Purebred breeding of cattle, also known as the breeding of this species. It refers to the method of continuously improving the herd quality and its production performance through selection, selection and breeding within the breed of cattle. Many beef breeds in foreign countries and many local breeds of yellow cattle are cultivated through this method; existing breeds of beef cattle still need to continue to implement the system of pure breeding to increase the efficiency of beef production.
Thoroughbred breeding is generally performed under the following conditions.
Local breeds of meat The variety has a relatively uniform appearance and high production performance, and has a stable heredity. In order to further improve its production performance, and promote its body shape appearance is more consistent, the method of pure breeding should be adopted to consolidate and improve the characteristics of some good traits. This method is also known as seed breeding. Such as China's excellent local breeds Qinchuan cattle, Nanyang cattle, Jinnan cattle, Luxi cattle, Yanbian cattle, Fuzhou cattle, Pixian Red Bull and Bohai Black cattle.
Beef breeder breeds This breed has been cultivated by people to make it a specialized beef breed with high meat production and stable heredity. In order to increase the number of groups, maintain the characteristics of varieties, and constantly improve the quality, it is necessary to plan the thoroughbred breeding. Such as foreign beef breeds such as Charolais, Limousin, Angus, Piedmont, Simmental, Hereford, and Shorthorn. All need to adopt the methods of pure breeding, maintain pure breeding, expand the population for the promotion and cross breeding needs.
Local breeds of meat have low economic value and cannot fully meet people's needs, but certain traits and characteristics, such as adaptability to the environment, disease resistance, resistance to roughage, and certain aspects of production performance, are certain or prominent. Advantages, which need to retain the necessary amount in a certain area, as a gene bank for cross breeding. This method is also called preservation seed breeding.
After the hybrids of meat hybrids enter the cross-fixation stage, they need to be targeted for selective breeding, fixing their good traits, and further improving the quality of the whole group and tending to tidy. Although the breeding work at this stage is not conducted within a variety, it can be similar to the method of breeding within a variety. This breeding method is also called self-breeding.
Mammal breeding group mating methods
It mainly includes two aspects: kin-breeding (inbreeding) and strain breeding.
The kinship breeding refers to the mating group of related male cows. Inbreeding is also called inbreeding. Parameters that reflect the degree of closeness are inbreeding coefficients and kinship coefficients. The inbreeding coefficient is a measure of the decrease in the proportion of heterozygous genes. Phylogenetic breeding can not only purify certain good genes, but also expose some recessive genes that are homozygous and reveal themselves as bad traits and become unhealthy individuals, resulting in smaller body size, weaker constitution, reduced production performance, and malformed development. The method of preventing inbreeding recession is as follows: First, inbreeding is performed only once or twice, then mating with a relative or relative in order to maintain its good traits; Second, strict selection is made to prevent mating of males with common defects; It is the poor individuals who have eliminated those mutant and recombined homozygous inferior genotypes.
Breeding is the advanced stage of breeding work. It is a breeding method commonly used in pure breeding. It is characterized by the purpose of cultivating differences in the type of herd in order to continue to maintain and expand the beneficial traits of the herd to future generations.
Thoroughbred breeding is generally performed under the following conditions.
Local breeds of meat The variety has a relatively uniform appearance and high production performance, and has a stable heredity. In order to further improve its production performance, and promote its body shape appearance is more consistent, the method of pure breeding should be adopted to consolidate and improve the characteristics of some good traits. This method is also known as seed breeding. Such as China's excellent local breeds Qinchuan cattle, Nanyang cattle, Jinnan cattle, Luxi cattle, Yanbian cattle, Fuzhou cattle, Pixian Red Bull and Bohai Black cattle.
Beef breeder breeds This breed has been cultivated by people to make it a specialized beef breed with high meat production and stable heredity. In order to increase the number of groups, maintain the characteristics of varieties, and constantly improve the quality, it is necessary to plan the thoroughbred breeding. Such as foreign beef breeds such as Charolais, Limousin, Angus, Piedmont, Simmental, Hereford, and Shorthorn. All need to adopt the methods of pure breeding, maintain pure breeding, expand the population for the promotion and cross breeding needs.
Local breeds of meat have low economic value and cannot fully meet people's needs, but certain traits and characteristics, such as adaptability to the environment, disease resistance, resistance to roughage, and certain aspects of production performance, are certain or prominent. Advantages, which need to retain the necessary amount in a certain area, as a gene bank for cross breeding. This method is also called preservation seed breeding.
After the hybrids of meat hybrids enter the cross-fixation stage, they need to be targeted for selective breeding, fixing their good traits, and further improving the quality of the whole group and tending to tidy. Although the breeding work at this stage is not conducted within a variety, it can be similar to the method of breeding within a variety. This breeding method is also called self-breeding.
Mammal breeding group mating methods
It mainly includes two aspects: kin-breeding (inbreeding) and strain breeding.
The kinship breeding refers to the mating group of related male cows. Inbreeding is also called inbreeding. Parameters that reflect the degree of closeness are inbreeding coefficients and kinship coefficients. The inbreeding coefficient is a measure of the decrease in the proportion of heterozygous genes. Phylogenetic breeding can not only purify certain good genes, but also expose some recessive genes that are homozygous and reveal themselves as bad traits and become unhealthy individuals, resulting in smaller body size, weaker constitution, reduced production performance, and malformed development. The method of preventing inbreeding recession is as follows: First, inbreeding is performed only once or twice, then mating with a relative or relative in order to maintain its good traits; Second, strict selection is made to prevent mating of males with common defects; It is the poor individuals who have eliminated those mutant and recombined homozygous inferior genotypes.
Breeding is the advanced stage of breeding work. It is a breeding method commonly used in pure breeding. It is characterized by the purpose of cultivating differences in the type of herd in order to continue to maintain and expand the beneficial traits of the herd to future generations.
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