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Heritability and Repeatability Estimates for Reproductive Traits of Japanese Black Cows
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Heritability and Repeatability Estimates for Reproductive Traits of Japanese Black Cows
Oyama, K.; Katsuta, T.; Anada, K.; Mukai, F.;
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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.
Reproductive Trait;Japanese Black Cattle;REML;Heritability;Repeatability;
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