33results about How to "Increase egg production" patented technology

The invention discloses a culture method for improving the reproductive capacity of indigenous nematodes and application of the culture method, and belongs to the technical field of indigenous nematode culture. According to the present invention, the Rosselomyces aquimaris L-3 strain is the indigenous nematode intestinal tract strain, is the new strain, can enrich the nutrition source of the indigenous nematode, can significantly improve the egg laying amount of the nematode fed with the strain in the early stage of the breeding period, and can improve the egg laying amount by 36.3% compared with the currently common E. coli OP50 bacteria, and can not produce any harm to the indigenous nematode; the provided culture method is convenient and efficient, the breeding speed of indigenous nematodes can be remarkably increased under the laboratory environment condition by adopting the culture method provided by the invention, and compared with the currently common E. coli OP50 bacteria, the extremely remarkable difference can be achieved in the second breeding day, the necessary nematode number can be provided for short-period experiments, and the related research process can be accelerated.

The invention discloses a laying hen intelligent feeding condition management method and system, and relates to the technical field of breeding management. The method comprises the following steps: extracting an initial parameter value of a feeding condition of each item of a corresponding week age of each laying hen group of the current batch in a range of execution parameter values of a feeding condition of each item of each week age of each laying hen group of a previous batch in a fence; continuously acquiring the average egg yield of each laying hen group in each week age during the breeding period of the laying hens in the same batch; adjusting the initial parameter value of the feeding condition of each item of each laying hen group of the current week age according to the difference value between the average egg production of the current batch of laying hens and the average egg production of the last batch of laying hens at the previous multiple week ages, and obtaining the execution parameter value of the feeding condition of each item of each laying hen group of the current week age. The feed effectively improves the egg yield of laying hens.

The present invention discloses a strain of Riemerella anatipestifer phage PT15, a phage composition thereof and its application. The phage PT15 has a deposit number of CGMCC No. 22377 and was deposited in the China General Microbiological Culture Collection Center on April 12, 2021. The present application also provides a phage composition comprising the above-mentioned phage. The above-mentioned phage and phage composition can be used as active ingredients for the preparation of therapeutic drugs and feed additives, and are used in the prevention and treatment of duck bacterial serositis. The phage composition has the advantages of safety, high efficiency and non-toxic side effects, and can be used as an active ingredient of a new type of environmental disinfectant to effectively prevent and control the pollution of breeding environment and feeding facilities, and has good application prospects.

The utility model discloses a multifunctional double-layer coop structure which comprises a mounting frame, a rectangular frame structure with an upper layer and a lower layer is formed by steel rods, the outer side of each layer of frame is wrapped with an iron gauze to form a coop main body structure, and a tray for collecting manure is placed between the upper layer of frame and the lower layer of frame. Ventilation nets are symmetrically installed on the two sides of the installation frame, and the ventilation nets and the iron gauze form an external interception structure of the double-layer coop. According to the multifunctional double-layer coop structure, the anti-corrosion and waterproof coop bag is matched with the binding belt so that the anti-corrosion and waterproof coop bag can collect chicken manure falling from the mounting frame and the iron gauze in a centralized mode, the binding belt is disassembled, the anti-corrosion and waterproof coop bag can be disassembled and assembled, the chicken manure is prevented from being accumulated in a breeding area, and odor is reduced; in order to further reduce the emission of odor, hermetia illucens larvae are put into the anti-corrosion and waterproof excrement pockets for in-situ conversion to consume chicken manure, so that the generation of odor is reduced, and the excrement is converted into insect sand to be directly returned to the field for utilization.

