Breeding method and application of short-legged black-legged chicken
By breeding the D, E, and C lines and introducing dwarf and black-footed genes, the problem of yellow-feathered broilers not adapting to the Southwest market has been solved. This has enabled the breeding of dwarf and black-footed chickens with fast growth, high feed conversion rate, and strong disease resistance, thus meeting the needs of the Southwest market.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FOSHAN CITY GAOMING DISTRICT XINGUANG AGRIAND ANIMAL HUSBANDRY
- Filing Date
- 2026-04-14
- Publication Date
- 2026-07-10
AI Technical Summary
The existing yellow-feathered broiler chickens are not suitable for the market demand in Southwest China. They have a slow growth rate, low feed conversion rate, and lack the black-foot gene, which leads to a decline in production performance. Existing breeding methods are not applicable.
By breeding the D, E, and C lines as the first paternal line, terminal paternal line, and maternal line respectively, and using dwarf yellow chickens, black-legged hemp chickens, and recessive white-locked chickens for hybridization and backcrossing, dwarf and black-leg genes are introduced and stably inherited, resulting in dwarf and black-legged chickens with strong adaptability, fast growth rate, and high feed conversion rate.
The bred dwarf and black-footed chickens are adapted to the market demand in Southwest China. They grow quickly, have a high feed conversion rate, and are highly resistant to disease. They meet the market's requirements for the nutritional value and flavor of black-footed chickens, reducing the area of breeding chicken houses and minimizing environmental damage.
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Figure CN122350031A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of poultry breeding technology, and in particular to a method for breeding and applying dwarf and black-footed chickens. Background Technology
[0002] The existing yellow-feathered broiler chickens have the disadvantage of yellow feet, which is not suitable for the demand for black-footed chickens in Southwest China. The growth rate of commercial chickens is not fast enough, making it difficult to meet the social demand for fast-growing broiler chickens, and the feed conversion rate is low. Since the existing breeding lines do not contain the gene that shows black feet, the production performance is degraded. It is necessary to introduce new lines to improve the growth rate. The existing breeding methods are no longer applicable, and it is necessary to innovate better breeding methods that meet the needs of the breed and improve feed conversion rate. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides a method for breeding dwarf and black-legged chickens, comprising the following steps: The D, E, and C lines were cultivated separately, with the D line as the first paternal line, the E line as the terminal paternal line, and the C line as the maternal line. Breeding the first paternal line D: Dwarf yellow chickens and black-legged hens are crossbred in both directions. The hens from the crossbred chickens are then crossbred with the roosters from the reverse crossbred chickens. Roosters and hens with shorter legs and darker shank color are selected and crossbred to fix them. The purebred generation roosters from the crossbred chickens are then crossbred with black-legged hens. The crossbred hens are then backcrossed with the purebred generation roosters. The resulting roosters and hens are then crossbred to fix them. The offspring form the first paternal line D of dwarf and black-legged chickens. The dwarf yellow chicken is derived from the A strain bred using the breeding method described in application number 2017107629357; Breeding of terminal paternal line E: Using the Black-footed Ma Chicken breed as material, after establishing a stable basic population, terminal paternal line E is formed; Breeding of Dwarf and Black-legged Chickens: Using recessive White Rock chickens as the maternal line C, the first paternal line D is crossed with the maternal line C to obtain the parent generation. The parent generation hens are then crossed with the terminal paternal line E to breed Dwarf and Black-legged chickens.
[0004] Addressing the issue of yellow-legged chickens in existing breeds, the most challenging aspect of this invention is introducing the black-legged gene into yellow-legged chickens and ensuring its stable inheritance in offspring. Since this system comprises three strains, two strains must be black-legged, and one yellow-legged (recessive, not expressing leg color) to maintain the black-legged trait in commercial chickens. Therefore, this invention introduces a fast-growing black-legged chicken (called "Iron-legged Ma Chicken") strain E. This strain is then crossbred with existing dwarf yellow chickens and bred in a closed-loop system for three generations to continuously purify the leg color, fixing the black legs, and then creating the dwarf black-legged strain D. Finally, using recessive White Locker chickens imported from Kabire in Israel, a second-generation testcross is conducted to create the strain C. Through these selective breeding methods, this invention achieves the advantages of producing commercial chickens adapted to markets in Southwest and Northern China: black legs, white meat, fast growth, and high feed conversion ratio.
