The Effect of the Incomplete Lactation Records for Genetic Evaluations with Random Regression Test-Day Models (RRTDM) in Holstein Cattle
2005
Cho, J.H. (Dairy Cattle Improvement Center, N.A.C.F, Seosan,) | Cho, K.H. (National Livestock Research Institute, RDA, Suwon, Republic of Korea) | Lee, K.J. (Konkuk University, Seoul, Republic of Korea), E-mail: kjlee@kkucc.konkuk.ac.kr
The purpose of this study was to find out the effects that daughters' incomplete lactation records affect sire's breeding values through genetic evaluation using RRTDM(random regression test-day model). First, we estimated genetic parameters and breeding values on sires having complete lactation records of daughter by RRTDM, second, we changed complete lactation records of specific sires into incomplete records by various methods. Third, the breeding values were compared between complete and incomplete records. Finally, this study aimed to find out the methods to minimize the estimation errors of young bulls' breeding values.
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