CN105166418A - Anti-heat stress feed additives for rabbits and preparation method thereof - Google Patents
Anti-heat stress feed additives for rabbits and preparation method thereof Download PDFInfo
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Abstract
The invention aims at providing anti-heat stress feed additives for rabbits and a preparation method thereof. Therefore, a heat stress response of rabbits in high-temperature environments in summer is relieved, feed intake, daily gain and feed conversion are increased, the death rate is decreased, and the cost of breeding the rabbits is reduced. According to the technical scheme, the anti-heat stress feed additives for the rabbits are characterized by being prepared from, by weight, 20-50 parts of honeysuckles, 20-50 parts of spreading hedyotis herbs, 20-50 parts of milkvetch roots, 15-30 parts of coptidis rhizoma, 10-40 parts of rhizoma atractylodis macrocephalae, 10-30 parts of herba moslae, 10-30 parts of reed rhizome, 20-50 parts of cortex lycii, 10-30 parts of mesona, 20-50 parts of burdock, 10-40 parts of hawthorns, 10-30 parts Chinese magnoliavine fruits, 20-40 parts of betaine, 50-80 parts of glutamine and 5-15 parts of feed grade organic chromium.
Description
Technical field
The invention belongs to feed additive field, relate to a kind of feed addictive and preparation method thereof, that be specifically related to is a kind of rabbit anti-heat stress feed additive and preparation method.
Background technology
At high temperature season, rabbit suffers heat stress.Heat stress refers to that animal body is for being unfavorable for the summation that the nonspecific response that its physiological high ambient temperature produces reacts.The normal temperature of rabbit is 38.3 ~ 39.5 DEG C, and the bodily form is little, and metabolism is vigorous, and in body, heat production is many, and simultaneously its fur is thicker, and sweat gland is less, thus rabbit very To Be Protected from Heat.Along with the continuous aggravation of global climate greenhouse effects, the annual summer high temperature weather of China's most area, for up to 3 ~ 4 months, makes rabbit occur obvious heat stress.Heat stress makes rabbit feed intake reduce, and body temperature raises, and endotrophic storage constantly consumes, and causes production performance, immunity to reduce even dead, causes serious economic loss to rabbit keeping.Therefore, seeking the technical measures alleviating rabbit heat stress is one of vital tasks of rabbit keeping.Rabbit increases to the optimum temperature of environmental requirement with body weight and monthly age and declines.When environment temperature is higher than its upper critical temperature, the feed intake of rabbit reduces.The rabbit monthly age is different with body condition, and the degree of its feed intake temperature influence is also different.The monthly age surface area per unit volume of little or thin and weak rabbit is long-pending large, and the rabbit large or fatter than the monthly age can scatter and disappear more heat.During rabbit generation heat stress, Nutrient Absorption process is obstructed, and is: peripheral vasodilation to the key reaction of high temperature, and CBF increases, and enters internal blood vessel such as genital tract and GI CBF simultaneously and reduces.Therefore, under high temperature, rabbit reduces the uptake of nutrient.Zhou Ming etc. (1997) report, when animal is by heat stress, intestinal motility weakens, and chyme is emptying to slow down, Nutrient Absorption process obstacle, thus causes its body each side function all to decline.
During rabbit heat stress, water requirement increases, and can reach several times by the potassium amount of losing in skin, in body, the loss amount of sodium, magnesium, calcium, chlorine also obviously increases.These mineral loss amounts and amount of sweat have significant correlation, generally have more the negative balance of existing nitrogen.High temperature can to make in Animal Liver the vitamin reserves such as vitamin A reduce.
Large quantity research shows, when body temperature raises, thyroid gland function reduces, and thyroid volume diminishes, atrophy.This is mainly in order to reduce the basic metabolism in body, reduces the generation of body heat.Heat stress makes thyroxine secretion amount reduce.The thyroxine of safe dose can promote the synthesis of protein, puts on weight.During heat stress, in blood, thyroid hormones level reduces, and suppresses metabolism, reduces heat production, maintains heat production and heat dissipation balancing.
