BREEDING METHOD FOR SIMPLIFYING SELECTION OF HIGH-YIELD A2A2 HOMOZYGOUS GENOTYPE DAIRY COWS BASED ON PEDIGREE DATA

摘要

The present invention discloses a breeding method for simplifying selection of high-yield A2A2 homozygous genotype dairy cows based on pedigree data. Through carrying out the dairy herd improvement (DHI), the pedigree data and phenotype data of individual cows are collected, and the genetic evaluation is conducted combined with the results of paternal P casein genotype to obtain the breeding values of milk yield, milk fat yield, milk protein yield and milk protein rate. Finally, the high production indexes (HPIs) of individuals are calculated to obtain the high-yield A2A2 homozygous individuals. The present invention performs the herb screening by applying the daily DHI data, which greatly reduces the workload during the actual production process of the dairy farm; The present invention can screen the homozygous A2A2 individuals from the herd quickly, simply and accurately.