[0005] In one embodiment, the dwarf yellow chicken contains a sex-linked dwarf gene, and its physical characteristics include: short legs and yellow legs.
[0006] In one embodiment, the physical characteristics of the black-footed chicken include: black feet and long legs.
[0007] In one embodiment, the black-footed chicken is derived from the Guangxi iron-footed chicken.
[0008] In one embodiment, the physical characteristics of the first paternal line D-line adult chicken include: mottled feathers, black legs, and short legs.
[0009] In one embodiment, the physical characteristics of the first paternal line D-line adult chicken include: mottled feathers, black legs, red single comb, bright red face, wattles and earlobes, shiny mottled red feathers, short legs, round body shape, and docile temperament.
[0010] In one embodiment, the physical characteristics of the terminal paternal line E-line adult chicken include: large body size, mottled feathers, and black feet.
[0011] In one embodiment, the physical characteristics of the terminal paternal line E-line adult chicken include: large body size, mottled feathers, black feet, red single comb with 5-7 comb teeth, bright red face, wattles and earlobes, compact and shiny feathers, and robust physique.
[0012] In one embodiment, the recessive White Rock chicken was obtained by selectively breeding recessive White Rock chickens imported from the Israeli company KABIR after removing the dominant white feather gene through second-generation testcrosses.
[0013] In one embodiment, the physical characteristics of the adult chickens of the maternal C line include: well-developed pectoral and leg muscles, thick shanks, and a tall and robust body.
[0014] In one embodiment, the physical characteristics of the adult chickens of the maternal C line include: a plump, ingot-shaped body, a single upright comb, bright red comb, face, wattles and earlobes, yellow skin and shanks, black irises, well-developed pectoral and leg muscles, thick shanks, and a tall and robust body.
[0015] In one embodiment, the parent generation of adult hens is a short-bodied, fast-feathered strain with well-developed breast and leg muscles, and black beaks and shanks.
[0016] In one embodiment, the adult hens of the parent generation are short-bodied, fast-feathered breeds with a symmetrical body shape, short and round body, delicate head, docile temperament, compact feathers, well-developed breast and leg muscles, and the vast majority of them have mottled feathers, with a small portion having light mottled feathers. The tail feathers, primary wing feathers, and secondary primary wing feathers are mottled black, the single comb is upright, and the comb, wattles, and earlobes are bright red. The beak and shanks are black.
[0017] In one embodiment, the adult roosters of the parent generation are of the fast-feathered strain, which are large in size, with thick shanks and well-developed pectoral and leg muscles.
[0018] In one embodiment, the adult roosters of the parent generation are of the fast-feathered strain, which are large and robust, with reddish-brown, compact and glossy feathers, a deep chest and broad back, thick shanks, well-developed breast and leg muscles, mottled black tail feathers, primary wing feathers and secondary primary wing feathers, a single upright comb, and bright red comb, earlobes and earlobes.
[0019] A second aspect of the present invention provides the application of the above-described breeding method in the breeding of dwarf and black-footed chickens.
[0020] The key points of this invention are: 1. Introduction of the dwarf gene: The existing E-strain Iron-Legged Ma chicken breed has normal legs (tall legs). It is necessary to introduce the dwarf gene (dw gene) and solve a series of problems caused by the dwarfing effect. The introduction of the dwarf gene requires reciprocal crosses, and after segregation in the offspring, the dwarf chickens are selected for retention. 2. Fixation of the black-leg gene: Crossbreeding black-legged chickens with yellow-legged chickens produces few black-legged chickens, requiring several generations of purification. The most difficult breakthrough in this invention is that the selected chickens must contain the dw dwarf gene and also express black legs. The existing breeds only contain the dwarf gene, which does not meet the market demand for black-legged chickens, so an improvement scheme is needed.