Under rabbit is in hot environment, peripheral nerve imports central nervous system into thermostimulation, hypothalamus secretion corticoliberim, act on adenohypophysis, make it to secrete corticotropin, be recycled to adrenal gland through blood, cortex hormone of aadrenaline is synthesized and burst size increase, Blood cortisol concentration raises.Adrenal gland activity strengthens, and the secretory volume of adrenaline and cortin increases.This is a kind of defensive reaction that body deals with poor environment.The secretory volume of cortisol increases, to regulate the metabolism of salt, sugar, protein and fat.The function of adrenal cortex alcohol improves the resistance of body, strengthens humoral immune reaction, improves tolerance and the adaptability of body.Meanwhile, cortisol secretion amount increases, and breaks down proteins is accelerated, and the synthesis of CKIs matter, thus make Body weight loss.
Heat stress can make some biochemical parameters of body change, the especially change of enzyme level.Zhu Guobiao etc. (1994) report, the power consumption of heat stress Cardiac Muscle of Rats cell increases, and energy substance reserves reduce, Mitochondria level declines, thus causing ATP synthetic quantity to reduce, myocardial cell membrane increases the permeability of nitrate, and in film, irregularities distributed granule increases.
The heat stress alleviating rabbit is not single technical measures.Many researchers proposes to adopt breeding, measure such as reinforcement feeding and management and nutrition regulation etc. solves.Wherein, nutrition regulation is a very important measure.There is a lot of research reports in this respect.
Strengthening feeding and management as added forced ventilation, still can not reduce house temperature as depended merely on door window gravity-flow ventilation, can force ventilation be taked, air inlet or gable install blower fan, hanging wet straw screen or mat etc.Because the sweat gland of rabbit is undeveloped, thus give up warm too high time, can to wall, rabbit body spray, discourage earthward, sports ground or house in build bathing pool etc.Nutrition regulation be it is generally acknowledged, should give rabbit diet higher energy at high temperature season, makes up the Energy intaking that Yin Gaowen causes not enough with this.
At present, in feeding and management, many employing transformation rabbit homes, the modes such as forced ventilation, reduction stocking density or the wet curtain of employing that add are lowered the temperature, and feeding cost is higher.The present invention by adding anti-heat stress feed additive in rabbit feed, has that cost is low, easy to use, effective, culture benefit advantages of higher, is the effective ways alleviating rabbit heat stress in summer.
But in prior art, there is no special rabbit anti-heat stress feed additive, mostly be take other Heat stress feeds slightly to change namely to use, or rely on some simple formulation of application experience of other poultrys, when for rabbit cultivation in enormous quantities, how these methods cannot prove its validity, and whether can ensure rabbit normal growth only in hot summer, validity all cannot confirm.Prior art needs effective rabbit anti-heat stress feed additive badly.
Summary of the invention
The object of this invention is to provide a kind of rabbit anti-heat stress feed additive, alleviate the physiological responses to heat stress of rabbit in summer high temperature environment, improve the feed intake of rabbit, daily gain and the price of deed, reduce the death rate, reduce and support rabbit cost summer.And a kind of method preparing above-mentioned anti-heat stress feed additive is provided.
For achieving the above object, the technical solution used in the present invention is:
A kind of rabbit anti-heat stress feed additive, is characterized in that: composition comprises honeysuckle 20-50 weight portion, oldenlandia diffusa 20-50 weight portion, Radix Astragali 20-50 weight portion, coptis 15-30 weight portion, bighead atractylodes rhizome 10-40 weight portion, elscholtiza 10-30 weight portion, reed rhizome 10-30 weight portion, root bark of Chinese wolf-berry 20-50 weight portion, celestial careless 10-30 weight portion, burdock 20-50 weight portion, hawthorn 10-40 weight portion, fruit of Chinese magnoliavine 10-30 weight portion, betaine 20-40 weight portion, glutamine 50-80 weight portion, feed grade Organic Chromium 5-15 weight portion.
Aforesaid rabbit anti-heat stress feed additive, is characterized in that: honeysuckle 25-35 weight portion, oldenlandia diffusa 25-35 weight portion, Radix Astragali 25-35 weight portion, coptis 15-25 weight portion, bighead atractylodes rhizome 25-35 weight portion, elscholtiza 15-25 weight portion, reed rhizome 15-25 weight portion, root bark of Chinese wolf-berry 25-35 weight portion, celestial careless 15-25 weight portion, burdock 35-45 weight portion, hawthorn 25-35 weight portion, fruit of Chinese magnoliavine 15-25 weight portion, betaine 25-35 weight portion, glutamine 55-65 weight portion, feed grade Organic Chromium 8-12 weight portion.
