, and No. 2 sample 30min start to sink, and 3
The phenomenon that number sample 15min starts to sink, and commercially available sustained release protein feed 1 and commercially available sustained release protein feed 2 are presented is from sinking to the bottom shape
State gradually floats up；Fig. 5 the result shows that, just into the water when, No. 1, No. 2, No. 3 samples all bubble through the water column, commercially available sustained release egg
White feed 1 and commercially available sustained release protein feed 2 are then sunken in water；No. 1 when 30min, No. 2, No. 3 samples be all sunken in water, it is commercially available slow
Releasing protein feed 1 and drifting along all has, commercially available 2 almost all of sustained release protein feed floating；No. 1 when 60min, No. 2, No. 3 samples it is all heavy
Yu Shuili, commercially available sustained release protein feed 1 and the floating of commercially available 2 almost all of sustained release protein feed；It is taken out after 60min and acutely rocks hair
Existing, the commercially available sink-float of sustained release protein feed 1 all has, and does not rock then state as shown acutely；3 when in figure it can also be seen that 60min
The water of number sample is limpider, transparency is more preferable, it was demonstrated that No. 3 samples have the characteristic not readily dissolved.
Two, floating state is tested in rumen fluid
Using feed described in embodiment 1-3 as laboratory sample (number 1,2,3), with commercially available sustained release protein feed 1, commercially available sustained release
Protein feed 2 is control, and 5 kinds of samples are put into respectively in the conical flask equipped with water, observation 0min, 30min, 60min sample
State records result；Just in investment rumen fluid, 1,2, No. 3 sample all floats on rumen fluid, until rumen fluid is still floated on when 30min,
60min all samples sink to bottom (No. 1 is all sunk to liquid level for average 40 minutes, and No. 2 are all sunk to liquid level for average 45 minutes, 3
Number all sink to liquid level within average 30 minutes)；Commercially available sustained release protein feed 1 is most of to be sunken to rumen fluid, commercially available sustained release protein feed 2
A part is sunken to rumen fluid, and a part floats on rumen fluid.
Comprehensively consider in water with floating state experimental result in rumen fluid it is found that No. 3 sample effects are more preferable.
The measurement of 7 nutrient content of embodiment
According to embodiment 5 and 6 as a result, knowing that the feed formula effect of No. 3 samples is more preferable.Nutrient content is further determined,
As a result as shown in table 3 below.
Protein feed of the invention, in water and rumen fluid both liquid, 80% or more is floated on liquid level, solution rate
Slowly, the non-nitrogen component rate of release that finished product includes is significantly lower than similar product.
Claims (10)
1. a kind of sustained release protein feed, as mass fraction, including following component:
Expanded urea 55.0 ~ 75.0%, sodium carboxymethylcellulose 2.0 ~ 6.0%, thin powdered rice hulls 8.0 ~ 12.0%,
Palm oil fatty powder 5.0 ~ 12.0%, thin zeolite powder 3.0 ~ 6.0%.
2. a kind of sustained release protein feed according to claim 1, it is characterised in that: the expanded urea 65.0%, carboxylic first
Base sodium cellulosate 6.0%, thin powdered rice hulls 12.0%, palm oil fatty powder 12.0%, thin zeolite powder 4.0%.
3. a kind of sustained release protein feed according to claim 1, it is characterised in that: the expanded urea 70.0%, carboxylic first
Base sodium cellulosate 5.0%, thin powdered rice hulls 10.0%, palm oil fatty powder 9.0%, thin zeolite powder 5.0%.
4. a kind of sustained release protein feed according to claim 1, it is characterised in that: the expanded urea 75.0%, carboxylic first
Base sodium cellulosate 5.0%, thin powdered rice hulls 8.0%, palm oil fatty powder 8.0%, thin zeolite powder 3.0%.
5. a kind of sustained release protein feed according to claim 1,2,3 or 4, it is characterised in that: the powdered rice hulls are crushed to
Mesh number is 80 ~ 100 mesh, further includes composite trace element 1.0% in the component.
6. a kind of sustained release protein feed according to claim 5, it is characterised in that: the thin zeolite powder is 180 ~ 220 mesh.
