175results about How to "Improve feed utilization" patented technology

A preparation method of a microecological culture feed additive belongs to the technical field of livestock and poultry feed additive. A solid fermentation medium comprises 40% of wheat bran, 10% of corn, 9% of soybean meal, 0.5% of urea, 0.1% of potassium dihydrogen phosphate, 0.1% of sodium dihydrogen phosphate, 0.1% of manganese sulfate, 0.2% of calcium chloride and 40% of water. fermentation strains include plant lactobacillus, bacillus subtilis and saccharomyces cerevisiae in a ratio of 1:2:2. The method comprises the following steps: crushing, sieving, mixing, disinfecting, preparing fermentation bacteria liquid, inoculating fermentation strains and obtaining a finished product. The microecological culture feed additive provided by the invention combines functions of nutrition and health care, has no toxic or side-effect or pollution, and can improve antioxidation capability and immunization function of a weaning pigling, increase daily weight gain of the pigling and forage conversion rate, reduce diarrhoea rate, reduce or prevent pigling weaning stress syndrome and substitute antibiotic additive in forage.

The invention discloses a health-care compound feed for prawns and a production method thereof. The invention aims to provide a health-care compound feed for prawns, which can improve immunity in the prawns, utilization rate of feed and water quality, and a production method thereof. The formula of the raw material comprises the following components in part by weigh: 1 to 6 parts of imported white fish meal, 20 to 25 parts of steamed fish meal imported from Taiwan, 2 to 8 parts of steamed fish meal made in China, 18 to 22 parts of high-gluten wheat flour, 15 to 22 parts of peeled soybean pulp, 8 to 15 parts of peanut cakes, 2 to 6 parts of defatted shrimp meal, 1 to 3 parts of beer yeast cream, 1 to 3 parts of soyabean lecithin oil, 0.5 to 2 parts of refined fish oil, 0.5 to 2 parts of monocalcium phosphate and 1 to 4 parts of additive premix. The production method comprises: crushing, primary material mixing, secondary material mixing, hardening and tempering, granulating, braising, aging, drying, cooking, sieving and packaging. The invention can improve the breeding yield of pawns, reduce discharge pollution, improve water environment and the like.

The present invention relates to pre-, pro-, and postbiotic compositions and methods of use for improving the health and nutrition of commercial livestock and companion pets.

The present invention relates to the field of feed formula design, specifically to a novel green broiler chickens complete feed and technique of preparing the same. A safe, pollution-free novel green broiler chickens complete feed of the invention is composed of the following components by weight parts: 55 -60 parts of corn, 10 -20 parts of dehulled bean pulp, 2 -3 parts of corn protein powder, 2 -3 parts of corn alcohol dreg, 2 -5 parts of cottonseed meal, 2 -8 parts of Chinese herbal compound preparation, 0.3-0.4 parts of multi-vitamin, 0.2 parts of composite trace elements. Thebroiler chickens complete feed develops a novel pollution-free non-drug residue green broiler chickens complete feed by adding Chinese herbal compound preparation. The broiler chickens fed by the feed greatly enhances immune function, greatly enhances the immunity against the disease and substantially improves the survival rate.

The invention relates to a production method of bacillus subtilis antimicrobial lipopeptide and application thereof in feeds, belonging to the fields of feed additives and the biotechnology. The production method of the bacillus subtilis antimicrobial lipopeptide comprises the following steps of carrying out amplification culturing on an acillus subtilis fmbj seed culture medium, inoculating by 2-5 percent at the temperature of 28-35 DEG C, deeply fermenting 5000L of fermentor liquid for 30-48h, then extracting, and carrying out spray drying after concentration or directly carrying out spray drying to produce an antibacterial peptide product. The antimicrobial lipopeptide is added into basic daily feeds for broilers by a certain titer, thereby enhancing the feed utilization ratio and having better effect on growing development and immunity strengthening of broilers. The bacillus subtilis is a safe microorganism, and an antibacterial product thereof has high safety. In addition, compared with flavomycin used in the traditional broiler feeds, the bacillus subtilis antimicrobial lipopeptide has better effect and has an important significance on replacing feed antibiotic addition and guaranteeing food safety.

