68 results about "Grower pig" patented technology

Disclosed are methods of administering at least two Bacillus strains to a pig, such as female breeding stock, nursery pigs, or other pigs. The Bacillus strains inhibit Clostridium in litters borne to the pig. The Bacillus strains also are useful when administered to herds lacking symptoms of Clostridium infection. Administration of the Bacillus strains improves performance of female breeding stock and in piglets borne by the female breeding stock.

The invention relates to a concentrated feed for barren sows, and per 1,000 parts by weigh of the concentrated feed comprises the following raw materials in parts by weight: 490 to 510 parts of puffed bean pulps, 240 to 260 parts of puffed soybeans, 70 to 90 parts of fish meals, 3 to 5 parts of microbial ecological agents, 15 to 25 parts of glucoses, 35 to 45 parts of mountain flour, 35 to 45 parts of calcium hydrophosphate, 10 to 20 parts of table salt, 3 to 4 parts of sodium bicarbonate, 3 to 7 parts of composite trace elements, 0.6 to 0.7 parts of chromium picolinate, 5 to 8 parts of compound amino acid, 0.006 to 0.01 parts of folic acid, 0.9 to 1.5 parts of boar composite many-dimensions, 0.3 to 0.4 parts of vitamin E, 1 to 2 parts of vitamin C, 0.9 to 1.5 parts of beta-carotene, 1 to 2 parts of flavoring agents, 0.09 to 0.15 parts of phytase, 1 to 2 parts of ethoxy quinoline, 2 to 3 parts of choline chloride, and the balance of carriers. In case of adding 30 percent of the concentrated feed into daily fodders for sows, the interval time from ablactation to oestrus can be shortened, thereby improving the oestrous rate, litter size and the like of the sows.

The invention relates to the fields of molecular biotechnologies and molecular marker technologies, in particular to a single nucleotide polymorphisms (SNP) molecular marker located on a porcine chromosome 1 and related to daily gain of a pig and application of the SNP molecular marker. The SNP site marked by the SNP molecular marker located on the porcine chromosome 1 and related to the daily gain of the pig corresponds to 162192627 T>C mutation on the chromosome 1 of an international porcine genome 11.1 version reference sequence. By optimizing a dominant allele of the SNP, the dominantallele frequency can be increased by generations, the daily gain of the pig is increased, pig genetic improvement development is accelerated, and thus economic benefits of pig breeding are effectivelyincreased.

The invention provides a p porcine pseudorabies virus and vaccine composition and applications thereof, belonging to the field of biotechnology. The microbial preservation number of the porcine pseudorabies virus PRV-JS strain is CGMCCNO.6604. The invention further provides a vaccine composition which comprises an inactivated porcine pseudorabies virus PRV-JS strain and adjuvant acceptable on veteriary pharmacy. The vaccine composition further comprises a carrier acceptable on the veterinary pharmacy. The porcine pseudorabies virus PRV-JS strain is screened from porcine pseudorabies prevalent strains separated from all pig farms and has good immunogenicity, and can be used as inactivated vaccine production virus seeds or virus seeds for testing. After being immunized by the vaccine composition, pigs have higher produced antibody level and the lasting period is long. The vaccine composition prepared by adopting the porcine pseudorabies virus PRV-JS strain can be used for preventing the sow abortionbreeding difficulty and mortality syndromeboar infertility caused by the porcine pseudorabies virus, boar infertility and pseudorabies of other pigs.

The invention relates to feed set meals for pigs in different physiological stages, and discloses a systematic nutrition scheme for sows to increase the number of market commercial pigs each year, and the benefits of pig farms are improved accordingly. The systematic nutrition scheme comprises a sow fecundity N+ series product, a piglet higher survival rate 7030 scheme, a pig growing and fattening more-profit making V+ series product and matched feeding patterns. According to the sow fecundity N+ series product, healthy reproduction of boars can be guaranteed by providing enough maintenance, growth, reproduction and immunization nutrition. According to the piglet higher survival rate 7030 scheme, the nutritional requirements of pig stocks in each production stage are met by taking a 'comprehensive nutrients + high and balance nutritional levels + high-quality nutrient sources ' scheme into account, the digestive absorption capacity and the intestinal immunity of the pig stocks are improved by guaranteeing the gastrointestinal tract health, and the self immunity of the pig stocks is reinforced by guaranteeing production nutrition and paying close attention to immune nutrition and stress nutrition. The pig growing and fattening more-profit making V+ series product is prepared according to different nutritional requirements of the pigs in different growth and development stages, and the obtained commercial pigs grow fast, low in feed ration and good in meat quality.

