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Journal of Dairy Science Vol. 43 No. 9 1275-1281
© 1960 by American Dairy Science Association ®
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Forage Intake and Efficiency of Feed Utilization in Dairy Cattle1

J. B. Stone2, G. W. Trimberger, C. E. Henderson, J. T. Reid, K. L. Turk and J. K. Loosli

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

The data from 12 forage experiments, involving 175 Holstein-Friesian cows, were analyzed to study the variation among cows in their forage appetite and the efficiency of feed utilization. Highly significant differences were found among cows in their forage dry matter intake, even after adjustment had been made for milk production, body weight, and daily changes in weight. On a within forage treatment period and year basis the repeatability of the weekly average of forage dry matter consumption was 0.70. Cows tended to maintain their rank in forage consumption when fed several different kinds of forage. The difference among cows in their efficiency of feed utilization was also highly significant. The average efficiency for 20 wk., starting 60 days after calving, was a requirement of 56.7 lb. of TDN for each 100 lb. of FCM produced. Consistent and highly significant differences in efficiency were found in favor of grass silage as compared with hay as a source of forage. Some possible explanations of this are discussed.

FOOTNOTES

1 Results presented in this paper are from a thesis submitted by the senior author to the faculty of the Graduate School of Cornell University in partial fulfillment of the requirements for the Ph.D. degree, September, 1959.

2 Present address: Department of Animal Husbandry, Ontario Agricultural College, Guelph, Canada.






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Copyright © 1960 by the American Dairy Science Association ®.