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Journal of Dairy Science Vol. 58 No. 6 917-921
© 1975 by American Dairy Science Association ®
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Stage of Lactation as a Criterion for Switching Cows from One Complete Feed to Another during Early Lactation1

I. O. Akinyele and S. L. Spahr

Department of Dairy Science, University of Illinois, Urbana 61801

ABSTRACT

Holstein (91) and Brown Swiss (29) cows were group-fed high (1.98) or medium (1.78 Mcal of net energy Lactation /kg of dry matter) energy complete feeds ad libitum during the first 24 wk of lactation. Feeds consisted of corn silage, alfalfa haylage, ground shelled corn, and soybean oil meal mixed in least-cost combinations to provide 16% crude protein. Weeks on high, and weeks on medium energy diets were (1) 1 to 24, and 0; (2) 1 to 16, and 17 to 24; (3) 1 to 8, and 9 to 24; (4) 1 to 8, and 9 to 24; (5) 1 to 16, and 17 to 24; (6) 0 and 1 to 24. Means for groups 1 to 6 were daily milk – 22.1, 22.6, 23.1, 22.0, 21.4, and 21.6 kg/cow; daily 4% fat-corrected-milk – 21.8, 21.9, 22.4, 21.0, 21.2, and 21.4 kg/cow; changes in body weight +25.5, –1.2, –11.1, +24.2, +20.7, and +3.5 kg/cow. Cows consuming high energy diet produced more milk during the first 8 wk. There were no significant differences in daily production of milk or 4% fat-corrected-milk. Cows switched from medium to high after 8 wk ranked first for persistency of daily milk during wk 17 to 24 of lactation. Cows receiving high energy diets initially lost less weight in wk 4 to 8, and those receiving high energy diets after 8 wk gained more weight, especially during weeks 16 to 24, than cows receiving medium feed.

FOOTNOTES

1 Supported by the Illinois Agricultural Experiment Station.






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Copyright © 1975 by the American Dairy Science Association ®.