The invention relates to a multi-vitamin gunk for poultry and a preparation method thereof and in particular to a multi-vitamin gunk suitable for pigs and production process thereof. Each kilogram gunk contains vitamin A >=32000000 IU, vitamin D3>=10000000 IU, vitamin E>=90 g, vitamin K3>=10 g, vitamin B1>=10 g, vitamin B2>=25 g, vitamin B6>=10 g, vitamin B12 >=75 mg, biotin>=600 mg, folic acid>=5 g, nicotinamide>=100 g, pantothenic acid>=50 g, antioxidant>=5 g, ethoxyquin>=0.75 g, and the rest is rice chaff. The multi-vitamin gunk for poultry lowers feed meet ratio of pigs and improves growing performance and immunity performance. For breeding pigs, the multi-vitamin gunk for poultry can improve breed performance of the pigs, weaning weight and immunity of piglets and survival rate of the piglets.

The invention discloses a system for simultaneously detecting six pig viruses and a special LAMP primer for the system. The system comprises an LAMP complete primer for detecting the six pig viruses and / or a reagent required for LAMP and / or an instrument and / or an amplified product data processor, wherein the amplified product data processor is used for distinguishing whether a to-be-detected sample amplification product obtained through loop-mediated isothermal amplification on a to-be-detected sample through the LAMP complete primer for detecting the six pig viruses comprises a specific amplified product or not. The system for detecting the six pig viruses and the special LAMP primer for the system can meet simultaneous and rapid detection of a pig foot-and-mouth disease virus O / A / Asia type I, a hog cholera virus, a porcine respiratory and reproductive syndrome virus American type, a porcine circovirus type II, a porcine parvovirus and a porcine pseudorabies virus, the detection system is simple in operation, the result is convenient to observe and a strong technical support is provided for epidemic disease monitoring of a pig farm.

The invention discloses an SNP genetic marker related to pig feed conversion in a FA2H gene fragment. Through the identification of a molecular marker ASGA0092975 affecting the weight gain ratio of boar feed, a large effect molecular genetic marker affecting the weight gain ratio of pig feed can be screened; the marker is located at a pig chromosome 6 12904530bp position and belongs to the intronsequence of a FA2H gene, and the position is a C > T mutation, so that the marker is an allele which can reduce the weight gain ratio of the feed; the selection of breeding pigs can be assisted by detecting the genotype of the marker, and a core group can be entered by selecting TT homozygous breeding pigs, so that the weight gain ratio of the feed can be reduced, and feed consumption and breedingcosts can be effectively reduced as well; and in DLY commercial pig groups, the feed weight gain ratio of TT genotype pigs having ASGA0092975 site polymorphism is 0.08 lower than that of CC genotypepigs, and average daily feed intake can be reduced to 187.83 g / day. Thus, the SNP locus can significantly reduce the feed weight gain ratio of domestic pigs; and that T is the allele which can reducethe feed weight gain ratio and the average daily feed intake can be verified.

The invention discloses a MUC4 molecular marker capable of identifying the susceptibility / resistibility to diarrhea of weaned piglet F4 of the western pigs and applicable to the genetic improvement of boars, and the application of the MUC4 molecular marker in breeding anti-diarrhea disease traits of the improved boars. Firstly, an identification of MUC4 polymorphic sites is processed, wherein, g.13383C is greater than T, g.15580A is greater than G, g.21208A is greater than G, and g.26002A is greater than C. Secondly, genotyping determination is applied to each of the polymorphic sites by using the PCR-RELP method. Finally, a haplotype is constructed. The invention detects the four polymorphic sites by the modern molecular biology technique, constructs the haplotype, and selects a favorable haplotype to reserve seeds for individuals by using marker assisted selection (MAS), thus being capable of significantly improving the ability to resist the diarrhea disease of the species weaned piglets and greatly reducing death rate of the weaned piglets.