[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The introduction of the dwarf gene has advantages such as lower feed consumption and higher feed conversion rate compared with other normal-type Iron-legged Ma chickens. Under the condition that the total number of chicks produced remains unchanged, the area of the breeding chicken house can be reduced by 33.3%, thereby reducing the environmental damage caused by expanding the chicken house and achieving obvious ecological benefits.
[0022] 2. The introduction of the black-footed gene aligns with market perceptions of black-footed chickens for their high nutritional value and excellent flavor. Furthermore, they offer advantages such as rapid growth, good uniformity, strong disease resistance, high feed conversion rate, and low feeding costs, making them popular among farmers. Attached Figure Description
[0023] Figure 1 Illustrated procedures and methods for breeding dwarf and black-legged chickens; Figure 2 Images of male and female hens from the D, C, and E series; Figure 3 Images of roosters used as substitutes for parents; Figure 4 Images of surrogate hens for parents; Figure 5 Group photos of product representatives; Figure 6 This is a diagram illustrating the seed production process of the first paternal line, D. Figure 7 This is a diagram illustrating the process of breeding commercial broiler chickens. Detailed Implementation
[0024] This invention successfully bred a new dwarf black-legged Ma chicken strain (D strain) by introducing the bloodline of yellow-feathered dwarf chickens (A strain) into black-legged Ma chickens (also known as Iron-legged Ma chickens, E strain) through several generations of selective breeding. This strain possesses the characteristics of mottled feathers, black legs, short legs, a round body shape, and a docile temperament. To improve the reproductive performance of black-legged Ma chickens, the highly reproductive recessive white-Lock chicken (C strain) was creatively bred with black-legged Ma chickens. The offspring retain the characteristics of mottled feathers, black legs, and white meat, while significantly improving reproductive performance. By introducing recessive white genes and sex-linked dwarf genes, not only are the excellent qualities of local Chinese chicken breeds maintained, but they also possess high-yield and high-efficiency characteristics. The parent breeder chickens produce a high egg production, and the commercial offspring have strong disease resistance and good meat quality.
[0025] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0027] Unless otherwise specified, all reagents, materials, and equipment used in this embodiment are commercially available; unless otherwise specified, all test methods are conventional test methods in this field.
[0028] Example 1 This invention provides a method for breeding dwarf and black-legged chickens, comprising: 1. Seed production process of the first paternal line, D line A reciprocal cross was conducted between the A strain of dwarf yellow chickens and the E strain of black-legged hens. The offspring were 50% A, 50% E, 50% A. The hens from the reciprocal cross were then crossed with the roosters from the reverse cross. Genotype segregation occurred in the offspring. Hens and roosters with shorter legs and darker shank color were selected for crossbreeding to stabilize the pheasant line. Roosters from the first generation of purebred chickens were then crossed with the original black-legged hens. The resulting hens were backcrossed with roosters from the first generation of purebred chickens and crossbred to stabilize the pheasant line. The offspring with black legs and shorter legs were selected for crossbreeding. After three generations of selection, a stable D strain was synthesized. (See details below.) Figure 6 .
[0029] 2. To improve reproductive performance, the highly reproductive Recessive White Locker Chicken (C strain) was creatively bred with the Black-legged Muscovy Chicken. The offspring retained the characteristics of Muscovy feathers and black legs, while their reproductive performance was significantly improved. For details of the breeding process, please refer to [link to breeding program]. Figure 7 .
[0030] (1) Commercial chickens contain the bloodline of dwarf chickens, grow quickly, but have better meat quality than white-feathered chickens, which is suitable for my country's unique consumption habits; (2) They have stronger environmental adaptability, stress resistance and disease resistance than white-feathered broilers, lower management and epidemic prevention costs, and relatively lower feeding and management risks, which is more conducive to the production of green and safe poultry meat; (3) The overall cost of the industrial chain is not much different from that of white-feathered broilers; (4) They have independent intellectual property rights, which is of great significance to promoting the healthy development of my country's characteristic black-footed chicken industry.
