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KMID : 1025520010430040423
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Journal of Animal Science and Technology
2001 Volume.43 No. 4 p.423 ~ p.430
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Estimation of Environmental Effects and Genetic Parameters for Somatic Cell Score and Production Traits of Dairy Cattle
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김시동/Kim, S. D.
박영일/최유림/한광진/이일주/정종현/김낙환/Park, Y. I./Choi, Y. L./Han, K. J./Lee, I. J./Jung, J. H./Kim, N. H.
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Abstract
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Effects of environmental factors and genetic parameters for somatic cell score(SCS) and production traits were estimated based on 4,722 records of Hostein cows at 113 test farms measured from January, 1994 to June, 1999. Calving year, calving season, cooperative and farm had significant effects on the five traits studied, SCS, milk, fat, protein and SNF(solid not fat) production, except for the farm effect on protein production. The SCS was significantly higher in the cows calving in summer than in other seasons. Milk production was highest in the cows calving in winter and lowest in summer. Heritabilities estimated by multiple trait animal model were 0.03, 0.28, 0.28, 0.30 and 0.29, respectively for SCS, milk, fat, protein and SNF production. Genetic correlations of SCS with milk, fat, protein and SNF production estimated were 0.18, 0.21, 0.25 and 0.22, respectively. Genetic correlations among fat, protein and SNF production were positive and high. Phenotypic correlations of SCS with milk, fat, protein and SNF production estimated were very low.
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KEYWORD
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