This work was conducted at the “Departamento de Zootecnia, Universidade Federal de Santa Maria”, Brazil, ninety-six, Charolais (C), Nellore (N), Vi CN and Vi NC cows were used. Milk production at 14 (M14), 42 (M42), 70 (M70) e 90 (M90) days post-partum were evaluated. Milk production of C and N cows was similar (P>0.0500) being 5.39, 4.60, 3.26 and 3.84 kg/day for C cows at M14, M42, M70 and M90, respectively, and 4.51, 3.73, 3.37 and 3.95 kg/day for N cows. Crossbred cows also showed similar (P>0.0500) milk production being 6.86, 6.87, 5.44 and 4.87 kg/day for V 2 CN cows and 6.86, 5.99, 4.72 and 5.04 kg/day for V 2 NC cows. Heterosis for M14, M42, M70 and M90 was, respectively, 38.59 (P<0.0126), 43.99 (P<0.0073), 42.17 (P<0.0058) and 29.23% (P<0.0479). Crossbred cows produced more milk and weaned heavier calves at 90 days than straightbred cows. Keywords: beef cows, Charolais, heterosis, milk produciton, Nellore.

J. Restle, D. B Senna, F. N Vaz, R. Z Vaz

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 263–266, 1998
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