The invention relates to the technical field of pig farming, and particularly discloses a breeding method for high yield breeding pigs. According to the breeding method, a group subculture breeding method combining opened breeding and closed breeding is adopted, Danxi landrace and landrace foundation groups as well as Yingxi landrace and landrace foundation groups, which are stable, are established by closed breeding, then cross-breeding is performed, YX44 lines which are high in yield of living piggies, good in reproductive performance and high in lean meat factors and growth speed are obtained as female parents, YX55 lines which are high in growth rate, high in lean meat factors and high in yield of living piggies are obtained as male parents, and a high-yield breeding group is established, so that the high yield breeding pigs are obtained. The high yield breeding pigs bred by the method are high in yield of piggies, good in reproductive performance, high in growth speed, high in lean meat factors, and simple and efficient in hybridizing manner.

The invention relates to the field of livestock breeding, in particular to a breeding method for five-line crossbreeding mating lean type boars. The method includes the following steps that S1, Pietrain pigs are selected as paternal line male parents, Duroc pigs are selected as maternal line female parents, and Pietrain*Duroc pigs are obtained through crossbreeding to be used as terminal male parents; S2, Landrace pigs are selected as maternal line male parents, large white pigs are selected as maternal line female parents, and Landrace*large white pigs are obtained through crossbreeding to beused as maternal line progenitor female parents; S3, another Landrace pigs are selected as progenitor male parents to be crossbred with the Landrace*large white pigs obtained the second step, so thatLandrace*(Landrace*large white) pigs are obtained and used as terminal female parents; S4, the Landrace*large white pigs are crossbred with the Landrace*(Landrace*large white) pigs are crossbred, sothat five-line crossbreeding mating lean type boars are obtained. The commercial pork pigs bred through the method are uniform in appearance and high and long in body; the heads of the pigs are in a medium size, and the mouths of the pigs have a medium length and are wide; the backs and waists are flat and straight, bellies are slightly curled, and four limbs are stout; the economic body weight islarge in the market, and meat quality is excellent; production efficiency is high.

The invention relates to a sow raising and breeding method. Through the method, a disperse, random and traditional raising method is converted into concentrated, continuous and balanced assembly line production according to ecological and physiological characteristics of sows, an all-in and all-out process is implemented, and annual balanced production is performed according to the breeding rhythm. The key technology of all-in and all-out production according to the breeding rhythm is estrus synchronization. Estrus synchronization of the sows can be achieved through three methods, namely (1) estrus synchronization of the multiparous sows is achieved through a simultaneous weaning method; (2) estrus synchronization of the sows experiencing the puberty or pregnant sows is achieved through a pen breeding and hormone injection method; (3) estrus synchronization of gilts which are not in the puberty is achieved through a group raising and hormone injection method. The sow raising and breeding method is experience obtained through many years of sow raising, enables the sows to bred regularly, facilitates production and operation management, and enables work to be conducted in an orderly and planned mode.

The invention relates to the technical field of epidemic disease immunization on pig farms, in particular to a method for cleansing epidemic diseases on a scale pig farm. The method comprises the following steps: sampling serum samples of boars in phases and sampling serum samples of piglets according age in days; detecting an immune antibody and an infection antibody; revising an immune process according to results. By adopting the method, the problems involved in prevention and control, particularly immediate cleansing of major epidemic diseases on the scale pig farm are solved, the morbidity and mortality of pig diseases on the scale pig farm are controlled, the immune effect is improved, and the economic benefit is increased.

The invention discloses a boar estrus inducing fence pigsty with replacement gilt monitoring. The boar estrus inducing fence pigsty comprises boar fences, gilt fences, camera equipment for collectingimages and a gilt recognition system, wherein two rows of boar estrus inducing fences in the center of a pigsty are sequentially arranged on one side of the long edge of the center of the pigsty in parallel, and the two rows of boar estrus inducing fences are spaced by 50 cm and arranged on the two sides of a pigsty partition, the gilt recognition system judges estrus behaviors of gilts through asupport vector machine and a three-axis accelerator to confirm estrus replacement gilts. According to the boar estrus inducing fence pigsty with gilt monitoring, guarding breeders can monitor a plurality of pigsties through the gilt recognition system at the same time, the number of guarding breeders can be effectively reduced in a unit area, meanwhile, the feeding amount of replacement gilts is increased, sufficient replacement gilt resources are provided for pig breeding, and the breeding efficiency of the pig breeding is improved.