The invention discloses porket creep feed and a production method thereof. The feed comprises the following components in percentage by weight: 30.0 expanded corns, 30.0 high-quality corns, 12.0 high-protein soybean meal, 4.5 whole milk powder, 4.0 fermentative soybean meal, 3.0 expanded soybeans, 3.0 Chilean white fish meal, 3.0 plasma protein powder, 3.0 acidifying agents, 2.0 sugar, 1.2 stone powder, 1.0 calcium dihydrogen phosphate, 1.0 grade-IV soyabean oil, 0.12 methionine, 0.4 lysine, 0.10 threonine, 0.18 salt, 1.0 porket additives and 0.5 medicament additives. The production method comprises the following steps: crushing the high-quality corns, the high-protein soybean meal and the Chilean white fish meal at one time, granulating at a high temperature and cooling; carrying out secondary crushing after the granulated and cooled high-quality corns, the high-protein soybean meal and the Chilean white fish meal are mixed with the expanded corns and the expanded soybeans; carrying out tertiary mixing with other components of the feed according to the weight percentage and granulating at a low temperature; and packaging and warehousing. The invention optimizes the quality of the porket creep feed, improves the stability and the palatability of the feed, strengthens the digestion and absorption and the availability of nutrition, promotes the health growth of porkets and effectively controls diarrhea, growth retardation, and the like.

The invention discloses a bio-enzyme and microorganism containing compound feed additive and a preparation process thereof, which solve the problems of high production cost and less viable count of beneficial microorganisms in the prior art. The bio-enzyme and microorganism containing compound feed additive is characterized in that the additive is prepared by compounding a viable organism preparation (prepared by carrying out liquid fermentation and low-temperature drying on bacillus subtilis and brewer's yeast) with an enzyme preparation (prepared by carrying out solid fermentation and drying on trichoderma reesei and Aspergillus niger); and the viable count of beneficial microorganisms in each gram of the product is greater than 8*10<9> cfu / g, the cellulase activity (refer to the quantity of cellulose degraded by each gram of the product per minute) is greater than 500 mg, the alpha-amylase activity (refer to the quantity of starch hydrolyzed by each gram of the product per minute) is greater than 3000 mg, and the protease activity (refer to the mount of an amino acid generated by caseins hydrolyzed by each gram of the product per minute) is greater than 400 mg. The bio-enzyme and microorganism containing compound feed additive disclosed by the invention has the advantages that: the feed utilization rate of livestock can be improved in a short term, the intestinal digestive flora of livestock is improved and balanced, the breeding cost is reduced, and the feed conversion rate and the animal production performance are improved; and meanwhile, the additive is simple in preparation process, low in production cost, and suitable for industrialized production.

The invention provides hyperchromic fish grain for spectacular fish, which contains as follows by weight percentages: white fishmeal 50-60%, starch 20-30%, bean powder 9-15%, fish oil 5%, carophyll pink 0.5%, Haematococcus 0.5-1.5%, yeast powder 3-5%, compound vitamin 1% and mineral matter 1%. The fish grain can remarkably improve coloring and hyperchromic effect of fish, thereby enhancing ornamental ability of fish. The produced fish grain feed coefficient is <=1.2, and the stability in water is more than 24 hours, and has smooth, rounding and beautiful appearance, good feeding attraction, and high absorption and usage rates.

A forage for improving later-period production performance of laying hens and eggshell quality comprises, in parts by weight, 45-50 parts of corn, 10-15 parts of soybean meal, 8-12 parts of wheat, 5-10 parts of corn germ cake, 3-6 parts of alfalfa meal, 4-6 parts of calcium particles, 4-6 parts of brewer's grains, 3-5 parts of calcium powder, 2-4 parts of corn gluten meal, 0.5-1 part of calcium hydrogen phosphate, 0.1-0.2 part of bentonite, 0.2-0.4 part of plant grease, 0.0005-0.0008 part of betaine, 0.2-0.4 part of edible salt, 0.2-0.4 part of lysine, 0.1-0.2 part of composite vitamins, 0.1-0.2 part of choline, 0.1-0.2 part of composite trace elements, 0.1-0.2 part of sodium bicarbonate, 0.1-0.2 part of methionine and 0.002-0.006 part of phytase. The forage is capable of satisfying nutrition demands of laying hens at a later period, improving laying rate and eggshell thickness, and improving eggshell quality.