The invention discloses a method for constructing a transgenic zebrafish model of hypoxia response. The method comprises the following steps: firstly assembling an sv40mp promoter after a hypoxia response element HRE sequence and cloning the promoter into a pT2AL200R150G plasmid carrying green fluorescent protein (GFP), then microinjecting the recombinant plasmid and transposase mRNA into zebrafish embryos, and inserting the recombinant sequence into the genome of F0 generation zebrafish by Tol2 transposon technology; raising the F0 generation fish to adult fish, hybridizing with wild-type zebrafish to produce F1 generation, hybridizing the F1 generation with the wild-type fish again to produce single-copy transgenic zebrafish F2 generation, self-pollinating male and female sibling zebrafish of the F2 generation, and screening out transgenic zebrafish Tg (HRE-sv40mp:GFP) of hypoxia response of F3 generation that can be stably inherited. The transgenic zebrafish Tg(HRE‑sv40mp:GFP) constructed in the present invention can be used as a simple and efficient hypoxia response model for biological research in hypoxia-related fields, as well as for screening molecular targeted drugs for HIF‑1α, providing a living animal screening model for the development of anti-tumor drugs.

The present invention provides a pharmaceutical composition for preventing and treating avian white crown disease, belonging to the technical field of chicken breeding. The pharmaceutical composition of the present invention is prepared by mixing 10 to 30 parts of Morin hydrate, 5 to 20 parts of artemisinic acid, 5 to 20 parts of quinic acid, and 5 to 20 parts of ginsenoside total saponin sulfate derivatives. It can effectively improve the phenomena of a sharp drop in egg production rate, an increase in soft-shell eggs, and an increase in mortality rate of sick laying hens in cages, so that the egg production rate, egg quality, and lean meat content can be restored to normal levels; enhance the disease resistance of poultry, reduce stress reactions caused by factors such as drastic changes in temperature and microbial invasion, and improve the immunity of animal bodies; the dosage is small and the curative effect is significant. The high-dose oral liquid of the pharmaceutical composition prepared by the present application was used to feed sick chickens, and the effective rate of treatment reached 100%, and the cure rate reached 94.00%.

The invention discloses a laying hen production data management system based on cloud computing, which belongs to the technical field of cloud computing and comprises an environment acquisition module, a cloud computing platform and a production management mode adjustment module. Wherein the environment acquisition module is used for periodically acquiring environment parameters, feed ratio data and laying hen health state data in a chicken house and transmitting the environment parameters, the feed ratio data and the laying hen health state data to the cloud computing platform in a wireless or wired mode; the cloud computing platform is used for analyzing and evaluating the collected environment parameters, feed proportion data and laying hen health state data to obtain a comprehensive evaluation value of the laying hen production environment; and the mode adjusting module is used for selecting a management mode according to the comprehensive evaluation value and dynamically adjusting laying hen production data. The laying hen production data are collected, analyzed and optimized in real time through the cloud computing platform, accurate regulation and control of the production environment are achieved, and the production benefits of laying hens are improved.

The utility model discloses an automatic cleaning laying hen breeding cage, including hencoop, excrement cleaning mechanism, crib cleaning mechanism and control panel, control panel is installed on one side of hencoop, the hencoop is formed by connecting cage body and frame, excrement cleaning mechanism includes collecting tank, screw transmission group, support seat, cleaning box and cleaning roller, and the cleaning roller is connected with the collecting tank. The feeding trough cleaning mechanism comprises a flow guide pipe and a scraping plate. The chicken coop is provided with the excrement cleaning mechanism, the feeding trough cleaning mechanism and the control panel, excrement generated by laying hen breeding can be automatically collected, excrement adhering to the bottom face of the chicken coop can be cleaned, peculiar smells and virus spreading in a breeding house are reduced, meanwhile, residual feed in the feeding trough is cleaned, and the breeding efficiency is improved. Bacteria breeding in the feeding trough is avoided, a good feeding environment is provided for laying hens, and the egg laying yield is increased.

