젖소의 체형형질과 생산형질에 대한 유전모수의 추정 = Estimation of Genetic Parameters for Type and Production Traits in Dairy Cattle

다국어 초록 (Multilingual Abstract)

Three thousand two hundred twenty-one linear type records, 3,298 production records and 1,652 type-production records of Holsteins in Korea collected from 1984 to 1994 by the KAIA (Korea Animal Improvement Association) were analyzed to estimate genetic parameters as well as genetic and phenotypic correlations among type and production traits using multivariate REML. The heritabilities for milk and fat yield adjusted to 305 days were 0.31±0.07 and 0.26±0.06, respectively. The genetic correlation between milk and fat yields was 0.82 and the phenotypic correlation was 0.75. Linear type scores were low, especially for udder traits. The heritabilities for type traits ranged from 0.10 for udder support to 0.54 for stature. Rear udder height had the highest positive genetic correlation with rear udder width(0.72), whereas foot angle had the highest negative genetic correlation with rear legs side view(-0.36). Angularity, foot angle, rear udder width and teat placement had high genetic correlations with milk yield(0.31, 0.41 and -0.32, respectively). Rump angle, foot angle and rear udder width had high genetic correlations with fat yield(-0.37, -0.50 and 0.39, respectively).