J. Anim Sci.
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J. Anim Sci. 1989. 67:617-623.
© 1989 American Society of Animal Science
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Effects of Creep Feeding, Zeranol Implants and Breed Type on Beef Production: II. Reproductive Development and Fat Deposition in Heifers1

D. L. Prichard2, T. T. Marshall3, D. D. Hargrove3 and T. A. Olson3

University of Florida, Gainesville 32611

Abstract

Effects of preweaning creep feeding and zeranol implants on reproductive tract development and udder and s.c. fat deposition were studied in 24 weanling heifers (7 mo of age) with Brahman and Romana Red sires and Angus and Angus x Brown Swiss F1 reciprocal crossbred dams. Creep treatment did not affect (P > .19) ovarian weight, ovarian size, uterine horn diameter or follicle number. Heifers from the three creep treatments did not differ (P > .25) in udder weight, total lipid or percentage of lipid in the udder. Noncreep-fed (NC) heifers had a greater (P < .02) number of adipocytes/gram of udder tissue than did the long-term creep-fed (LC) and short-term creep-fed (SC) heifers. The LC heifers had larger udder (166.0 vs 152.7 m) and s.c. adipocytes (166.7 vs 148.8 m) than NC heifers. Heifers implanted with zeranol at 56 and 146 d of age had a greater (P < .03) uterine horn diameter and heavier (P < .02) uterine weight than unimplanted heifers. Percentage of lipid in the udder was lower (P < .02) in heifers implanted with zeranol. Implanted heifers had smaller (P < .10) s.c. adipocytes than unimplanted heifers. Breed of dam did not effect (P > .17) development of the reproductive tract of weanling heifers. Heifers from Angus dams had smaller (P < .08) udders and less (P < .10) total fat in the udder than those from F1 dams, and the heifers from F1 dams tended (P < .12) to have larger udder adipocytes. Brahman-sired heifers had a greater ovarian weight (P < .04) and size (P < .02) than Romana Red-sired heifers. Brahman-sired heifers had more (P < .004) total udder adipocytes, whereas Romana Red-sired heifers tended (P < .14) to have larger udder adipocytes.

Footnotes

1 Florida Agric. Exp. Sta. Journal Ser. No. 8610. Sponsored in part by a grant from Pittman-Moore, Terre Haute, IN.

2 North Florida Res. and Educ. Center, Quincy 32351.

3 Dept. of Anim. Sci.






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Copyright © 1989 by the American Society of Animal Science.