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Journal of Dairy Science Vol. 78 No. 12 2767-2781
© 1995 by American Dairy Science Association ®
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Responses of Early Lactation Cows Fed Winter and Summer Annual Forages and Undegradable Intake Protein

Jeffrey G. Wheeler 1, Henry E. Amos 1, Mark A. Froetschel 1, James C. Coomer 1, Tina Maddox 1, and J. Marcos Fernandez 2

1 Animal and Dairy Science Department, The University of Georgia, Athens 30602-2771
2 Department of Animal Science, Louisiana State University Agricultural Center, Baton Rouge 70803-4210

Twenty-four multiparous Holstein cows were divided into six blocks of 4 cows based on their previous 305-d mature equivalent milk yield and were used in a 2 x 3 factorial experiment for the first 84 DIM. Objectives were to determine the effects of forage and RUP supplementation on DM and nutrient intakes and digestibilities, milk yield and composition, BW change, and plasma concentrations of insulin, triiodothyronine, thyroxine, cortisol, NEFA, urea N, and protein. One cow from each block was assigned to wheat or sorghum silage plus one of three concentrates. Protein treatments were 1) all supplemental CP from soybean meal; 2) 33.3% of supplemental CP from heated soybean meal, fish meal, and corn gluten meal; and 3) protein treatment 2 plus an additional 4.6% CP from soybean meal. Intakes of DM, CP, NDF, ADF, NEL, and RUP were higher in cows fed sorghum silage; RUP tended to increase DMI, Milk and 3.5% FCM yields were higher for cows fed sorghum silage than for those fed wheat silage (42.3 vs. 40.0 kg/d and 41.2 vs. 38.7 kg/d, respectively). Milk protein, lactose, and SNF were increased by RUP. Insulin was increased, cortisol was decreased, and thyroid hormones were unaffected by RUP. Concentrations of NEFA were highest at wk 4. For early lactation cows fed diets containing sorghum or wheat silage, RUP is a necessity.

Key Words: ruminally undegrable protein • milk yield • plasma hormones

Submitted on September 23, 1994
Accepted on September 8, 1995




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I. R. Ipharraguerre and J. H. Clark
Impacts of the Source and Amount of Crude Protein on the Intestinal Supply of Nitrogen Fractions and Performance of Dairy Cows
J Dairy Sci, May 1, 2005; 88(e_suppl_1): E22 - E37.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the American Dairy Science Association ®.