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Journal of Dairy Science Vol. 48 No. 11 1467-1472
© 1965 by American Dairy Science Association ®
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Effect of the Net Energy Concentration of Total Ration on Milk Production and Composition1

D. Zeremski2, H. H. Van Horn, A. D. McGilliard and N. L. Jacobson

Department of Animal Science, Iowa State University, Ames

ABSTRACT

Eighteen Holstein cows were assigned, after a 17-day preliminary period, to three rations, using a double 3 x 3 Latin-square design. The pounds of alfalfa-orchard grass hay and corn silage offered each cow during the experimental periods were, respectively: Ration A—6, 24; Eation B—10, 40; Ration C—14, 56. Concentrate was added to each ration so that total feed energy offered supplied maintenance needs plus 0.39 therm estimated net energy per pound 4% FCM. Each experimental period was 4 wk, the last 3 wk being used to evaluate ration effects. Average daily intakes of hay, silage, and concentrate, respectively, for the rations were: A—5.6, 23.3, 26.6 lb; B—8.5, 36.4, 20.5 lb; C—10.9, 45.9, 14.6 lb. Average 4% FCM was 46.7, 46.2, and 43.8 lb daily for Rations A, B, and C, respectively. Milk production on Rations A and B was significantly higher (P < .01) than on C, but gross and net efficiencies were essentially the same for all rations. There was a significant increase (P < .05) in SNF with increasing proportions of concentrate in the ration. There was no depression of fat level in milk on any of the rations. Cows on Ration C gained the most weight, but weight changes on all rations were small, suggesting that the level of feeding employed herein approximated the needs of the animals.

FOOTNOTES

1 Journal Paper no. J. 5021 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 1541.

2 Present address: Faculty of Agriculture, University of Belgrade, Belgrade, Yugoslavia.






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