Aforesaid rabbit anti-heat stress feed additive, is characterized in that: composition comprises honeysuckle 30 weight portion, oldenlandia diffusa 30 weight portion, the Radix Astragali 30 weight portion, the coptis 20 weight portion, the bighead atractylodes rhizome 30 weight portion, elscholtiza 20 weight portion, reed rhizome 20 weight portion, the root bark of Chinese wolf-berry 30 weight portion, celestial careless 20 weight portions, burdock 40 weight portion, hawthorn 30 weight portion, the fruit of Chinese magnoliavine 20 weight portion, betaine 30 weight portion, glutamine 60 weight portion, feed grade Organic Chromium 10 weight portion.
Aforesaid rabbit anti-heat stress feed additive, is characterized in that: described betaine is for adding natural betaine, wherein content >=97% mass fraction of betaine compound.
Aforesaid rabbit anti-heat stress feed additive, is characterized in that: feed grade Organic Chromium is any one or wherein several mixtures in chromium methionine, yeast chromium, chromium picolinate, chromium picolinate, nicotinate chromium.
The preparation method of aforesaid rabbit anti-heat stress feed additive, it is characterized in that: 1) take honeysuckle, oldenlandia diffusa, the Radix Astragali, the coptis, the bighead atractylodes rhizome, elscholtiza, reed rhizome, the root bark of Chinese wolf-berry, celestial grass, burdock, hawthorn and the fruit of Chinese magnoliavine in formulation weight part ratio, often kind of medicinal material is pulverized through pulverizer respectively, cross 60-120 mesh sieve, make meal, then make Ultramicro-powder with Ultramicro-powder ball mill pulverizer, the Ultramicro-powder of aforementioned all medicinal materials is mixed, stir, make A pre-mixing agent; 2) taking betaine, glutamine and feed grade Organic Chromium in formulation weight part ratio, through being pulverized and mixed, stirring, for B pre-mixing agent, by A and B pre-mixing agent mixing and stirring, pack, sealing, is placed in vacuum drying environment, obtains rabbit anti-heat stress feed additive.
The preparation method of aforesaid rabbit anti-heat stress feed additive, it is characterized in that: 1) take honeysuckle, oldenlandia diffusa, the Radix Astragali, the coptis, the bighead atractylodes rhizome, elscholtiza, reed rhizome, the root bark of Chinese wolf-berry, celestial grass, burdock, hawthorn and the fruit of Chinese magnoliavine in formulation weight part ratio, often kind of medicinal material is pulverized through pulverizer respectively, cross 80 mesh sieves, make meal, then make Ultramicro-powder with Ultramicro-powder ball mill pulverizer, the Ultramicro-powder of aforementioned all medicinal materials is mixed, stir, make A pre-mixing agent; 2) take betaine, glutamine and feed grade Organic Chromium in formulation weight part ratio, through being pulverized and mixed, stirring, is B pre-mixing agent; By A and B pre-mixing agent mixing and stirring, pack, sealing, is placed in vacuum drying environment, obtains rabbit anti-heat stress feed additive.
The application of anti-heat stress feed additive in rabbit cultivation of aforesaid rabbit, is characterized in that: described anti-heat stress feed additive, in the ratio of 0.5%-2.0% mass fraction, adds and uses in feed for rabbit.
Effect of the present invention: the effect such as the present invention has clearing away heat and removing summer, Appetizing spleen-tonifying, promotes the production of body fluid to quench thirst, immunity moderation power, by the acting in conjunction of multiple feed addictive composition, can comprehensive coordinate physiological function, alleviate the physiological responses to heat stress of rabbit, improve the feed intake of rabbit, production performance and the price of deed, have that cost is low, easy to use, effective, culture benefit advantages of higher, for the anti-heat stress of rabbit, there is good effect.Fill up the blank of prior art preferably, change the present situation that rabbit does not have special attested compound anti-heat stress feed additive.
