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Journal of Dairy Science Vol. 53 No. 4 427-429
© 1970 by American Dairy Science Association ®
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Influence of Repeated Oxytocin Injections on Composition of Dairy Cows' Milk1

G. T. Lane, C. W. Dill, B. C. Armstrong and L. A. Switzer

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

Milk fat, solids-not-fat, protein, and lactose were determined in milk from normal milking, followed by four successive intravenous oxytocic injections at 20-minute intervals. Milk fat per cent increased through the first oxytocic sample, then decreased to approximately the fat content of milk obtained by normal milking procedures. Solids-not-fat, protein, and lactose were all significantly (P < 0.01) lower in milk removed after the injection of oxytocin than in the samples taken during normal milking. Milk yield approached a constant level with repeated injections of oxytocin, indicating a constant rate of secretion. Rate of secretion approached the rate needed to synthesize the milk produced daily by these cows.

FOOTNOTES

1 Technical paper no. TA8016 of the Texas Agricultural Experiment Station, College Station.






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Copyright © 1970 by the American Dairy Science Association ®.