The invention relates to a feeding method for producing high-quality goose meat. The feeding method is characterized in that in the whole production process of broiler geese, animal feed containing a Chinese herbal medicine feed additive is adopted for feeding, wherein the Chinese herbal medicine feed additive comprises the following components: plantain herb, common andrographis herb, milkvetch root, villous amomum fruits, medicated leaven, pilose asiabell root, epimedium herb, pokeberry root, manyflower solomonseal rhizome, officinal magnolia bark, Chinese magnoliavine fruits, cortex acanthopanacis radicis, cyrtomium fortunei, rhubarb, heartleaf houttuynia herb, ginger, mulberry fruits, peppermint, common lophatherum herb, cape jasmine fruits, baical skullcap root, reed rhizome, great burdock achene, hawthorn fruits, liquorice root, pine needle powder and the like. The invention aims at solving the problems of residual unfavorable medicaments and heavy metals in animal bodies, poor meat quality and the like and producing safe, green, delicious and sweet animal meat products; and meanwhile, the immunity of animals is strengthened, the growth is promoted, and the disease incidence and the mortality rate are reduced under the situation of not using any antibiotic type medicament additives.

The invention discloses an antibiotic-free weaned-piglet complete feed and a preparing method thereof. The antibiotic-free weaned-piglet complete feed is antibiotic-free efficient complete feed capable of meeting the nutritional requirements of weaned piglets, promoting digestion and using of nutrient substances, improving the immunity function and the resistance of piglet bodies and reducing the diarrhea rate. The preparing method includes the steps that in the formula proportion, weighed corn, weighed high protein bean pulp and weighed extruded soybeans are smashed to be subjected to first-time high-temperature pelletizing, thin smashing is carried out after pellets cool, then weighed imported fish meal, weighed calcium hydrophosphate, weighed mountain flour, weighed salt, weighed soybean oil, weighed whey powder, weighed feed grade lysine, weighed methionine, weighed threonine, weighed premixed materials for the weaned piglets and compounded Chinese herbal medicine are mixed to be even, then second-time low-temperature pelletizing is carried out, cooling is carried out, then a finished product is packed, and the weaned piglets can be directly fed. Particles of the weaned-piglet feed produced with the preparing method are good in filling power, low in hardness, good in water dissolving performance, high in nutritive value, good in palatability, sanitary and safe, the diarrhea rate is reduced, the feed use ratio of the weaned piglets is increased, the production performance of the weaned piglets is improved, and antibiotic harm is avoided.

The present invention relates to animal feed additives, which additives comprise a monocomponent xylanase derived from a strain of Byssochlamus, Chaetomium, Humicola, Malbranchea, Mucor, Myceliophthora, Paecilomyces, Talaromyces, Thermoascus, or Thielavia. In other aspects, the invention relates to monocomponent xylanase preparations, DNA constructs, recombinant expression vectors, host cells, and methods of producing monocomponent xylanase preparations.

The invention discloses a combined culture method of fresh water grass carps. The combined culture method comprises the following steps: feeding grass carps with the weight of 2g-50g with a feed with the protein content more than or equal to 32% and the particle size of 1.0mm-2.0mm; feeding grass carps with the weight of 50g-250g with a feed with the protein content of 30%-32% and the particle size of 2.0mm-3.0mm; feeding grass carps with the weight of 250g-750g with a feed with the protein content of 28%-30% and the particle size of 3.0mm-5.0mm; and feeding grass carps with the weight of more than 750g with a feed with the protein content less than or equal to 26% and the particle size of 5.0mm-7.0mm. According to the combined culture method, the scientific feeding of the feeds is emphasized; feeds with adaptive nutritional ingredients are fed according to different growth periods of the grass carps, and meanwhile, the particle sizes of the feeds are reasonably selected, so that the efficient feeding of the feeds is realized, and the problem that an existing feed adoption mode of the grass carps is not matched with the feeding habit, digestive physiology and nutrition metabolism of the grass carps is solved; the combined culture method is suitable for being widely popularized and used.