7. a kind of sustained release protein feed according to claim 6, it is characterised in that: the expanded urea is by following
Method preparation:
1) urea for being 150 ~ 200% by crude protein content crushes；
2) smashed urea and straw powder are mixed by 7 ~ 5:3 ~ 5, and slabbing is squeezed at 70 ~ 80 DEG C, cooling, it is crushed to 30 ~
50 mesh.
8. a kind of preparation method for being sustained protein feed, it includes:
1) after a kind of raw material for being sustained protein feed and mass fraction according to claim 1 match, add water, be tuned into moist stagnant
Stay shape；
2) granulation is squeezed；
3) it air-dries, cooling, adjustment moisture content is 7 ~ 11%.
9. a kind of preparation method for being sustained protein feed according to claim 8, it is characterised in that: squeezed described in step 2
Grain is suppressed, is the mold with 4 ~ 6 millimeters of diameter, granulation is squeezed under pressure 3 ~ 5MPa state.
10. a kind of preparation method for being sustained protein feed according to claim 9, it is characterised in that: described in step 3)
It air-dries countercurrently to air-dry.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910510344.XA CN110140818A (en) | 2019-06-13 | 2019-06-13 | A kind of sustained release protein feed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910510344.XA CN110140818A (en) | 2019-06-13 | 2019-06-13 | A kind of sustained release protein feed |
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| CN110140818A true CN110140818A (en) | 2019-08-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111296626A (en) * | 2020-04-16 | 2020-06-19 | 吴军化 | Preparation of cattle feed additive with biological activity |
| CN112335791A (en) * | 2020-10-26 | 2021-02-09 | 刘吉生 | Biological regulation and control release type urea compound and preparation method thereof |
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|---|---|---|---|---|
| CN1194792A (en) * | 1997-12-27 | 1998-10-07 | 中国科学院黑龙江农业现代化研究所 | Slow-released granular feed for ruminant |
| CN104509696A (en) * | 2013-09-27 | 2015-04-15 | 任白宝 | Cattle and sheep feed additive and production method thereof |
| CN104705535A (en) * | 2013-12-11 | 2015-06-17 | 上海美农生物科技股份有限公司 | Sustain-released urea for producing feed and preparation method thereof |
| CN106359959A (en) * | 2016-09-30 | 2017-02-01 | 山西省农业科学院畜牧兽医研究所 | Non-protein nitrogen feed additive and application thereof |
| CN108617863A (en) * | 2018-03-29 | 2018-10-09 | 浙江耀飞生物科技有限公司 | A kind of aliphatic acid coated slow-release urea and preparation method |
-
2019
- 2019-06-13 CN CN201910510344.XA patent/CN110140818A/en active Pending
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|---|---|---|---|---|
| CN1194792A (en) * | 1997-12-27 | 1998-10-07 | 中国科学院黑龙江农业现代化研究所 | Slow-released granular feed for ruminant |
| CN104509696A (en) * | 2013-09-27 | 2015-04-15 | 任白宝 | Cattle and sheep feed additive and production method thereof |
| CN104705535A (en) * | 2013-12-11 | 2015-06-17 | 上海美农生物科技股份有限公司 | Sustain-released urea for producing feed and preparation method thereof |
| CN106359959A (en) * | 2016-09-30 | 2017-02-01 | 山西省农业科学院畜牧兽医研究所 | Non-protein nitrogen feed additive and application thereof |
| CN108617863A (en) * | 2018-03-29 | 2018-10-09 | 浙江耀飞生物科技有限公司 | A kind of aliphatic acid coated slow-release urea and preparation method |
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| Title |
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| 王玉琴 等: "《种草养羊技术手册》", 31 December 2010 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111296626A (en) * | 2020-04-16 | 2020-06-19 | 吴军化 | Preparation of cattle feed additive with biological activity |
| CN112335791A (en) * | 2020-10-26 | 2021-02-09 | 刘吉生 | Biological regulation and control release type urea compound and preparation method thereof |
| CN112335791B (en) * | 2020-10-26 | 2023-12-08 | 刘吉生 | Biological controlled release urea compound and preparation method thereof |
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