The present application belongs to the field of bio-technology of agriculture and forestry, and relates to a method for increasing the egg production of Spodoptera litura based on irradiation mode. 60 Co source irradiation treatment; the irradiated Spodoptera litura pupae are cultured in an incubator to emerge, then the adults are moved to an adult rearing cage for rearing, and honey water is provided for nutrition. Through effective accumulated temperature treatment, a large number of Spodoptera litura pupae with consistent development are selected as irradiation objects, which can greatly increase the egg production of Spodoptera litura under the premise of ensuring the emergence rate of Spodoptera litura pupae and the lifespan of adults, increase the production of test insects, and the operation process is simple, safe and reliable, which provides a large amount of production insect source for conveniently and quickly producing biological control agent nuclear polyhedrosis virus by using Spodoptera litura, and expanding the host parasitic wasp by using the insect as host.

The application provides a composition for improving intestinal digestive enzyme activity and application thereof, and belongs to the technical field of animal medicine. The composition is composed of double-kidney polysaccharide, ginsenoside Rb1 and ginsenoside Rg1. In the composition, the mass ratio of the double-kidney polysaccharide, the ginsenoside Rb1 and the ginsenoside Rg1 is 90:5:5 or 95:2.5:2.5, preferably 90:5:5, and the intestinal digestive enzyme is specifically duodenal trypsin and amylase. Experimental results show that the composition can significantly synergistically improve the activities of the duodenal trypsin and amylase of laying hens, improve the feed utilization rate, thereby improve the egg production rate, improve the egg weight and the eggshell strength, and effectively improve the breeding benefit of the laying hens.

The invention relates to the field of feed additives, and discloses a folium cortex eucommiae compound feed additive and a preparation method thereof, and the folium cortex eucommiae compound feed additive comprises the following components in parts by weight: 60-90 parts of fermented folium cortex eucommiae powder, 10-20 parts of cortex eucommiae seed meal, 1-5 parts of a traditional Chinese medicine extract, 2-10 parts of a microbial preparation, 5-10 parts of charcoal modified montmorillonite and 2-10 parts of a yeast cell wall extract. The folium cortex eucommiae compound feed additive is prepared by mixing the fermented folium cortex eucommiae with high-activity component content, the treated folium cortex eucommiae seed meal, the traditional Chinese medicine extract, the biochar modified montmorillonite and the yeast cell wall extract, and the folium cortex eucommiae compound feed additive prepared by the method has high-activity components; and under the condition that antibiotics and vaccines are not used, the production performance of the laying hens can be improved, the laying rate of the laying hens is increased, the soft and broken egg rate is reduced, animal health is maintained, the content of total cholesterol, triglyceride and low-density lipoprotein in blood is reduced, the content of high-density lipoprotein is increased, and the death rate of the laying hens is reduced.

The invention discloses a folic acid nanoemulsion capable of increasing the egg laying rate of protaetia brevitarsis and application of the folic acid nanoemulsion. The folic acid nanoemulsion comprises the following components in percentage by mass: 0.003%-0.005% of folic acid, 0.02%-0.1% of sodium bicarbonate, 3%-4% of ultrapure water, 16%-19% of a surfactant, 6%-9% of a cosurfactant and 67.895%-74.977% of an oil phase. The method has the remarkable effects that the folic acid content ranges from 0.02 mg / kg to 0.05 mg / kg in a feed mixing and administration mode, the single female egg laying rate of the protaetia brevitarsis can be increased by 5.72% to 25.29% when the protaetia brevitarsis is fed to female protaetia brevitarsis, and nutrition preparation support is provided for increasing the egg laying rate in the large-scale breeding process of the protaetia brevitarsis.

The invention discloses a targeted compound probiotic preparation for producing SOD (superoxide dismutase) eggs, which is prepared from the following active ingredients in percentage by mass: 5 to 15 percent of bacillus licheniformis, 3 to 10 percent of pseudomonas strain NJ-62, 15 to 30 percent of saccharomyces boulardii, 10 to 20 percent of lactobacillus plantarum, 8 to 15 percent of bacillus subtilis, 10 to 20 percent of candida utilis and 5 to 15 percent of lactobacillus acidophilus. The invention relates to the technical field of healthy breeding of livestock and poultry and production of functional food, in particular to integrated production of'safety 'and'function', specifically, targeted biological detoxification and nutrition metabolism induction technologies are deeply integrated for the first time, and complex probiotic groups remove antibiotics, heavy metals and other endogenous and exogenous pollutants in advance, so that a'clean 'physiological environment is created for laying hens; on the basis, efficient synthesis of SOD is specifically induced, and the problem of potential safety hazards of the functional eggs is fundamentally solved.

