J. Anim Sci.
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J. Anim Sci. 1988. 66:1144-1152.
© 1988 American Society of Animal Science
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Maternal Characteristics of Young Dams Representing Bos Taurus and Bos Indicus x Bos Taurus Breed Types1

C. M. Bailey2, D. R. Hanks3, W. D. Foote2 and Y. O. Koh4

University of Nevada- Reno, 89557

Abstract

Reproductive traits and preweaning growth of progeny from young Hereford, Red Poll, Hereford x Red Poll, Red Poll x Hereford, Angus x Hereford, Angus x Charolais, Brahman x Hereford and Brahman x Angus dams were evaluated. First-calf heifers were mated with Red Angus bulls; Santa Gertrudis sires were used for each cow's second and third breeding season. Herefords, Red Polls and Hereford-Red Poll crosses were below average in percentage of calves weaned, whereas Angus-sired and Brahman-sired dams exceeded the overall mean. Angus x Charolais (P < .10), Brahman x Hereford (P < .01) and Brahman x Angus (P < .10) dams weaned a higher percentage of calves than straightbred Herefords. None of these breed types differed from young Angus x Hereford females in reproductive performance. Angus x Charolais calves ranked highest in 180-d calf weight, exceeding progeny from both Hereford (P < .01) and Angus x Hereford (P < .10) dams. Brahman x Hereford dams weaned heavier (P < .05) calves than Herefords, but their progeny did not differ at weaning from those reared by Angus x Herefords. Calves from Brahman x Angus dams weighed 12.7 kg less (P < .01) than Angus x Hereford progeny. Analysis of the Hereford-Red Poll diallel showed evidence of (P < .10) maternal heterosis in 180-d calf weight. Means for kilograms of calf weaned per female exposed for breeding were 147, 170, 153, 168, 182, 180, 185 and 168 for Hereford, Red Poll, Hereford x Red Poll, Red Poll x Hereford, Angus x Hereford, Angus x Charolais, Brahman x Hereford and Brahman x Angus dams, respectively, with dam weight held constant.

Footnotes

1 Don Albert, Supervisor, Main Station Field Lab. and Art Cerfoglio, former Supervisor, made important contributions to this project.

2 Anim. Sci. Dept.

3 School of Vet. Med.

4 Statistical Consultant, Grad. School.






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Copyright © 1988 by the American Society of Animal Science.