Detailed description of the invention
Embodiment 1
Take honeysuckle 30g, oldenlandia diffusa 30g, Radix Astragali 30g, coptis 20g, bighead atractylodes rhizome 30g, elscholtiza 20g, reed rhizome 20g, root bark of Chinese wolf-berry 30g, celestial careless 20g, burdock 40g, hawthorn 30g, fruit of Chinese magnoliavine 20g, pulverize through pulverizer respectively, cross 80 mesh sieves, make meal, Ultramicro-powder is made again with Ultramicro-powder ball mill pulverizer, mixing and stirring is A pre-mixing agent; Taking betaine 30g, glutamine 60g, chromium methionine 10g, mixing and stirring, is B pre-mixing agent.By A and B pre-mixing agent mixing and stirring, pack, sealing, obtains rabbit anti-heat stress feed additive of the present invention.
Embodiment 2
Take honeysuckle 20g, oldenlandia diffusa 20g, Radix Astragali 20g, coptis 15g, bighead atractylodes rhizome 10g, elscholtiza 10g, reed rhizome 10g, root bark of Chinese wolf-berry 20g, celestial careless 10g, burdock 20g, hawthorn 10g, fruit of Chinese magnoliavine 10g, pulverize through pulverizer respectively, cross 60 mesh sieves, make meal, Ultramicro-powder is made again with Ultramicro-powder ball mill pulverizer, mixing and stirring is A pre-mixing agent; Taking betaine 20g, glutamine 50g, yeast chromium 5g, mixing and stirring, is B pre-mixing agent.By A and B pre-mixing agent mixing and stirring, pack, sealing, obtains rabbit anti-heat stress feed additive of the present invention.
Embodiment 3
Take honeysuckle 50g, oldenlandia diffusa 50g, Radix Astragali 50g, coptis 30g, bighead atractylodes rhizome 40g, elscholtiza 30g, reed rhizome 30g, root bark of Chinese wolf-berry 50g, celestial careless 30g, burdock 50g, hawthorn 40g, fruit of Chinese magnoliavine 30g, pulverize through pulverizer respectively, cross 100 mesh sieves, make meal, Ultramicro-powder is made again with Ultramicro-powder ball mill pulverizer, mixing and stirring is A pre-mixing agent; Taking betaine 40g, glutamine 80g, chromium picolinate 15g, mixing and stirring, is B pre-mixing agent.By A and B pre-mixing agent mixing and stirring, pack, sealing, obtains rabbit anti-heat stress feed additive of the present invention.
Embodiment 4
Take honeysuckle 40g, oldenlandia diffusa 40g, Radix Astragali 40g, coptis 30g, bighead atractylodes rhizome 20g, elscholtiza 30g, reed rhizome 30g, root bark of Chinese wolf-berry 40g, celestial careless 25g, burdock 40g, hawthorn 40g, fruit of Chinese magnoliavine 25g, pulverize through pulverizer respectively, cross 80 mesh sieves, make meal, Ultramicro-powder is made again with Ultramicro-powder ball mill pulverizer, being uniformly mixed, is A pre-mixing agent; Taking betaine 25g, glutamine 50g, chromium picolinate 8g, be uniformly mixed, is B pre-mixing agent.Be uniformly mixed by A and B pre-mixing agent, pack, sealing, obtains rabbit anti-heat stress feed additive of the present invention.
Embodiment 5
Take honeysuckle 25g, oldenlandia diffusa 25g, Radix Astragali 25g, coptis 25g, bighead atractylodes rhizome 25g, elscholtiza 25g, reed rhizome 25g, root bark of Chinese wolf-berry 25g, celestial careless 25g, burdock 30g, hawthorn 30g, fruit of Chinese magnoliavine 30g, pulverize through pulverizer respectively, cross 120 mesh sieves, make meal, Ultramicro-powder is made again with Ultramicro-powder ball mill pulverizer, being uniformly mixed, is A pre-mixing agent; Taking betaine 40g, glutamine 70g, nicotinate chromium 15g, be uniformly mixed, is B pre-mixing agent.Be uniformly mixed by A and B pre-mixing agent, pack, sealing, obtains rabbit anti-heat stress feed additive of the present invention.
The effect test of embodiment 6 anti-heat stress agent in otter rabbit is raised.