The invention provides a compound feed additive containing marine organism extraction components, a preparation method of the compound feed additive and application of the compound feed additive in quail breeding. The additive is prepared from natural components such as a seaweed extract, deep sea fish oil, coral calcium powder, astaxanthin, a marine microorganism fermentation product, a kelp extract, pearl powder and marine collagen peptide through a specific process. The preparation method of the additive comprises the following steps: uniformly mixing all the components under specific conditions, and then drying to specified moisture content through a spray drying method. The additive is rich in marine bioactive components, can comprehensively meet the nutritional requirements of quails, and improves the growth performance and immunity of the quails. In the quail feeding process, 6-10 kg of the additive is added into each ton of basal feed, and the laying rate, egg quality and growth speed of quails can be remarkably improved. The invention provides an efficient and environment-friendly feed additive for the quail breeding industry, and the feed additive has a wide market application prospect.

The invention discloses a formula feed with an effect of treating dysentery and a preparation method thereof. The formula feed comprises the following raw material components: corn, soybean meal, soybean oil, protein, calcium, phosphorus, vitamin B2, glucose, linolenic acid, malic acid, selenium, carotene, coptis chinensis, xanthium sibiricum, burdock, oriental wormwood, common nightblooming cereus, folium artemisiae argyi, white chrysanthemum, caulis spatholobi, lophatherum gracile, sargentgloryvine stem, Chinese prickly ash seeds, red chili powder, pine needle meal, red-seed fruits and red-seed leaves. The preparation method comprises the following steps: S1, preparing nutrients for later use; s2, preparing traditional Chinese medicine liquid for later use; s3, preparing coloring powder for later use; s4, uniformly stirring the corn, the soybean meal and the soybean oil to obtain a primary mixture; s5, steaming the primary mixture in a steamer to obtain a steamed mixture; s6, adding traditional Chinese medicine liquid into the steamed mixture; s7, adding coloring powder to obtain a coloring mixture; and S8, after airing, mixing the aired mixture with nutrients, and uniformly stirring to obtain the finished product formula feed.

This invention discloses a method for breeding a breeding stock, comprising the following steps: Step 1: Determining the combining ability testing scheme for the parent generation of Kebai chickens; Step 2: Analyzing the combining ability testing data of the parent generation and screening out commercial generations; Step 3: Measuring the combining ability of the commercial generations; Step 4: Analyzing the data of the commercial generations; Step 5: Measuring the meat quality of the commercial broilers; Step 6: Analyzing the production performance of the commercial generations and their parent generations according to Step 3; By measuring the combining ability of the parent generation of Kebai chickens, corresponding commercial generations are screened out, and the performance of the commercial generations is measured. The analysis results show that the egg production of 66-week-old breeding chickens is 5-8 fewer eggs than that of high-yielding commercial laying hens, while the various performance characteristics of the commercial generations are more than 10% higher than those of "817". The breast and leg muscles are basically similar to those of "817", and the meat quality also has a significant advantage. The breeding benefits are significant, and it has good market promotion prospects.

The invention relates to a compound preparation for increasing the laying rate of laying hens. The compound preparation is mainly prepared from the following raw materials by weight: 6-8 g of methionine, 5-10 g of lysine, 3-6 g of calcium hydrophosphate, 1-3 g of cod-liver oil, 4-6 g of probiotics, 5-8 g of vitamin C, 5-8 g of bighead atractylodes rhizome, 5-8 g of ligusticum wallichii, 5-8 g of achyranthes bidentata, 5-8 g of radix rehmanniae recen, 5-8 g of rhizoma cyperi, 5-8 g of Chinese wolfberry, 6-10 g of pine needles and 100 g of a culture medium. The culture medium is prepared from 3-5 g of glucose, 1-3 g of peptone, 0.5-1.5 g of sodium chloride, 0.3-0.5 g of beef extract and purified water added to 100 g. The compound preparation is scientifically and reasonably matched according to the nutrition requirement and the body function conditioning requirement in the egg laying process of chickens, the immunity and reproductive performance of the body can be enhanced, the gastrointestinal tract is conditioned, the food consumption is increased, and growth and development are promoted.

