Data from 377 Angus (a), Criollo (c) and reciprocal cross calves born from 1981 to 1984 were analyzed on birth weigth (BW), average absolute daily gain 
(ADG) relative daily gain (RGR) and weaning weight (tt/W) to estimate hete
rosis and differences in breed transmitted and maternal effects.Genetic components 
were estimated using orthogonal contrasts on least-squares means. There was no he 
terosis for BW, C transmitted effects were ll°/> over A (P/_.05), and A maternal e- 
ffects 7°/> over C fP/ .05).Breeds and crosses were very similar for RGR showing no 
heterosis or difference in any of the components analyzed.For ADG and WW genetic 
components followed the same trend in male and female calves but their statisti
cal significance differed: heterosis was significant (P/ .05)only for females
(ADG: 9%, WW:8°/>); for male calves, the C transmitted effects were 18°/o over A (P/_ 
.05)and A maternal effects were 11% over C (P/ .05).

M. C Miquel

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 342–346, 1986
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