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Journal of Dairy Science Vol. 40 No. 3 240-251
© 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. II. Observations on Ration Digestibility and on the Excretion Pattern of Chromic Oxide1

S. Bloom2, N. L. Jacobson, R. S. Allen, L. D. McGilliard3 and P. G. Homeyer

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

ABSTRACT

The relationship between digestibility of feed and efficiency of milk production with Holsteins was investigated. Neither genetic ability nor feeding level significantly affected digestibility. It is believed that animals vary in their efficiency to utilize nutrients after absorption, but that differences in digestion and absorption are less important. Editor.

A number of investigators (6, 12, 30) have reported that efficiency of digestion does not vary greatly among cattle. However, Jarl (17) reported slight variation in the digestive powers of cows (3.5% difference between the most and least efficient cows) and Baker et al. (3) reported that beef steers which used the least feed per pound of gain seemed to be superior in their digestion of crude fiber.

This phase of the current study was designed primarily to determine digestibility values for the various rations described previously (4) and, thereby, to provide further information on the relationship between ration digestibility and efficiency of milk production.

FOOTNOTES

1 Journal Paper No. J-3016, Iowa Agricultural Experiment Station, Ames. Project No. 1195.

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

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






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Copyright © 1957 by the American Dairy Science Association ®.