J. Anim Sci.
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J. Anim Sci. 1969. 29:606-611.
© 1969 American Society of Animal Science
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Estimation of Yield and Composition of Milk Produced by Grazing Beef Cows1

D. R. Lamond2, J. H. G. Holmes3 and K. P. Haydock4

C.S.I.R.O. Pasture Research Station, Brisbane, Australia

Abstract

Experiments were carried out to develop a reliable and practicable method for estimating rate of milk secretion of beef cattle in the field. After preliminary studies a 6-hr, test was adopted; 20 I. U. of oxytocin were given intravenously at the beginning and end of the test period and milk was obtained: by teat cannulation. The method was evaluated under field conditions. Milk yield, fat percentage and energy production were estimated over a lactation period for a herd of 62 Hereford cows.

It was concluded that the method could have a wide application in studies of beef cattle husbandry and also would be a useful technique in studies of productivity of animals on pasture.

Footnotes

1 This research was conducted at the C.S.I.R.O. Pasture Research Station, Brisbane, Australia. We are indebted to Dr. J. Griffiths Davies for making available Hereford cows from the station herd. Our colleagues, Mr. B. Bindon and Mr. A. Takken provided valuable assistance. The work was supported by the Australian Meat Research Committee.

2 C.S.I.R.O. Division of Animal Physiology, Cunningham Laboratory, Mill Road, St. Lucia, Queensland. Present address: Dept. Animal Science, Clemson University, Clemson, S. C.

3 Department of Animal Science, University of California, Davis.

4 C.S.I.R.O. Division of Mathematical Statistics, Cunningham Laboratory, Mill Road, St. Lucia, Queensland.






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Copyright © 1969 by the American Society of Animal Science.