J. Anim Sci.
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J. Anim Sci. 1981. 52:1007-1013.
© 1981 American Society of Animal Science
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Additive Genetic and Heterosis Effects in Crosses among Cattle Breeds of British, European and Zebu Origin1

F. M. Peacock2, M. Koger3, T. A. Olson3 and J. R. Crockett4

University of Florida, Gainesville 32611

Abstract

Breed and heterosis effects for maternal and calf components for weaning traits were measured in the progeny of Angus (A), Brahman (B) and Charolais (C) sires mated to A, B, C and reciprocal AB, AC and BC dams. Additive breed effects for the calf component for weaning weight were –3.0 ± 3.2, –26.6 ± 3.1 and 29.6 ± 3.3 kg for A, B and C, respectively. Corresponding maternal breed effects were –1.7 ± 2.4, 7.8 ± 2.3 and –6.1 ± 2.6 kilograms. Heterosis effects on weaning weight for the calf component were 21.2 ± 3.6 for AB, 1.4 ± 3.7 for AC and 16.5 ± 3.4 for BC crosses, while heterosis levels for the maternal component were 28.9 ± 2.7 for AB, 16.5 ± 3.2 for AC and 18.7 ± 2.9 kg for BC dams. The corresponding estimates for condition scores tended to parallel those for weaning weight. Approximate relative production efficiency rates were computed for the different mating groups as (calf weight + cow weight) x weaning rate. These values were .34 for purebred matings, .36 for purebred dams raising F1 calves, .40 for F1 cows raising back-cross calves and .43 for F1 dams raising three-breed crossbred calves.

Footnotes

1 Florida Agr. Sta. Journal Ser. No. 2405. Contribution from the Southern Regional Beef Cattle Project, S-10.

2 Agricultural Research Center, Ona, FL 33865.

3 Anim. Sci. Dept., Univ. of Florida, Gainesville 32611.

4 Agricultural Research Education Center, Belle Glade, FL 33430.






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Copyright © 1981 by the American Society of Animal Science.