[0031] Example 2 Purebred breeding methods 1. First paternal lineage: D lineage This is a D-line dwarf breed of chicken containing the sex-linked dwarf gene (dw): It was developed by reciprocal crosses between dwarf yellow chickens (containing the dw gene) and normal black-legged Ma chickens (2450 mixed chicks imported from Nanning, Guangxi). The resulting females were then crossbred with the males from the reciprocal crosses. The offspring showed phenotypic segregation. Males and females with shorter legs and darker shank color were selected and crossbred to stabilize the phenotypic line. Roosters from the first generation of purebred breeding were crossbred with the original D-line hens. The resulting female offspring were backcrossed with roosters from the first generation of purebred breeding and then crossbred to stabilize the phenotypic line, forming the D-line base population. After establishing the stability of the base population, family lines were established. Adult chickens of this strain have mottled feathers, black legs, a single red comb, and bright red face, wattles, and earlobes (a very small number have single or double white or grayish-white earlobes). Their feathers are glossy mottled red, they have short legs, a round body shape, and a docile temperament. This strain is currently used as the first paternal line in the "dwarf, black-legged chicken" breeding system.
[0032] In this embodiment, the dwarf yellow chicken was bred according to the content described in patent application number 2017107629357.
[0033] 2. Terminal parent: E series This is a fast-growing, black-legged Ma chicken: The breeding method involves introducing the E strain of the fast-growing, large-sized black-legged chicken (known as "Iron-legged Ma chicken") bred in Guangxi, establishing a stable base flock, and then forming family lines. Adult chickens of this strain are large, with mottled feathers, black legs, a single red comb with 5-7 serrations, and bright red face, wattles, and earlobes (a very small number have one or both white earlobes). They have compact, glossy feathers and a robust physique. It is currently used as the terminal paternal line for the "Dwarf Black-legged Chicken" breeding system.
[0034] 3. Maternal line: C lineage This is a recessive White Locker chicken breed, with 10,000 female chicks imported from the Israeli company Kabirr in 1994. After introduction, the dominant white-feather gene was eliminated through second-generation testcrosses, and a foundation population was established in 1998. Family breeding began in 1999. This breed has very pure bloodlines and stable performance, and family selection has been continuously carried out. Adult chickens of this breed have entirely white feathers, a full, ingot-shaped body, a single upright comb, and bright red comb, face, wattles, and earlobes. The skin and shanks are yellow, the irises are black, the breast and leg muscles are well-developed, the shanks are thick, and the body is large and robust. It is currently used as the maternal line for the "Dwarf Black-legged Chicken" breeding system.
[0035] Example 3 Parental reproductive performance The parent hens are small-bodied and belong to the fast-feathering strain. Adult hens are well-proportioned, short and rounded, with delicate heads, docile temperaments, compact feathers, and well-developed breast and leg muscles. The vast majority have mottled feathers, with a small portion having light mottled feathers. The tail feathers, primary wing feathers, and secondary wing feathers are mottled black. They have a single, upright comb, and bright red comb, wattles, and earlobes. The beak and shanks are black. The parent roosters are also a fast-feathering strain. Adult roosters are large and robust, with compact, glossy reddish-brown feathers. They have deep chests, broad backs, thick shanks, and well-developed breast and leg muscles. The tail feathers, primary wing feathers, and secondary wing feathers are mottled black. They have a single, upright comb, and bright red comb, earlobes, and earlobes. Parent hens begin laying eggs at 23 weeks of age, with an average starting weight of 1700g. Hens placed in the coop at 66 weeks lay 175-180 eggs per night. The eggshell is light brown, the egg weighs 55-60g, the qualified rate of hatching eggs is over 95%, the fertilization rate is over 95%, and the hatching rate of eggs put into incubation is over 90%.