The invention discloses a micro-ecological additive for preventing white muscle diseases of flocks and herds. Main components of the micro-ecological additive are following raw materials in parts by weight: each kilogram of the additive contains 6.5*10<10>-8.0*10<14>CFU of selenium-enriched saccharomycetes, 6.5*10<10>-8.9*10<14>CFU of lactic acid bacteria, 2.1*10<9>-4.5*10<14>CFU of bacillus, 50-150g of milk powder and 10-20g of trehalose. The feed additive provided by the invention is reasonable in formula and low in cost, does not contain antibiotics and contains high-activity probiotics and selenium yeast with high content; the micro-ecological additive is good for improving the micro-ecological balance of intestinal canals of the flocks and the herd and improving the immunity and the growth condition; more importantly, the organic selenium is supplemented so as to relieve the occurrence of the white muscle diseases of calves and lambs. The micro-ecological additive disclosed by the invention is suitable for being used for developing green and healthy cultivation and producing harmless animal by-products.

The invention relates to an apple pomace microbial culture starter, its preparation method and a method for producing biological feed by the apple pomace microbial culture starter. The apple pomace microbial culture starter comprises 1-15% of candida, 1-15% of geotrichum candidum, 1-15% of Aspergillus niger, 1-15% of Aspergillus oryzae and 1-15% of bacillus subtilis. The method utilizes a pomace multi-bacterium synergistic biological fermentation technology. The feed culture starter contains acid-forming bacteria, cellulose decomposition bacteria, protein production bacteria and disease-resistant health care bacteria and through synergism of the bacteria, a pomace conversion utilization rate is improved, a digestion rate is improved, crude fiber content is reduced and crude protein content is improved. The biological feed prepared by the apple pomace microbial culture starter contains comprehensive nutrients, is green and safe, has a low cost and high benefits, substantially reduces hoof diseases of female animals bred in the feeding farm, improves a reproductive rate, is suitable for large scale and industical production and has a wide application prospect.

The invention belongs to the technical field of insect feed additives, and particularly discloses an insect additive for poultry and livestock feeds and application of the insect additive. The additive comprises the following components in part by weight: 20 to 50 parts of insect albumen powder, and 1 part of chitin and antimicrobial peptide. The chitin and the antimicrobial peptide which are extracted from insects are used for compounding the additive for the feeds, and the quality of the feed is improved, so that the quality of raised animals is effectively improved, and safe and healthy meat and fish or egg products are produced.

The invention relates to a production method of Bacillus subtilis antimicrobial lipopeptide and application of the Bacillus subtilis antimicrobial lipopeptide in piglet feeds, belonging to the technical fields of feed additives and biology. The method comprises the following steps: carrying out amplification culture on Bacillus subtilis fmbJ in a seed culture medium, inoculating 2-5% of Bacillus subtilis, carrying out submerged fermentation in a 5000L fermentation tank at 28-35 DEG C for 30-48 hours, extracting, and carrying out spray drying to obtain the antimicrobial lipopeptide product. When 4000IU of antimicrobial lipopeptide is added to every 1kg of basic ration for piglets, the antimicrobial lipopeptide increases the utilization ratio of the feed, and has favorable effects on promoting the growth and development of piglets, preventing piglets from diarrhoea and enhancing the immunity of piglets. The Bacillus subtilis strain provided by the invention is a safe microbe, and the antimicrobial product has high safety. In addition, compared with flavomycin used in the existing piglet feeds, the Bacillus subtilis antimicrobial lipopeptide has a better effect, and has important meanings for substituting feed antibiotic additives and ensuring food safety.

