Matching cattle

 Matching
cattle livestock technician China eighth child
matching means cattle herd, the cattle breeding goals according to plan most suitable for cows bulls, or choose the most suitable for the Bulls cows for mating to produce offspring of superior genotypes. Different matching, have different effects.
a quality matching the quality of matching is to consider mating
both quality and contrast matching. According to election both the similarities and differences with the quality, the quality of matching can be divided into homogeneous and heterogeneous optional optional.
1, homogeneous matching: is to choose the appearance, performance, or other economic traits similar to the excellent public cows mating. Its purpose is to obtain similar quality offspring with parents in order to consolidate and strengthen their good traits. homogenous main function is to stabilize the optional fine characteristics of cattle, increasing the number of homozygous genotypes, but also homogeneous combination may increase the frequency of harmful genes, to fix the shortcomings of both parents, resulting in decreased adaptability and viability. it is necessary to strengthen the selection, strictly out of poor individuals, to improve the feeding and management, to improve the homogeneity of the effect of matching .
2, heterogeneous matching: is to choose the appearance, performance, or other economic traits of different outstanding public and cow mating. Its purpose is to choose good characters with different mating male cows, with different advantages , access to both parents, good quality offspring. heterogeneous optional role is integrated by recombinant advantage of parents or offspring to improve the quality of some individuals to enrich the fine cattle in the selected character variation. In breeding practice, As long as there is some variation in cattle, the method can be used to improve the heterogeneous quality of matching, and in a timely manner to be fixed into the homogeneous matching.
Second, genetic matching is based on genetic matching
mating genetic relationships of both sides matching. by matching degree of relatedness of both near and far, is divided into inbreeding (referred to as inbreeding) and non-inbred (referred to as non-inbred). is generally believed that less than 5 on behalf of the public might be related cow is called inbreeding mating, otherwise known as non-inbred. From the perspective of genetic analysis of a large group under certain conditions, groups of gene frequencies and genotype frequencies from generation to generation should be able to maintain a relative balance If the bottom two generations of the same environmental conditions, performance in the number of mean and standard deviation are substantially the same. However, if it is not random mating, and replace them with matching, would break the balance. elected among individuals with genetic the genetic relationship between higher degree of random mating is inbreeding when, less than the extent of random mating is the hybrid.
three matching points should be noted
1, each cattle farm to be worked out on a regular basis cattle breeding objectives consistent with the matching program, paying particular attention to and prevent inbreeding depression.
2, on the basis of the survey analysis, for each cow its own characteristics and choose the good with the Bulls, that is, said that, with the Bulls must be descendants of tests, and milk production, milk fat, appearance, or select the index of breeding value than cows.
3, after the effect of each option should be promptly analyzed and summarized, and continuously improve the selection with the effect of the work.