[0036] The parent generation primarily provides superior offspring, resulting in excellent production performance for the commercial generation. The breeding goal is to cultivate fast-growing, feed-efficient Iron-legged Ma chickens with strong adaptability, good production performance, and high feed conversion rate, meeting market demands. To improve reproductive performance, the highly reproductive recessive White Locker chicken (C line) is creatively bred with the first paternal line (D line) of dwarf and black-legged Ma chickens. The offspring retain the characteristics of mottled feathers and black legs while significantly improving reproductive performance.
[0037] The adult weight and body size of the parent breeder chickens are shown in Table 1 below: Table 1
[0038] Example 4 Methods for selecting the optimal combination of products To select superior breeding combinations, this invention conducted different hybridization experiments on specialized strains such as the C, D, and E lines. The commercial broiler chickens from each combination were observed for body shape, feather color, precocity, and carcass appearance. Through comprehensive analysis and comparison, the combination determined in this invention, E♂×(D♂×C♀)♀, produces commercial broiler chickens with good body shape, black legs, white skin, feed efficiency, tender meat, rapid growth, high feed conversion ratio, high survival rate, and high uniformity. This combination has achieved excellent breeding results and can be promoted as the optimal breeding combination.
[0039] The "dwarf, black-legged chicken" breeding system of this invention features rapid growth, strong disease resistance, good uniformity, and high feed conversion rate, making it highly favored by farmers. In terms of appearance, this breeding system produces broilers with mottled feathers, black legs, large body size, and glossy, neat plumage, which is popular with consumers. The production performance of this breeding system is shown in Table 2. Table 2
[0040] Example 5 Breeding methods The breeding objective of the "dwarf, black-legged chicken" breeding line produced in this invention embodiment is to cultivate a fast-growing, feed-saving iron-legged Ma chicken with strong adaptability, good production performance, high feed conversion rate, and meeting market requirements. Based on the current development status of Ma chicken breeds and the trend of market diversification, the company selected several groups, including dwarf yellow-feathered chickens, iron-legged Ma chickens, and Israeli recessive White Locker chickens, as breeding materials. Through numerous hybridization experiments and several generations of selection, several specialized strains were developed. After combining ability testing, the best breeding combinations were selected to establish a superior breeding system, and numerous intermediate feeding trials were conducted. Specific procedures and methods are detailed in [link to details]. Figure 1 .
[0041] 1. Establishment of the base group The initial flock's quantitative and qualitative traits were assessed, and individual chickens' body shape, feather color, shank color, comb type, comb color, shank length, and shank girth were observed and measured. Breeding goals were established, and selective traits and standards were determined based on these goals. A strict culling method was used, culling only individuals with good overall performance and meeting the standards to form the foundation flock. After the foundation flock was established, no further bloodlines were introduced, and closed-group breeding was implemented.
[0042] 2. Specialized strain selection Specialized breed development involves paternal and maternal selection, with different focuses for each breed. For maternal breeds, while selecting for individual physical characteristics and growth performance, the emphasis is on improving reproductive performance; for paternal breeds, the focus is primarily on physical characteristics and growth performance. Breeding employs a closed-group family selection method; once the breeding base population is established, no further foreign bloodlines are introduced. Family breeding and pedigree hatching ensure clear kinship among individuals. For multiple traits, independent culling is used, eliminating individuals that do not meet breeding requirements for any particular trait; for single traits, selection methods are based on heritability, using individuals, families, or a combination of individuals and families. Reproductive performance selection utilizes early selection based on egg production at 300 days of age to shorten generation intervals. Molecular detection technology is used in the D strain to identify the allele type of the dw gene, and in the C strain, it is used to identify dominant and recessive white feathering.
[0043] The growth and reproductive performance of each family line were measured to select the best families and individuals to form the core group for the next generation. When selecting families, individual selection was combined with evaluation, eliminating individuals from the selected families based on qualitative traits such as body size and appearance, and quantitative traits such as reproductive performance. Subsequent generations used the same method to select and evaluate families.