The invention relates to a production method of bacillus amyloliquefaciens antimicrobial lipopeptide and application thereof in prawn feeds and belongs to the technical fields of aquiculture and biology in the field of agriculture. The production method comprises the following steps that bacillus amyloliquefaciens fmb-50 with the collection number of CGMCC No.6249 is used as a strain and is sequentially subjected to seed culture, amplification culture and fermentation production to obtain fermentation liquor; the thalli of the fermentation liquor are removed through microfiltration or membrane filtration and nanofiltration; corn starch or porous starch is added for absorption and spray drying is carried out, thus obtaining an antibacterial substance feed additive with the antibacterial valence of 40000-50000 IU / g or 250000 IU / g. The antibacterial substance which is produced from the bacillus amyloliquefaciens fmb-50 through fermentation can be industrially produced in a large scale; the production period is short and production cost is greatly reduced; when used in the prawn feeds, the antibacterial substance can reduce the mortality rate, improve the utilization ratio of the prawn feeds, promote the nonspecific immunoreaction of prawns and enhance the energy metabolism level.

The invention relates to a compound feed for producing health-care eggs with high iodine and low cholesterol. The compound feed is characterized by comprising the following components in percentage by weight in a formula: 63.65 percent of corn, 19.52 percent of soybean meal, 2 percent of fish meal, 4 percent of algae powder, 8.15 percent of stone powder, 1.62 percent of calcium hydrogen phosphate, 0.06 percent of methionine and 1 percent of premixed feed. A production method for the algae powder comprises the following steps of: cleaning algae by using seawater to remove sand and impurity, naturally airing or drying the algae, and crushing the algae into 30 to 40 meshes by a crusher. The compound feed broadens the utilization path of the natural wild algae powder, changes waste into valuable and reduces the production cost by using the algae powder taking enteromorpha as a main body and conventional feed raw materials. The compound feed does not contain antibiotic and other medicinal feed additives, can obviously improve the egg laying performance of chickens and the feed utilization rate, and also can produce the health-care eggs with main characteristics of high iodine and low cholesterol.

The invention provides a highly effective and environmental protection compound feed for rockfish comprising the following raw materials (by weight proportions): protein 60-79, fats 5-10, sugar 9.67-22.35, anti-oxidizing agent 0.25-0.5, immunopotentiator 0.1-0.2, composite vitamin 2.6-3 and composite minerals 0.3-0.5.

The invention relates to a feed and particularly relates to a green compound feed capable of reducing the morbidity of piglets. The feed is prepared from the following raw materials in parts by weight: 70-75 parts of corns, 12-15 parts of buckwheat bran, 3-4 parts of red koji powder, 10-12 parts of sunflower seed cakes, 18-20 parts of soya bean meal, 10-12 parts of oat shells, 8-10 parts of dried apple cores, 3-4 parts of sugared garlic, 4-5 parts of aloes, 6-8 parts of dried ryegrass, 2-3 parts of pepper seeds, 5-6 parts of garlic dregs, 3-4 parts of fish meal, 2-3 parts of calcium hydrophosphate, 2-3 parts of fish visceral meal, 1-2 parts of lophatherum gracile, 2-3 parts of platycodon grandiflorum, a proper amount of table salt and 4-5 parts of a phagostimulant. On the basis of physiological characteristics of the piglets, the prepared feed is easy to digest and good in palatability; the raw materials including the garlic dregs, the sugared garlic, the lophatherum gracile, the platycodon grandiflorum and the like are added so that the physique of the piglets can be improved, the disease resistance of the piglets is improved and the morbidity of the piglets is reduced; all the raw materials are pure natural components so that the negative effects to the growth of the piglets are avoided.

The invention relates to an application of an entomogenous fungi liquid fermentation mycelium as a shrimp feed additive, and belongs to the technical field of feed. The entomogenous fungi liquid fermentation mycelium is a Hirsutella sinensis liquid fermentation mycelium, a Paecilomyces gunnii liquid fermentation mycelium, or a Paecilomyces militaris liquid fermentation mycelium. The entomogenous fungi liquid fermentation mycelium is used for improving the growth indexes such as the survival rate, the weight gain rate and the feed utilization rate of white shrimps and increasing immunity.