The invention provides an SNP molecular marker related to residual feed intake of pigs, the site of the SNP molecular marker is the 51519932th nucleotide site on chromosome 14 of international pig reference genome version 11.1, the site is a missense mutation site on a gene CCDC188, and the basic group of the site is T or C. By optimizing the dominant alleles of the SNP, the frequency of the dominant alleles can be increased generation by generation, the remaining feed intake of the boars can be reduced, the excellent boars with the characters can be bred, and the genetic improvement progress of the boars can be accelerated, so that the economic benefit of breeding of the boars can be effectively improved.

The invention discloses feed for enhancing immunity of special commercial big wild boars. Liriope, angelica sinensis and radix codonopsis can enhance the immunity function of animal bodies, benefit stomach, engender liquid, moisturize dryness by nourishing yin, inhibit various kinds of bacteria and enhance the function of a pituitary adrenal cortex system and can prevent the boars from getting crazy, prevent latent heat and increase feed intake in cooperation with cinnamon. Fennel and cortex phellodendri have the effects of eliminating cold to stop pain, regulating the flow of vital energy and harmonizing stomach and can promote intestinal peristalsis and prevent the big boars from eating less, vomiting and having diarrhea. Hawthorns and atractylodes have the function of increasing appetite and can increase the conversion rate of the feed. Perilla stems and radix astragali have the functions of clearing heat, drying dampness, calming and cooling down. Radix stemonae can improve the anti-disease ability, strengthen the right, expel the evil and prevent and cure animal diseases. After the feed is fed to the commercial big boars, the body constitution and mood of the commercial big boars can be regulated; the disease incidence is reduced by 70-80%; the digestible energy is increased by 20-25%; the absorptive amount of crude proteins is increased by 35-40%, and the daily gain of the body weight of the boars is controlled within 550-650 g. Meat fibers of the boars are compact, the fat elasticity is good, the rich protein content in meat is increased by 20-25%, and the linoleic acid content is increased by 6-9%.

The invention provides an SNP (Single Nucleotide Polymorphism) molecular marker related to pig backfat thickness and application thereof, the locus of the SNP molecular marker is the 38161769th nucleotide locus on a chromosome 1 of an international pig reference genome version 11.1, and the basic group of the locus is A or G. By optimizing dominant alleles of the SNP, the frequency of the dominant alleles can be increased generation by generation, the backfat thickness of boars can be reduced, the excellent boars with the characters can be bred, and the genetic improvement progress of the boars can be accelerated, so that the economic benefit of boar breeding can be effectively improved.

The invention belongs to the technical field of pig molecular marker screening, and particularly relates to an SNP molecular marker related to pig fetal distance traits. An accession number is rs328285068; the method comprises the following steps: collecting a Dan-series boar ear sample from a certain pig farm in south of China, extracting genome DNA, carrying out quality detection, performing genotyping by using a GeneSeek Porcine 50K SNP high-density chip to obtain SNP typing data, screening the SNP molecular marker related to the pig fetal distance traits, wherein the nucleotide sequence ofthe SNP molecular marker is shown in the formula of SEQ ID NO: 1, allelic mutation (substitution) of G / A exists at the 51st basic group of the sequence, and the mutation (substitution) causes the nucleotide of the sequence to generate polymorphism. When the 51st nucleotide of the sequence shown in the formula of SEQ ID NO: 1 is A, it is judged that the boar has a shorter fetal distance.

The invention discloses a UCP3 gene and a molecular marker related to a pig intramuscular fat character, and application of the UCP3 gene and the molecular marker. The SNP molecular marker is a G / T mutation positioned on a 2159bp position of a sequence disclosed by SEQ ID NO: 6, and the position of the genome of the SNP molecular marker is a 8387309 site from a 5' terminal of a No.9 chromosome ofa pig 11.1 version. Firstly, in a herd containing 279 experimental pigs, a FastTarget target area sequencing technology is used for authenticating a variation site which affects the content of pig intramuscular fat in the gene, and a PCR-RsaI-RFLP gene quick parting method which aims at the site is established. On the basis, in the herd containing 500 pigs, an application effect of the site for increasing the intramuscular fat is verified, a result indicates that through selection of a favorable genotype of the site, the content of the pig intramuscular fat can be obviously improved, and theauthenticated variation site can be used for early-stage, living-body and quick marker aided selection of the pig intramuscular fat.

