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Relation of Estimation Method, Sampling Interval and Milk Composition to Milk Yield of Beef Cows and Calf Gain^{1, 2,}

Oklahoma State University,⁵ Stillwater 74074

Abstract

TWENTY-FOUR beef cows were maintained in drylot through three lactations to provide 36 complete 210-day lactations terminating with a weaned calf. Calves were separated from their dams at 10 days, allowed to nurse twice daily, and provided a maintenance allowance of supplemental ration from 112 to 210 days. Milk yield was estimated by weighing the calf before and after nursing (calf-weight-change) twice daily 6 days each week, and by milking one udder half while the calf nursed (hand-milking) twice 1 day per week. Sex-corrected calf weight at 210 days and daily gain to 70, 112 and 210 days were calculated. Milk was analyzed for fat and total solids.

Calf-weight-change estimates of milk yield were higher and less variable than hand-milking estimates at every stage of lactation; average daily milk yield estimated by calf-weight-change was 29% higher than the yield estimated by hand-milking, 5.85 vs. 4.54 kg, respectively, for 210 days.

¹ Journal Paper 1981 of the Oklahoma Agricultural Experiment Station, Stillwater.

² The assistance of J. B. Mickle, Department of Animal Sciences and Industry, in determination of milk constituents and R. D. Morrison, Department of Mathematics and Statistics, in statistical analysis and computer programming is gratefully acknowledged.

³ Present address: Garden City, Kansas.

⁴ Present address: Texas A & M University, San Angelo.

⁵ Department of Animal Sciences and Industry.

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