The invention relates to an acidic proteinase and a preparation method thereof and the acidic proteinase belongs to the microbial acidic proteinase. The invention is characterized in that 1) the enzymatic characteristics of the acidic proteinase are as follows: the optimum pH value is 2.5-3.5, the stable pH value is 2.5-6.0; the optimum temperature is 40-50 DEG C, the temperature stability range is 30-50 DEG C; and 2) the preparation method uses Aspergillus Niger which is stored in the China Center of Industrial Culture Collection (CICC) and has a preservation number of 2238, as the enzyme-producing strain and uses wheat bran as the raw material; the solid fermentation technology is adopted for preparation; the fermentation and enzyme-producing capability is not less than 47000u / g (dry yeast), the liquid enzyme yield is not less than 85% and the soid enzyme yield is not less than 80%, which all achieve the food grade sanitation standard. The invention provides the acidic proteinase and the preparation method thereof, wherein the utilization rate of the fermentation equipment is high, the byproduct of crop processing is used as the main raw material, the enzyme activity for fermentation is high, the extracting and purifying rate of enzyme is high and the production cost is low. The acidic proteinase of the invention is suitable to be used as the raw material or product additive of the products in the leather industry, the pharmaceutical industry, the brewing industry and the feed industry.

The invention discloses a biological feed for soft-shelled turtles. The biological feed contains a bacillus licheniformis premix and a Chinese herbal medicine preparation, wherein the Chinese herbal medicine preparation is prepared from the following raw materials: radix isatidis, honeysuckle, dandelion, licorice, rheum officinale, rhizoma coptidis, radix scutellariae and cortex phellodendri; the bacillus licheniformis premix is a microencapsulated preparation of bacillus licheniformis. The biological feed is used for feeding young soft-shelled turtles, and can promote growth and survival rate of the young soft-shelled turtles, increase the reward of feeds, and shorten the incubation period of the soft-shelled turtles. Once the feed is used for feeding adult soft-shelled turtles, the soft-shelled turtle can be promoted to be large, the weight is increased significantly, the weight is uniform, and the skin of the whole body of the soft-shelled turtle is yellow and beautiful. The feed promotes the hematopoietic function and wound healing of the soft-shelled turtles, and enhances the immunity and disease resistance of the soft-shelled turtles. The death rate caused by stress is reduced.

The invention discloses a molecular marker capable of affecting the abdominal fat percentage of a chicken, and application of the molecular marker, particularly relates to application of a chicken ALDH1A3 gene 3' noncoding region sequence g.941 T>C molecular marker as a detection site for authenticating the abdominal fat percentage of the chicken, and is characterized in that the abdominal fat percentage of a CC genotype individual is obviously greater than the abdominal fat percentage of a TT genotype individual and the abdominal fat percentage of a TC genotype individual. When the molecularmarker disclosed by the invention used for carrying out marker assisted selection, the abdominal fat percentage obtained after the chicken is slaughtered can be greatly lowered, a feed use ratio of achicken flock is improved, and breeding cost is lowered. Through the molecular marker combination and a detection primer, an efficient and accurate molecular marker assisted breeding technology can beestablished, then, the efficient and accurate molecular marker assisted breeding technology is applied to abdominal fat percentage character genetic improvement after a breeding chicken is slaughtered, the abdominal fat percentage after the chicken is slaughtered is lowered, a feed use ratio of the chicken flock is improved, the sales of enterprises can be improved, and core competitiveness is increased.

