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http://dx.doi.org/10.5713/ajas.2002.1680

Heritability and Repeatability Estimates for Reproductive Traits of Japanese Black Cows  

Oyama, K. (Experimental Farm, Kobe University)
Katsuta, T. (Faculty of Agriculture, Kobe University)
Anada, K. (Wagyu Registry Association)
Mukai, F. (Faculty of Agriculture, Kobe University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.15, no.12, 2002 , pp. 1680-1685 More about this Journal
Abstract
Reproductive data collected from more than 20,000 Japanese Black cows of Hyogo and Shimane Prefectures were analyzed. Averages of age at first calving, gestation length, days open and calving interval were 25.1 mo, 289 d, 112 d and 401 d, respectively. Variance components were obtained by REML procedure and the heritability estimate of age at first calving was 0.22. In gestation length the heritability estimate was 0.40 and no permanent environmental effect was estimated. Estimated variance components of calving interval were similar to those of days open and the heritability and repeatability of calving interval were 0.05 and 0.09, respectively. Random farm effects accounted for approximately 10% of phenotypic variations in all traits. Genetic and farm correlations between age at first calving and calving interval were 0.27 and 0.39, respectively. It was found that temporary environment was an important source of variation for calving intervals of Japanese Black.
Keywords
Reproductive Trait; Japanese Black Cattle; REML; Heritability; Repeatability;
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