Abstract: This study utilized 9,881 records of linear type scores consisting of 15 primary traits and 12,304 production records of Holsteins from 1984 to 1995 in Korea to estimate genetic parameters for production and type traits using animal models. The results obtained were as follows:1. The heritabilities for type traits prior to 1990 was higher than those after 1990. The heritabilities for body type and udder traits ranged from 0.101 to 0.209 and from 0.082 to 0.281 respectively. 2. The means of rear udder height and rear udder width were 21.56 and 20.25cm. These results suggested that ganetic improvement of these traits should be needed. The skewedness for type traits was not proper, more accurate measurement for type trait is required. 3. General appearances which had the highest genetic correlation with udder traits were dairy foam, sump angle, and rump width. The udder depth had the highest ganetic correlation with fore udder attachment and body depth. 4. All of the type traits except for rump angle and udder cleft had positive genetic correlations with final score, and rear udder width had the highest ganetic correlation with final score. 5. The heritabilities for milk and milkfat were 0.278 and 0.194, and the repeatabilities for these traits were 0.467 and 0.434. 6. The order of type traits which had the highest genetic correlation with production traits was rear udder height, rear udder width, dairy form and final score.
Publication Year: 1996
Publication Date: 1996-01-01
Language: en
Type: article
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