The invention provides acid protease which is derived from microorganism sources and a preparation method thereof. The acid protease is characterized in that a. enzymology characteristics: the optimumpH is 2.5-3.5, the stable pH is 2.5-6.0, the optimum temperature is 40-50 DEG C, and the temperature stability ranges from 30 DEG C to 50 DEG C; b. with A. niger as an enzyme producing strain and wheat bran as main materials, the acid protease is prepared by solid fermentation process; the fermenting and enzyme producing capabilities are more than or equal to 47000u / g (based on dry yeast), the yield of liquid enzyme is more than or equal to 85% and that of solid enzyme is more than or equal to 80%, which all reach the food grade hygienic standards. The acid protease takes grain processing by-products as main raw materials and has high fermentation enzyme activity, high enzyme extraction purification yield and low production cost. The acid protease is suitable for serving as the preparation raw material or the additive of the products in such industries as tanning, medicine, brewing and feed.

The invention relates to feed for Acanthopagrus schlegelii juvenile fish. The feed comprises raw materials in percentage by weight as follows: 20%-30% of soybean meal, 35%-50% of soybean protein concentrate, 10%-15% of fish meal, 1%-3% of corn oil, 1%-3% of peanut oil, 0.5%-1% of vitamins, 0.5%-1% of composite mineral substances, 0.1%-0.5% of compound amino acid, 0.4%-1% of a compound enzyme preparation, 0.1%-0.5% of polysaccharides, 1%-5% of marine oligosaccharides, 5%-7% of white ants and 3%-5% of a Chinese herb medicine additive. The feed has good palatability, facilitates feeding of the Acanthopagrus schlegelii juvenile fish, increases the survival rate and the feed utilization rate, reduces disease spread and pollution to the water quality of an aquaculture water area and is safe and reliable to use and environment-friendly.

The invention relates to the technical field of feed production and specifically relates to a liquid compound acidifier with a strong buffer capacity and a preparation technology thereof. The liquid compound acidifier is prepared from ammonium formate, formic acid, acetic acid, lactic acid, copper sulfate and purified water. Each 100L of liquid compound acidifier contains 18-23kg ammonium formate,20-30kg formic acid, 8-10kg acetic acid, 25-30kg lactic acid, 20-25kg copper sulfate and the balance of purified water. After the liquid compound acidifier provided by the invention is diluted and used, change on acidity is small. The liquid compound acidifier is capable of slowly releasing in stomach and intestinal tracts, reducing stimulation to mucous membrane and achieving excellent acidity-regulating, antibacterial and sterilizing effects.

The invention discloses a method for relieving heat stress of black-bone chicken. According to the method, a heat stress resistant feed additive which is obtained by orderly mixing resveratrol, buckwheat protein powder and corn starch in order according to the proportion of mass parts being (100-300):(300-200):(600-500) is added into a feed; and the application method is as follows: the feed additive and a chicken compound feed or a diet are mixed according to the proportion of mass parts being (0.5-2):1000. According to the method, production efficiency of the black-bone chicken in the heat stress stage can be improved, food intake amount, daily gain and dressing percentage are increased, and immunocompetence and antioxidant function are enhanced so as to improve the heat stress resistance capacity of the black-bone chicken. The resveratrol can be used as an additive for promoting growth and resisting heat stress, and simultaneously the method is rich in raw material resources, controllable in production cost, strong in market demand, and suitable for industrialized development and production.

The invention discloses a nettle pig feed, wherein nettle powder or a nettle extract is utilized to replace an antibiotic and added into the pig feed, and the adding amount of the nettle powder and the adding amount of the nettle extract respectively account for 3.0-7.5% and 0.05-0.5% of the total weight of the pig feed. By feeding pigs with the nettle pig feed, the growth rate is accelerated, the digestion and absorption capacity is enhanced, the pig immunity is improved, the occurrence of diseases is reduced, the feed reward is improved, the feeding cost is reduced, and the economic benefits are improved. Particularly, the feed formed by matching does not produce any toxic and side effects to the growth of the pigs, and no residue of the feed exists in produced pork; furthermore, as nettle contains various substances with biological activity, such as flavonoids, polysaccharides and the like, the immunity of animal bodies can be improved, the application of the antibiotic and veterinary medicaments can be reduced, safe livestock products can be produced, and the nettle pig feed is conductive to human health. By applying the nettle pig feed, the demands of people on green foods and green safe pork are gradually enhanced.