822
Genetic Analysis of Energy Balance in the First Three Lactations of Japanese Holsteins

Tuesday, August 19, 2014
Posters (The Westin Bayshore)
Akiko Nishiura , NARO Institute of Livestock and Grassland Science, Tsukuba, Japan
Osamu Sasaki , NARO Institute of Livestock and Grassland Science, Tsukuba, Japan
Mitsuo Aihara , Livestock Improvement Association of Japan, Inc., Tokyo, Japan
Hisato Takeda , NARO Institute of Livestock and Grassland Science, Tsukuba, Japan
Masahiro Satoh , NARO Institute of Livestock and Grassland Science, Tsukuba, Japan
Abstract Text: The energy balance (EB) in the first three lactations of Japanese Holsteins were calculated, and the genetic parameters of EB were estimated using a multiple-trait random regression model. EB was negative soon after parturition and positive around days in milk (DIM) 60 in all parities. Heritability estimates of EB were within the range of 0.15–0.25 soon after parturition and highest in the 1st parity, particularly during the early stage of lactation. Genetic correlations of EB among parities were estimated to be within the range of 0.4–0.6 soon after parturition and the lowest between the 1st and 3rd parities. Genetic correlations between EB and milk yield were negative until DIM 75–105. Genetic correlation between EB and SCS in the 1st parity was -0.15 soon after parturition. The results of the genetic evaluation may help in improving EB of dairy cows.

Keywords:

dairy cow

energy balance

random regression test-day model

See more of: Posters: Dairy Cattle Breeding (Group 2)
See more of: Species Breeding: Dairy cattle
<< Previous Abstract | Next Abstract >>