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Journal of Dairy Science Vol. 50 No. 12 1966-1972
© 1967 by American Dairy Science Association ®
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Feed Processing. II. Effect of Feeding Expanded Grain and Finely Ground Hay on Milk Composition, Yield, and Rumen Metabolism1

V. F. Colenbrander2, E. E. Bartley, J. L. Morrill, C. W. Deyoe and H. B. Pfost

Departments of Dairy and Poultry Science, and Grain Science and Industry, Kansas State University, Manhattan

ABSTRACT

Six Holstein cows receiving an experimental ration of expanded sorghum grain (95–100% gelatinized) and alfalfa hay (finely ground) were compared in a 12-week trial with six Holstein cows fed a control ration of cracked sorghum grain and chopped hay (coarse). Enough grain and hay were fed at a 1:1 ratio to provide estimated net energy requirements. The experimental animals averaged 2.1 kg more milk (P < .01) and somewhat more protein and lactose (P < .10), but 1.8 kg less fat-corrected milk (P < .01) per day than the controls. Percentages of protein, lactose, ash, and solids-not-fat were similar for both groups. Due to reduction in milk fat percentage for the experimental group (2.2% compared with 3.8% for the controls), total solids were 10.9% compared with 12.6% for the controls. After the experimental group was fed the control ration ten days, their milk fat percentage was similar to that of the controls. Peed protein was more efficiently converted into milk protein in the experimental group. Molar percentages of volatile fatty acids for the control and experimental groups, respectively, were: acetic, 68.1, 53.7; propionic, 17.4, 31.7; butyric, 12.3, 10.6; isovaleric, 1.2, 0.4; valeric, 1.1, 3.6. Rumen ammonia-nitrogen concentration was lowered considerably in the experimental animals. Rations fed had no effect on blood glucose level. Body weight gains were significantly higher on the experimental ration.

FOOTNOTES

1 Contributions no. 668 and 606 Kansas Agricultural Experiment Station, Manhattan. Data in this paper are in part from a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree in Animal Nutrition at Kansas State University.

2 Present address: Department of Animal Sciences, Purdue University, Lafayette, Indiana.






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Copyright © 1967 by the American Dairy Science Association ®.