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Analysis of Environment Effects on the Growth and Carcass Traits in Hanwoo Steers  

Lee, Jae-Gu (National institute of Animal Science, RDA)
Choy, Yun-Ho (National institute of Animal Science, RDA)
Park, Byung-Ho (National institute of Animal Science, RDA)
Choi, Jae-Kwan (National institute of Animal Science, RDA)
Na, Jong-Sam (Dept. of Animal Biotechnology, Chonbuk National University)
Choi, Tae-Jeong (National institute of Animal Science, RDA)
Publication Information
Journal of agriculture & life science / v.45, no.6, 2011 , pp. 109-114 More about this Journal
Abstract
The objective of this study was to investigate the effects of environments (farms born, testing groups, age at the tests, date at slaughter, ages at slaughter) on body weights at 6, 12, 18 and 24 months of ages, body type measurements at 18 months of age and carcass characteristics in Hanwoo steer populations that were collected from commercial farms and reared in a progeny testing station. Performances of a total of 1,838 steer calves set for tests from 2004 to 2008 were recorded. Carcass characteristics were the carcass grading results evaluated and data collected slaughter scores at 24 months of age. For growth traits of all age classes and body type traits measured at 18 months of age, farms born, test group and linear covariate of age at test were fit in the models. For carcass traits, date at slaughter and linear covariate of ages at slaughter were fit in the models. Effect of farm at birth was not significant for body weight at 24 months of age. Carcass weight, eye muscle area, yield score and back fat thickness were affected by dates at slaughter but not by the ages at slaughter. Marbling score, however, was affected by these two effects. Farms at birth did not seem to affect body type measures greatly. This study will be utilized for Hanwoo Steers genetic evaluation.
Keywords
Body type; Carcass trait; Growth trait; Environmental effect; Hanwoo;
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