[0044] 3. Family lineage formation The initial flock of chickens was separated into male and female groups, and individual records were kept. A breeding method combining family selection and individual selection was adopted, culling chickens that did not meet the requirements in terms of weight, plumage color, leg color, shank length, shank girth, comb shape, body shape, egg production, etc., as well as those that tested positive for pullorum disease and leukosis. Full-sib families were established at a male-to-female ratio of 1:10-12, based on the principle of non-inbreeding, and pedigree hatching was carried out.
[0045] 4. Basic procedures for strain selection and breeding The basic principles of strain selection are family breeding, pedigree incubation, and individual recording. The main selective traits are as follows: Weight: birth weight, weight at 7 weeks, weight at 20 weeks, weight at 44 weeks; Physical characteristics: plumage color, leg color, crest shape, shank length, shank girth, etc.; Reproductive performance: comb development, egg production at 300 days of age, fertilization rate, hatchability; Disease resistance: avian leukosis, fowl pullorum disease.
[0046] General methods for strain selection and breeding: (1) Hatching of hatching eggs: Hatching eggs from different families are placed into the incubator according to the family number. When turning the tray, the hatching eggs of each hen in the family are placed into plastic mesh bags. After hatching, they are weighed and labeled with wing numbers. (2) Selection at 1 day old: For each generation, physical appearance characteristics are the preferred traits (mainly feather color, shank color, etc.), and individuals with mixed feathers and poor development are eliminated; (3) Selection at 7 weeks of age: Weigh and measure the shank length of each rooster in the flock after fasting, calculate the strain mean, family mean, and coefficient of variation, and sort the roosters and hens according to their weight and shank length. Determine the upper and lower limits of weight and shank length according to the breeding standards. Individuals that meet the weight and shank length requirements are then selected on-site in conjunction with their body shape and appearance traits. Individuals that meet the breeding requirements are retained. Individuals with unsatisfactory body shape and appearance, or those that are too large or too small in weight and shank length are culled. (4) Selection of breeding at 20 weeks of age: Weigh each individual in the group on an empty stomach, and measure the tibia length and tibia circumference. Individuals that meet the requirements for weight, tibia length, and tibia circumference are selected on-site in combination with body shape and appearance traits. Individuals that meet the breeding requirements are kept and transferred to individual cages for rearing. (5) Record the individual production performance status, including egg production, broodiness, disease incidence, etc. Based on the statistical results of egg production, egg weight, fertilization rate and hatchability of each family at 300 days of age, select breeding chickens by combining family selection and individual selection within the family, and promptly cull chickens that lay too many deformed eggs, have strong broodiness, or have chronic diseases; (6) Selection of roosters: A small number of roosters were selected, using individual and family selection methods. The first selection was conducted at 7 weeks of age, culling individuals with undesirable body shape and appearance, or those with excessive weight or leg length, according to the breeding objectives. Family and individual selection methods were used for roosters. In the C line, families with the lowest average weight of males and females (ranking in the bottom 20%) were culled; in the D line, families with the lowest average weight of males and females (ranking in the bottom 10%) were culled; and in the E line, families with the lowest average weight of males and females (ranking in the bottom 30%) and individuals with weights below the average rooster weight were culled. A second selection was conducted at 20 weeks of age, primarily selecting individuals with body shape and appearance that met the breeding objectives and robust physiques, transferring them to individual cages. At 23 weeks of age, selection was conducted based on sexual reflexes and semen quality. The selected roosters were then used to establish new families for breeding, following the principle of non-inbreeding. (7) Purification of pullorum disease and leukosis in chickens: Chickens were tested for Salmonella at 17 weeks of age and culled if positive; chickens were tested for leukosis at 20 weeks of age and culled if positive.
