J. Anim Sci.
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J. Anim Sci. 1970. 31:956-960.
© 1970 American Society of Animal Science
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Influence of Melengestrol Acetate and Energy Intake upon Weight and Milk Yield and Composition of Angus-Holstein Cows and Progeny Growth Rate1

L. L. Wilson, M. C. Rugh, J. M. Stout, M. J. Simpson, T. A. Long and H. R. Purdy2

The Pennsylvania State University, University Park

Abstract

Twenty-four Angus-Holstein F1 cows and their calves (half-sib Angus-sired) were allotted to a trial of moderate (33,600 kcal calculated DE/head/day) vs. high (38,640 kcal) and control vs. MGA-treated. The two energy levels were isonitrogenous and the animals were group-fed. Each of the four groups contained three steer and three heifer calves. Initial calf age averaged 19.3 days and ranged from 12 to 29 days. Twenty-eight days after initiation of the trial, the two MGA-treated lots received 1.0 mg/day for 14 days. After a subsequent 56 days of A.I. breeding (period 1, 98 days) for all lots, MGA-feeding was resumed and continued to termination of the 182-day trial. Each of the four groups contained two non-pregnant cows (based on a rectal palpation on the 143rd day of the trial). Milk consumption and yield were estimated from pre-vs. post-suckling calf weights and milking machines, respectively. At the begin-nining of each 12-hr, separation period, 40 U.S.P. units of oxytocic principle were injected into the coccygeal vein and the cows were handstripped. Average weight changes of cows receiving the moderate and high energy levels were –23.1 and 4.9 kg, respectively ( – 126.9 and 26.9 g/day, P<.05). Means for calf daily gain of the respective energy levels were 875 and 948 g/day (NS). Means of the moderate and high energy level groups were 4.21 and 5.27 kg for 12-hr, milk yield (P<.01) and 3.45 and 3.93 kg for 12-hr, consumption (P<.05). Milk yield and consumption were correlated 0.67 (P<.01). Calf gain was correlated 0.54 (P<.05), 0.63 and 0.59 (P<.01) with 12-hr, yield, consumption and SCM, respectively. Percent BF, protein and SNF were not significantly correlated with calf gain or milk consumption. Neither MGA-treatment nor the three, two-way interactions significantly affected cow or calf weight changes or the milk traits. Calf sex significantly (P<.05 or P<.01) affected only calf gain.

Footnotes

1 Department of Animal Science, published with the approval of the Director, The Pennsylvania Agricultural Experiment Station, No. 3702 of the Journal Series.

2 Appreciation is extended to the pennsylvania Department of Justice, A. T. Prassee, Commissioner, and the State Correctinal Intitution at Rockview, A. C. Cavell, Superintendent, lor granting permission for use or cattle; to tne Tuco Products Co., The Upjohn Co. and the Leon Falk Family Trust for grants-in-aid; and to W. H. Cloninger and A. E. Branding. Dept. of Dairy Sci., for technical consultation.

3 6-dehydro-16-methylene-6-methy 1-17a-acetoxyprogesterone (MGA), product of The Upjohn Co., Kalamazoo, Mich.






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Copyright © 1970 by the American Society of Animal Science.