Select 240 otter rabbits that 3 monthly ages are healthy, body weight is close at rabbit warren, be divided into 4 groups at random, often organize 60, often group establishes 3 repetitions, often repeats 20, male and female half and half.Analysis of variance, between group, original body mass difference is not remarkable.1 group is control group, basal diet of feeding (see table 1), and 2,3,4 groups is test group, adds the product of the product of embodiment 1 of 1.0%, the product of the embodiment 2 of 0.8%, the embodiment 3 of 1.2% respectively in basal diet.Situations such as recording the searching for food of test otter rabbit every day in detail, drink water, be healthy.In duration of test rabbit home, mean temperature is 32.5 DEG C.Preliminary trial period is 7d, and experimental period is 45d.On-test and at the end of, to otter rabbit by only weighing, record the situations such as feed consumption rate, drinking-water, health every day, production performance index determining rabbit feed intake, average daily gain, feed-weight ratio, survival rate; Fur quality index determining hide area, Wool density; Blood parameters measures total serum protein (TP), blood sugar (GLU), blood fat (TG), cortisol (Cor), triiodo thryonine (T
3), thyroxine (T
4) content.Contrast 1 group and 2,3, the average result of 4 test group is in table 2, table 3 and table 4.
Table 1 basal diet composition and trophic level
Note: premix provides by every kg feed: VA12000IU, VD31000IU, VE100mg, Vk3mg, iron 90mg, copper 30mg, zinc 80mg, selenium 0.3mg, iodine 0.3mg, cobalt 0.15mg.
From table 2, add anti-heat stress feed additive in summer in otter rabbit daily ration and can improve its appetite, daily gain and survival rate, test group improves 13.21% than control group daily ingestion amount, and average daily gain improves 21.25%, and feed-weight ratio reduces 6.61%; Survival rate improves 10.71%.
Table 2 anti-heat stress feed additive is on the impact of otter rabbit production performance
As shown in Table 3, in daily ration, add anti-heat stress feed additive, can improve otter coney quality, test group Wool density improves 3.62% than control group, and hide area improves 11.62%.
Table 3 anti-heat stress feed additive is on the impact of otter coney quality
From table 4, add anti-heat stress feed additive in summer in otter rabbit daily ration, TP, GLU, TG, T in serum can be improved
3with T
4content, reduce the concentration of Cor in otter rabbit anteserum.Illustrate that anti-heat stress feed additive can improve the blood parameters of otter rabbit, obvious to the integrally-regulated effect of body.
Table 4 anti-heat stress feed additive is on the impact of otter rabbit blood biochemical indicator
It seems from the actual effect of embodiments of the invention 6 result, the active ingredient of above-mentioned anti-heat stress feed additive, the difficult problem of rabbit is supported at antagonism hot weather in summer, adduction is created under collaborative, be better than its Be very effective single use certain to the actual effect of the effective single composition of other animals, create unforeseeable technique effect, there is outstanding substantive distinguishing features.This is before the present invention tests, and those skilled in the art cannot predict and obtain before not having result of the test checking.
On this basis, analyze the present invention to the contribution of prior art, one is the active ingredient of applicable rabbit of effectively having arranged in pairs or groups out, and make synergistic preparation with it, act on while various active ingredient in said preparation, the successful play is better than the effect of single active ingredient, and this effect be prior art unknown.In prior art and the coefficient feed addictive of these active ingredients of no-trump.In general, the feed addictive of the present invention prepared with preceding method, contains above-mentioned active ingredient, has significant effect for the growing state improving torridity summer rabbit.
The foregoing is only generality of the present invention to illustrate and specific embodiments, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.Constituent involved in the present invention and preparation method all can adjust accordingly according to embodiment, but can not exceed this invention protection domain.
Claims (8)
1. a rabbit anti-heat stress feed additive, is characterized in that: composition comprises honeysuckle 20-50 weight portion, oldenlandia diffusa 20-50 weight portion, Radix Astragali 20-50 weight portion, coptis 15-30 weight portion, bighead atractylodes rhizome 10-40 weight portion, elscholtiza 10-30 weight portion, reed rhizome 10-30 weight portion, root bark of Chinese wolf-berry 20-50 weight portion, celestial careless 10-30 weight portion, burdock 20-50 weight portion, hawthorn 10-40 weight portion, fruit of Chinese magnoliavine 10-30 weight portion, betaine 20-40 weight portion, glutamine 50-80 weight portion, feed grade Organic Chromium 5-15 weight portion.