A method for promoting ovarian development of pelteobagrus vachelli belongs to the technical field of fish culture, and is characterized in that in the pelteobagrus vachelli culture process, a functional additive is fed at the ovarian development preparation stage and the ovarian development strengthening stage, and the functional additive is prepared by mixing epigallocatechin gallate and compound unsaturated fatty acid, adding the compound unsaturated fatty acid into the mixture, and stirring to obtain the functional additive for promoting the ovarian development of the pelteobagrus vachelli. Beta-cyclodextrin is firstly adopted for inner layer embedding, then chitosan is adopted for outer layer coating, the microcapsule is prepared, and the composite unsaturated fatty acid is composed of monounsaturated fatty acid and polyunsaturated fatty acid according to the volume ratio of (0.8-1): (1-1.2). EGCG and compound unsaturated fatty acid are compounded and embedded to prepare microcapsules, the microcapsules are added into feed for feeding, ovarian development of pelteobagrus vachelli is effectively promoted, the number of oocytes of pelteobagrus vachelli is increased, meanwhile, the cell proportion of III-stage oocytes is increased, the reproductive capacity of pelteobagrus vachelli is effectively improved, the survival rate of pelteobagrus vachelli is increased, and the survival rate of pelteobagrus vachelli is increased. The egg laying amount, the fertilization rate and the hatching rate are improved.

The present application relates to a kind of feed additive for improving fatty liver of post- laying hen and its preparation method and application method, belong to livestock and poultry feed processing technical field.For the single component additive effect of post- laying hen fatty liver is limited, and lack of the plant combination with synergistic effect screened from local characteristic plant resources.The feed additive provided by the present application comprises the ethanol extract of the mixture of small Xianggou root, tea leaf piece and San Ye Qing tuber, and the weight ratio of small Xianggou root, tea leaf piece and San Ye Qing tuber is (4.0-4.2) : (3.3-3.4) : 2.6.The additive can systematically improve the liver lipid metabolism of post- laying hen, reduce the triglyceride and total cholesterol levels in liver and serum, relieve fatty liver hemorrhagic syndrome, and improve egg production rate and egg quality.The additive is mainly used for post- laying hen feed to improve liver health and maintain production performance.

Provided herein are poultry diets comprising a phytase polypeptide or fragment thereof, wherein the diet is free or substantially free of inorganic phosphate.

The invention discloses a zhou chicken molecular marker genotype and phenotype correlation analysis and breeding method. The method comprises the following steps: firstly, collecting zhou chicken samples, recording growth, slaughter and reproduction phenotype indexes, extracting genome DNA, screening specific SNP markers on GH, IGF-1 and PRL genes, judging genotypes through PCR amplification and Sanger sequencing, and screening AA (GH), GG (IGF-1) and TT (PRL) dominant genotypes through GLM model correlation analysis; and screening a core parent based on the dominant genotype, and carrying out artificial hybridization, hatching egg incubation, chick breeding, offspring genotype and phenotype double screening and multi-generation breeding to obtain an excellent new strain. According to the new strain, the weight of the 12-week-old cocks is larger than or equal to 1650 g, the weight of the hens is larger than or equal to 1300 g, the slaughter rate is larger than or equal to 88%, the first laying day age of the hens is smaller than or equal to 140 d, the annual egg yield is larger than or equal to 200, the growth speed and the annual egg yield are increased by 25% and 18% respectively compared with a traditional variety, the problems that traditional breeding is long in period and low in accuracy are solved, and accurate and efficient breeding is achieved.

