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Journal of Dairy Science Vol. 40 No. 1 81-94
© 1957 by American Dairy Science Association ®
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Effects of Various Hay-Concentrate Ratios on Nutrient Utilization and Production Responses of Dairy Cows. I. Relationships among Feeding Level, Predicted Producing Ability, and Milk Production1

S. Bloom2, N. L. Jacobson, L. D. McGilliard3, P. G. Homeyer and E. O. Heady

Departments of Animal Husbandry, Statistics and Economics Iowa Agricultural Experiment Station, Ames

ABSTRACT

Thirty-six Holsteins were divided into high, medium, and low producing groups in order to evaluate their efficiency for milk production. It was found, regardless of the ratio of concentrates to hay fed, that the inherent ability of cows to produce milk was more significant than the intensity of feeding. Editor.

There are many reports in the literature related to the nutrition, physiological response, and milk production of dairy cows fed various levels and combinations of roughages and concentrates. Mead and Goss (9) have studied ruminant digestion without roughage, whereas Sherwood and Dean (14) have employed alfalfa as the sole feed of dairy cattle over successive lactations. Huffman (4) has reviewed the effects of roughage quality and quantity in the dairy ration. The study reported by Martin et al. (8), was designed to determine whether varying the rate of hay feeding within normal limits while maintaining a constant TDN intake affected the level of production or the well-being of dairy cows.

FOOTNOTES

1 Journal Paper No. J-2931, Iowa Agricultural Experiment Station, Ames, Project No. 1195.

2 Present address: Department of Animal Husbandry, Agricultural Research Station, Rehovot, Israel.

3 Present Address: Dairy Department, Michigan State University, East Lansing.






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Copyright © 1957 by the American Dairy Science Association ®.