2. rabbit anti-heat stress feed additive according to claim 1, is characterized in that:
Honeysuckle 25-35 weight portion, oldenlandia diffusa 25-35 weight portion, Radix Astragali 25-35 weight portion, coptis 15-25 weight portion, bighead atractylodes rhizome 25-35 weight portion, elscholtiza 15-25 weight portion, reed rhizome 15-25 weight portion, root bark of Chinese wolf-berry 25-35 weight portion, celestial careless 15-25 weight portion, burdock 35-45 weight portion, hawthorn 25-35 weight portion, fruit of Chinese magnoliavine 15-25 weight portion, betaine 25-35 weight portion, glutamine 55-65 weight portion, feed grade Organic Chromium 8-12 weight portion.
3. rabbit anti-heat stress feed additive according to claim 1 and 2, is characterized in that:
Composition comprises honeysuckle 30 weight portion, oldenlandia diffusa 30 weight portion, the Radix Astragali 30 weight portion, the coptis 20 weight portion, the bighead atractylodes rhizome 30 weight portion, elscholtiza 20 weight portion, reed rhizome 20 weight portion, the root bark of Chinese wolf-berry 30 weight portion, celestial careless 20 weight portions, burdock 40 weight portion, hawthorn 30 weight portion, the fruit of Chinese magnoliavine 20 weight portion, betaine 30 weight portion, glutamine 60 weight portion, feed grade Organic Chromium 10 weight portion.
4. rabbit anti-heat stress feed additive according to claim 3, is characterized in that: described betaine is for adding natural betaine, wherein content >=97% mass fraction of betaine compound.
5. rabbit anti-heat stress feed additive according to claim 3, is characterized in that: feed grade Organic Chromium is any one or wherein several mixtures in chromium methionine, yeast chromium, chromium picolinate, chromium picolinate, nicotinate chromium.
6. the preparation method of the rabbit anti-heat stress feed additive according to claim 1-5, is characterized in that:
1) honeysuckle, oldenlandia diffusa, the Radix Astragali, the coptis, the bighead atractylodes rhizome, elscholtiza, reed rhizome, the root bark of Chinese wolf-berry, celestial grass, burdock, hawthorn and the fruit of Chinese magnoliavine is taken in formulation weight part ratio, often kind of medicinal material is pulverized through pulverizer respectively, cross 60-120 mesh sieve, make meal, then Ultramicro-powder is made with Ultramicro-powder ball mill pulverizer, the Ultramicro-powder of aforementioned all medicinal materials is mixed, stirs, make A pre-mixing agent;
2) taking betaine, glutamine and feed grade Organic Chromium in formulation weight part ratio, through being pulverized and mixed, stirring, for B pre-mixing agent, by A and B pre-mixing agent mixing and stirring, pack, sealing, is placed in vacuum drying environment, obtains rabbit anti-heat stress feed additive.
7. the preparation method of rabbit anti-heat stress feed additive according to claim 6, is characterized in that:
1) honeysuckle, oldenlandia diffusa, the Radix Astragali, the coptis, the bighead atractylodes rhizome, elscholtiza, reed rhizome, the root bark of Chinese wolf-berry, celestial grass, burdock, hawthorn and the fruit of Chinese magnoliavine is taken in formulation weight part ratio, often kind of medicinal material is pulverized through pulverizer respectively, cross 80 mesh sieves, make meal, then Ultramicro-powder is made with Ultramicro-powder ball mill pulverizer, the Ultramicro-powder of aforementioned all medicinal materials is mixed, stirs, make A pre-mixing agent;
2) taking betaine, glutamine and feed grade Organic Chromium in formulation weight part ratio, through being pulverized and mixed, stirring, for B pre-mixing agent, by A and B pre-mixing agent mixing and stirring, pack, sealing, is placed in vacuum drying environment, obtains rabbit anti-heat stress feed additive.
8. the application of anti-heat stress feed additive in rabbit cultivation of the rabbit according to claim 1-5 any one, is characterized in that: described anti-heat stress feed additive, in the ratio of 0.5%-2.0% mass fraction, adds and uses in feed for rabbit.
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| CN114028456A (en) * | 2021-12-03 | 2022-02-11 | 四川省畜牧科学研究院 | Composition for resisting heat stress of young rabbits, application of composition and method for resisting heat stress of young rabbits |
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