The application provides alligator feed, an alligator feeding method and application, and relates to the technical field of alligator breeding. The alligator feed with high meat yield rate comprises fish, fish meal, vitamins, calcium powder, medicinal materials and probiotics; the fish meal comprises fish, shrimps and land animal meat; and the medicinal materials comprise at least one of malt, houttuynia cordata and hawthorn. Through the alligator feeding method, the alligator feed is fed, the meat yield rate, the egg production rate of alligators, and the fertilization rate and the hatching rate of alligator eggs are improved, the alligator feeding system has high economic benefits, and the preparation method of the alligator feed is simple and efficient.

The present invention provides an application of a polypeptide in the preparation of a feed additive for reducing the expulsion stress response of poultry, and belongs to the field of feed technology. The present invention finds through in vitro tests that duck heat shock regulatory factor 3 polypeptide can significantly reduce the heat stress response of duck small intestinal epithelial cells, and improve the ability of duck small intestinal epithelial cells to cope with cell apoptosis caused by heat stress; and can improve the oxidative stress of duck small intestinal epithelial cells caused by ultraviolet light irradiation, reduce the cell MDA level, and increase the cell SOD level. The present invention finds through clinical trials that duck heat shock regulatory factor 3 polypeptide as a feed additive can effectively reduce the impact of expulsion stress on the egg laying rate of chickens, ducks, and geese, significantly improve the egg laying rate of laying poultry under expulsion stress environment, and increase the benefits of laying poultry breeding.

The invention relates to the technical field of aquaculture, and particularly discloses a movable Chinese softshell turtle floating spawning site and an application method.The movable Chinese softshell turtle floating spawning site comprises a bottom plate, a spawning room frame structure is detachably arranged on the bottom plate, and a spawning room is formed in the space between the spawning room frame structure and the bottom plate; a floating cavity and a buoyancy piece are arranged at the bottom of the bottom plate, a positioning assembly is arranged at the bottom of the floating cavity, and a fixing anchor assembly is arranged at the bottom of the positioning assembly. A frame-shaped inlet and a frame-shaped outlet are formed in the opposite sides of the spawning room frame structure respectively; a house entering ladder is arranged at the frame-shaped inlet; a house outlet ladder is arranged at the frame-shaped outlet, and the surface of the house outlet ladder is a smooth inclined plane; a lifting structure is arranged on the oviposition room frame structure, a plurality of single-layer oviposition plates are detachably arranged on the lifting structure, oviposition cavities are formed in the single-layer oviposition plates, and landslide sections for guiding the oviposition cavities are arranged on the single-layer oviposition plates; a climbing section for guiding the oviposition cavity is arranged on the single-layer oviposition plate. The device has the advantages of being movable in setting mode, good in flexibility and low in moving cost.

The present application relates to the technical field of feed, and discloses a kind of Chinese grain amaranth fermented feed of laying hen and production method thereof.The present application is through the deep cooperation of lactic acid bacteria in Chinese grain amaranth silage and exogenous high-activity yeast, makes pH value stable at 4.5~4.9, makes shelf life from less than 1 month to more than 5 months, effectively solves the industry pain point that fermented feed is easy to mildew, adds detoxification cottonseed meal or fish meal to compensate 0.45% egg methionine, cooperates fermentation process to make protein utilization rate increase to 68%, ensures that the egg laying rate of laying hen is stably maintained at more than 90%, utilizes Chinese herbal medicine compound powder to efficiently release active ingredients in acidic fermentation environment, controls the incidence of oviduct inflammation of laying hen to be less than 5% and significantly improves eggshell quality, by introducing fine bran as water absorption adjusting carrier, the moisture content of finished product is controlled at 40%-42% and the flowability is more than 92%, completely solves the industrialization adaptation problem that equipment is frequently blocked in fully automatic production line.

