Estimation of Genetic Parameters of Body Weights in Hanwoo Steers (Korean Cattle), Bos Taurus Coreanae Using Random Regression Model
2008
Seo, K.S. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea), E-mail: [email protected] | Salces, Agapita J. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea) | Yoon, D.H. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Lee, H.G. (Pusan National University, Busan, Republic of Korea) | Kim, S.H. (Kyung Hee University, Seoul, Republic of Korea) | Choi, T.J. (National Livestock Research Institute, RDA, Cheonan, Republic of Korea)
The study aimed to estimate genetic parameters of body weights in Hanwoo steers using random regression model and compare it with single trait animal model. A total of 1,372 Hanwoo steers that belonged to progeny testing program of the Hanwoo Genetic Improvement conducted at the Livestock Improvement Main Center of the National Agricultural Cooperative Federation (LIMC-NACF) in Rep. of Korea were used. Results of the random regression model fitting quadratic function revealed heritability values from 0.17 to 0.30 for the whole testing days up to 800 days. The results of the animal model showed estimated heritability values ranged from 0.24 to 0.36. Estimates of permanent environmental correlations tended to increase with increasing test in days. Unlike in the direct genetic correlation that at early stage the estimate was slightly negative it was 0.30 then increased to approach unity at later stage of test. Comparing the results between random regression model and the animal model showed not much differences and both followed similar pattern and therefore the use of random regression model for the national genetic evaluation of Hanwoo could be implemented.
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