Aziz Mahmoud, A., Malau-Aduli, Enoch, Takatoshi, Kojima, Kanzunaga, Oshima, and Masanori, Komatsu (2002) Estimation of genetic and phenotypic parameters and environmental trends of pre-weaning growth traits of Japanese Black calves using animal model. The Journal of Animal Genetics, 30 (1). p. 59.

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Abstract

Data collected on 1739 records of Japanese Black calves during the period from 1937 to 2002 were analysed. The herd belongs to the Department of Livestock and Grassland Science, National Agricultural Research Center for Western Region, Oda City, Shimane Prefecture. The objectives were to estimate heritability, maternal effect and genetic and phenotypic correlations between birth weight, weaning weight and average daily gain from birth to weaning, to estimate calf breeding values and to evaluate genetic and phenotypic trends for these traits. Heritability estimates of birth weight, weaning and average daily gain were 0.39, 0.17 and 0. 26, respectively. The corresponding maternal components were 0.10, 0.10 and 0.11, respectively. Genetic correlations between birth weight and weaning, birth weight and average daily gain and weaning weight and average daily gain were 0.30, -0.17 and 0.86 , respectively. The corresponding phenotypic correlations were 0.19, -0.33 and 0.90, respectively. Calf breeding values ranged between -17.93 and 2.83, between -4.72 and 18.08 and between -0.070 and 0.182 kg for birth weight, weaning weight and average daily gain, respectively. Regression coefficients of breeding values of birth weight, weaning weight and average daily gain on year of calving were not significant and accounted for 0.011±0.012, -0.02±0.02 and -0.0002±0.0002, respectively. The corresponding regression coefficients of the phenotypic values of weaning weight and average daily gain of year of calving were significant and accounted for 2.16±0.31 and 0.013±0.002, respectively, however, that of birth weight was not significant (0.18±0.10). Breeding values fluctuated across years of study with no certain trend. Similar trend was observed for phenotypic values. It is concluded that environment may have higher influence on calf performance than genetics. Selection has never been practiced in this herd.

Item ID:	55009
Item Type:	Article (Abstract)
ISSN:	1344-9265
Related URLs:	Organisation
Date Deposited:	14 Aug 2018 03:51
FoR Codes:	07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070201 Animal Breeding @ 100%
SEO Codes:	83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830301 Beef Cattle @ 100%
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