Heterosis and additive breed effects on growth traits from crossing among Thai Local, Charolais and Amercian Brahman under Thai conditions
1993
Sornthep Tumwasorn | Kanchana Markvichitr | Preecha Innuraksa | Prattana Prucsasri | Charan Chantalakhana | Smith Yimmongkol | Panwadee Chitprasan (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Animal Science)
One thousand five hundred and thirty three records of growth traits were obtained from 16 different breeding groups at Kamphaeng Saen Livestock Research Station, Kasetsart University during the year 1975 to 1989. American Brahman and Charolais semen were used as sire breed to cross with Thai Local Native and the crossbred females. Least squares means from overall analysis showed that Charolais was suitable as the third sire breed out of American Brahman and Thai Local Native crossbred females. The direct maternal effect for all weights and gains from birth to 18 months old were found to be larger than additive breed and heterotic effects. The additive breed effect for Brahman was decreasing from -2.2 to -30 kg as compared to -2.2 to -56 kg for the additive breed effect of Charolais. The direct maternal effects of Charolais increased at the slower rate than that of Brahman from birth up to 18 months old (12 to 76 kg VS 7 to 91 kg). It was found that the heterotic effect obtained from crossing Charolais with Brahman was larger than those effects obtained from crossing Brahman and Charolais to the Thai Local Native females. These corresponding heterotic effects ranged between 3.7 to 6.1, 12.6 to 23.3, 19 to 58, and 41 to 73.6 kg for birth, weaning, yearling, and year and a half weights.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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