[0047] In the process of cultivating this supporting system, this invention incorporates four innovative technologies: (1) Introduce sex-linked dwarfism genes into tall-legged, black-legged Iron-legged Ma chickens; (2) Use molecular techniques to help eliminate breeding chickens containing the dominant white feather gene; (3) The broiler chickens in this product line have well-developed breast and leg muscles, which are suitable for market demand; (4) We have always adhered to strict breeding and application of recessive white chickens to ensure the excellent production performance of the parent generation and the commercial generation.
[0048] In summary, the method for breeding dwarf and black-legged chickens of the present invention is as follows: 1. In response to the ever-increasing overall cost of breeding, we creatively introduced the sex-linked dwarf gene into the Tiejiao Ma chicken breed to cultivate the D strain of the sex-linked dwarf Tiejiao Ma chicken. This results in low feed consumption of the parent breeder chickens, fast growth rate of commercial broilers, high feed conversion rate, good uniformity, and strong disease resistance.
[0049] 2. In order to meet the requirements of the Southwest market for black-footed, white-meat chickens, we used fast-growing iron-footed chickens bred in Guangxi, our own D-strain dwarf chickens, and recessive white-locked chickens imported from Israel as breeding materials. We used closed-family selection and applied the principles of quantitative genetics to conduct a large number of hybridization experiments to develop a matching strain of black-footed, white-meat chickens.
[0050] 3. This technology is independently developed, using existing breeding methods, continuously conducting hybridization experiments, and extracting the optimal combination to adapt to the market.
[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A method for breeding dwarf, black-legged chickens, characterized in that, Includes the following steps: The D, E, and C lines were cultivated separately, with the D line as the first paternal line, the E line as the terminal paternal line, and the C line as the maternal line. Breeding the first paternal line D: Dwarf yellow chickens and black-legged hens are crossbred in both directions. The hens from the crossbred chickens are then crossbred with the roosters from the reverse crossbred chickens. Roosters and hens with shorter legs and darker shank color are selected and crossbred to fix them. The purebred generation roosters from the crossbred chickens are then crossbred with black-legged hens. The crossbred hens are then backcrossed with the purebred generation roosters. The resulting roosters and hens are then crossbred to fix them. The offspring form the first paternal line D of dwarf and black-legged chickens. Breeding of terminal paternal line E: Using the Black-footed Ma Chicken breed as material, after establishing a stable basic population, terminal paternal line E is formed; Breeding of Dwarf and Black-legged Chickens: Using recessive White Rock chickens as the maternal line C, the first paternal line D is crossed with the maternal line C to obtain the parent generation. The parent generation hens are then crossed with the terminal paternal line E to breed Dwarf and Black-legged chickens.
2. The cultivation method according to claim 1, characterized in that, The dwarf yellow chicken contains a sex-linked dwarf gene, and its physical characteristics include: short legs and yellow legs.
3. The cultivation method according to claim 1, characterized in that, The physical characteristics of the black-footed chicken include: black feet and long legs.
4. The cultivation method according to claim 1, characterized in that, The physical characteristics of adult chickens in the first paternal line D include: mottled feathers, black legs, and short legs.
5. The cultivation method according to claim 1, characterized in that, The physical characteristics of the terminal paternal line E-strain adult chickens include: large size, mottled feathers, and black feet.
6. The cultivation method according to claim 1, characterized in that, The recessive White Rock chicken was bred from recessive White Rock chickens imported from the Israeli company KABIR, after the dominant white feather gene was removed through second-generation testcrosses.
7. The cultivation method according to claim 1, characterized in that, The physical characteristics of adult chickens in the maternal C line include: well-developed pectoral and leg muscles, thick shanks, and a tall and robust body.
8. The cultivation method according to claim 1, characterized in that, The adult hens of the parent generation are short-bodied, fast-feathered breeds with well-developed breast and leg muscles, and black beaks and shanks.
9. The cultivation method according to claim 1, characterized in that, The adult roosters of the parent generation are of the fast-feathering strain, with large bodies, thick shanks, and well-developed pectoral and leg muscles.
10. The application of the breeding method as described in any one of claims 1-9 in the breeding of dwarf and black-footed chickens.