The invention discloses a method for detecting sow total-number-born character-correlated mutant alleles and a reagent kit thereof. The method provided by the invention comprises the following step of: determining whether the genotype of a sow to be detected is TT or CT by detecting whether the 2348th-bit deoxyribonucleotide of the sow GenBank Accession Number EU407778 to be detected is T or C, wherein the number born of the sow in the TT genotype is higher than that of the sow in the CC genotype, the TT genotype is the homozygote of the GenBank Accession Number EU407778 with the 2348th-bit deoxyribonucleotide as T from a 5' terminal, and the CC genotype is the homozygote of the GenBank Accession Number EU407778 with the 2348th-bit deoxyribonucleotide as C from the 5' terminal. Pigs are bred by applying the method provided by the invention, and the early screening for the pigs to be selected can be carried out, thereby effectively relieving the problem of long time for selecting excellent boars in actual production, lowering the breeding expenses, effectively increasing the total number born of the pigs in the actual production, improving the economic benefit, realizing the automated detection and exerting a great action in pig breeding.

The invention discloses a foster care type boar introduction method. The foster care type boar introduction method includes the steps that a piglet, meeting the following conditions, in an introduced farm is selected, wherein the piglet is a healthy piglet fed with colostrums of a birth sow, the piglet is two to four days old, and a foster care sow must meet the conditions that parturition is finished or is finished less than three days; the introduced piglet is washed and disinfected; intraday urine of the foster care sow is smeared or sprayed to the introduced piglet; disinfectants the same as disinfectants used for the introduced piglet is used for disinfecting the foster care sow; then the introduced piglet and the foster care sow are fed together. By means of the foster care type boar introduction method, introduction of excellent genes of boars can be achieved; in addition, disease threats caused by introducing the large-weight boars are well avoided, and the introduction success rate is high; in addition, concentrated production and balanced breeding can be achieved to a certain degree.

The invention provides an SNP (Single Nucleotide Polymorphism) molecular marker related to pig residual feed intake on a pig chromosome 1 and application thereof, the locus of the SNP molecular marker is the 34718602 nucleotide locus on the chromosome 1 of the international pig reference genome version 11.1, and the basic group of the locus is A or C. By optimizing dominant alleles of the SNP, the frequency of the dominant alleles can be increased generation by generation, the residual feed intake of boars can be reduced, the excellent boars with the characters can be bred, and the genetic improvement progress of the boars can be accelerated, so that the economic benefit of breeding of the boars can be effectively improved.

The present invention discloses a new nutrient-rich feed for pigs and relates to the field of feeds. The feed for the pigs comprises the following composition in ratios (parts by mass): 10-15 parts of millet flour, 7-10 parts of wheat bran, 8-13 parts of straw powder, 9-14 parts of soybean cake, 5-9 parts of rice bran, 6-11 parts of fish meal, 10-17 parts of edible salt, 4-9 parts of premixes, 7-12 parts of soybean oil, 9-12 parts of compound vitamins, 7-10 parts of emulsified fat powder, 3-7 parts of calcium dihydrogen phosphate, 6-11 parts of glucose powder, 4-9 parts of dried porcine solubles, 5-8 parts of sodium butyrate, 7-12 parts of lysine, 6-12 parts of threonine, 5-9 parts of methionine and 5-10 parts of accessory ingredients. The present invention also discloses a preparation technology of the new nutrient-rich feed for the pigs. The preparation technology comprises the following four technological steps: mixed raw material A preparing, granulating, drying and finished product obtaining. The preparation technology of the new nutrient-rich feed for the pigs is scientific and reasonable, simple in the preparation technology, low in costs, full of nutrition, green and safe, and environmentally friendly, and increases the lean meat rate. The feed for the pigs is suitable for mass production and greatly improves the feeding economic benefits.

The invention belongs to the technical field of pig feeding management, and discloses a feeding management method for improving production performance of ternary sows, which remarkably improves the production performance of the ternary sows and increases the breeding benefits of fattening pigs as breeding pigs. The method mainly comprises the following five steps: step 1, a feeding management method in the reserve period; step 2, a feeding management method in the early stage of pregnancy; step 3, a feeding management method in the middle stage of pregnancy; step 4, a feeding management method in the late period of pregnancy; and step 5, a feeding management method from the lactation period to the post-weaning oestrus. By adopting the technical scheme to feed the ternary sows, the three breeding problems that the ternary sows have small number of piglets and insufficient milk and are not obvious in oestrus can be effectively solved, and the ternary sows can produce 3-4 healthy piglets per birth on average.