The present invention belongs to the technical field of poultry breeding, and provides the application of royal jelly acid in feed additives for laying hens: adding 0.1%-0.3% royal jelly acid to the feed of laying hens can improve the egg production rate of laying hens. Royal jelly acid can improve the antioxidant capacity of the ovaries and increase the level of reproductive hormones after feeding laying hens, and has the effect of significantly improving the egg-laying performance and eggshell strength of laying hens, especially laying hens in the late egg-laying period. Royal jelly acid is a naturally occurring active ingredient and is a safe and green feed additive. The residue in eggs will not cause harm to human health, but can increase the added value of eggs. The present invention provides a safe and green additive for improving egg-laying performance and eggshell quality, which can be applied to the laying hen breeding industry to solve the current problems of decreased production performance and eggshell quality of laying hens in the late egg-laying period.

The invention discloses a poultry feed using purple-leaf rice straw and application of the poultry feed in the field of poultry feeds, the poultry feed is a mixture of basic feed and silage purple-leaf rice straw, and a preparation method of the silage purple-leaf rice straw comprises the steps that the purple-leaf rice straw is cut up, and then the obtained crushed purple-leaf rice straw is subjected to sealed fermentation treatment to obtain the silage purple-leaf rice straw. The length of the crushed purple-leaf rice straw is 3-5 cm, the water content is 60-70%, the fermentation temperature of the sealed fermentation is 15-30 DEG C, the fermentation time is 40-50 days, and the mass ratio of the silage purple-leaf rice straw in the poultry feed is 5-10%. The poultry feed utilizing the purple-leaf rice straw not only provides a high-added-value recycling means for the purple-leaf rice straw, but also can improve the poultry feeding effect in multiple aspects, and has outstanding practical value in the poultry feeding field.

The invention discloses a formula of an additive for feeding egg-laying ostriches. The formula consists of composite vitamins and a plurality of mineral substances. The special additive formula for the egg-laying ostriches mainly aims to effectively prevent and treat the unhairing phenomenon of the egg-laying ostriches, reduce the stress response of the egg-laying ostriches, better supplement vitamins and minerals to the ostriches, and promote the growth and development of the ostriches, and is comprehensive in nutrition. The feed additive is a vitamin type additive, so that the feed additive is simple in feeding mode, is suitable for being added into various feeds, and can be independently fed. The method is low in cost and suitable for batch production.

The application relates to the technical field of feed additives, and particularly discloses a feed additive for laying hens, a feed for laying hens and a preparation method thereof. The feed additive for laying hens specifically comprises the following components in parts by weight: 120-140 parts of ligustrum lucidum, 120-140 parts of angelica sinensis, 100-120 parts of chuanxiong rhizome, 100-120 parts of astragalus root, 80-100 parts of curcuma longa, 80-100 parts of tagetes erecta, 60-80 parts of hippophae rhamnoides, 60-80 parts of hippophae rhamnoides leaf, 60-80 parts of cuscuta chinensis, 60-80 parts of rhodiola rosea, 20-40 parts of cordyceps militaris and 30-50 parts of a stabilizer; the stabilizer is composed of zeaxanthin, glucosinolate and flaxseed gum in a weight ratio of 20-40:10-20:5-10. The feed additive for laying hens and the feed for laying hens provided by the technical scheme can obviously improve the egg production rate of the laying hens and obviously improve the quality of the eggs.

The present invention discloses a Clostridium perfringens phage PM11, a phage composition thereof and an application thereof. The Clostridium perfringens phage PM11 for preventing and controlling poultry bacterial diarrhea has a preservation number of CGMCC No. 22372. The phage was deposited in the China General Microbiological Culture Collection Center on April 12, 2021. The present invention also discloses a phage composition formed by combining the Clostridium perfringens phage PM11 with Escherichia coli phage PD205 and Salmonella phage PC192. The above-mentioned Clostridium perfringens phage and phage composition can be used as an active ingredient for effectively preventing and treating poultry bacterial diarrhea, and can also be used as an environmental disinfectant to effectively control the pollution of the breeding environment. Compared with a single lytic phage, it has the characteristics of a wide lysis spectrum, which broadens the bactericidal range and improves the bactericidal activity.