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Journal of Dairy Science Vol. 76 No. 2 499-513
© 1993 by American Dairy Science Association ®
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Effects of Source and Level of Undegraded Intake Protein on Nutrient Use and Performance of Early Lactation Cows

C. M. Keery 1 and H. E. Amos 1

1 Department of Animal and Dairy Science, University of Georgia, Athens 30602

At parturition, groups of six cows (two primiparous) were assigned randomly to experimental diets composed of wheat silage, concentrate containing 11.4% yellow grease, corn, and supplemental protein sources. Protein sources were soybean meal, heated soybean meal, and a combination of corn gluten and heated soybean meals. Intakes of DM, NDF, and NEL were not affected by undegraded protein levels (trial 1). Milk and 4% FCM yields and percen- tages of CP, lactose, SNF, and total solids were not influenced by protein source. Mobilization of body tissue was accelerated by heated soybean meal. During wk 1 to 4 postpartum, efficiency of NEL utilization was greater for cows receiving the combination treatment than for those receiving the soybean meal treatment. During wk 4 to 8, cows fed the heated soybean treatment utilized NEL more efficiently for milk yield than cows fed the combination treatment. Efficiency of utilization of absorbed protein was not affected by level of undegraded protein. At wk 9, fat was removed from the concentrate, and a second trial was conducted. Intakes of DM and NEL were reduced for cows fed the combination treatment. Milk yield and composition and efficiency of utilization of NEL and absorbed protein were not affected by level of undegraded protein.

Key Words: undegraded protein • rumen • net energy • efficiency • absorbed protein

Submitted on July 2, 1992
Accepted on September 21, 1992




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Copyright © 1993 by the American Dairy Science Association ®.