The invention discloses a forage feed used in the nonpregnant stage of boars. The feed comprises the materials by weight percent: 60-70% of forage powder, and the balance being auxiliary materials, wherein the auxiliary materials comprise the materials by weight parts: 20-30 parts of corn, and 5-15 parts of bran. As a forage material is added in an existing forage feed used in the nonpregnant stage of the boars, the secretion of various digestive glands of the boars can be stimulated, and after the forage powder is added, the forage is used for supplementing the insufficient of the contents of protein and calcium in the forage powder, and supplementing vitamins and mineral substances; the feed has the characteristics that the utilization rate of the forage powder is increased, the digestion rate is high, and the nutritive value is improved. As the forage feed adopting the materials is used for the boars in the nonpregnant stage, the fertilization rate of the boars is increased, and the heath conditions of the boars can be improved.

The invention relates to a compound feed for lactation sows and a preparation method of the compound feed, and belongs to the technical field of a pig feed. The compound feed comprises the raw materials of corn, soybean meal, corn germ meal, DDGS, rice bran meal, calcium hydrogen phosphate, stone powder, edible salt, complex vitamins for breeding boars, trace elements for breeding boars, soybean oil, an antioxidant, a solid mildewproof agent, a sweetening agent, high temperature resistant phytase, choline chloride, bile acid, and heat resistant stress additive, wherein the heat resistant stress additive comprises the raw materials of threonine, arginine, vitamin C, gamma-aminobutyric acid, and a bacillus subtilis microecological preparation. According to the compound feed for lactation sows, the food consumption of bodies of the sows can be increased, the intake quantity of nutrients is increased, mammogenesis is promoted, heat stress of the bodies of the sows can be relieved, the conversion rate of the compound feed is increased, and comprehensive production performance of the bodies of the sows can be improved. According to the preparation method of the compound feed, steam granulation and rotary drying for two times are adopted, so that the surface heating uniformity of the compound feed is improved, and the compound feed is simple to prepare, convenient to shape and convenient to control.

The invention relates to the technical field of genetic engineering, in particular to a method for breeding Sujiang boars, the application of serpinA3 gene and / or vitaminectin gene in breeding Sujiang boars, and a method for breeding Sujiang boars kit. The present invention discovers for the first time the functional relationship between the serpinA3 and vitaminectin genes and the feed efficiency of Sujiang breeding pigs. By applying the serpinA3 and vitaminectin genes to the breeding of Sujiang breeding pigs, breeding pigs with high feed efficiency can be bred to improve Sujiang breeding pigs. Economic benefits of ginger pig farms.

The invention discloses a multifunctional automatic medicine adding system special for a farm. The multifunctional automatic medicine adding system comprises a discharging device and a screening cylinder, wherein a feed port and a medicine inlet are formed in the discharging device, a rotating shaft is arranged in the discharging device, and a discharge port is formed in the bottom of the discharging device and communicated with the top end of the screening cylinder; a rebounding plate is obliquely arranged in the screening cylinder, a vertical sieve plate used for screening feed particles isarranged below the rebounding plate, and a coarse feed valve and a refined feed valve are arranged at the bottoms of the two sides of a partition plate in the screening cylinder and each internally provided with a stirrer. By means of screening feed through the structure, boars in different stages are fed on different feeds, medicine is added into the feed and stirred, the medicine absorbing rateof the boars is increased, the timing and quantitative feed putting function can be achieved, different discharging valves are switched to add feed to troughs in a pigsty, and feeding efficiency is greatly improved.

The invention discloses a feeding technology for improving the reproductive capacity of boars. Through diversified feed, nutrition complementation is achieved, feeding needs to be conducted regularly and quantitatively, the breeding body condition of the boars is guaranteed, the boars are prevented from being too fat or too lean, finally, physiological acid feed is additionally fed in a proper amount, the semen quality is improved, the mating success rate is increased, and the balance among nutrition, exercise and mating is kept. The mating capacity of the boars is improved, the semen quality is improved, the first mating day age and the weight of replacement gilts are controlled, repeated mating is implemented, feeding management is enhanced, the heritability of the gilts is exerted to the maximum extent, the replacement gilts grow and develop better, and accordingly the high oestrus rate and conception rate are obtained. High-energy feed is supplied to the replacement gilts 10-14 days before mating, so that the effects of increasing the ovulation number and improving the ovum quality are achieved. The feeding technology solves the problems that the feeding management level of pigs is low and the breeding potential of the boars is low.