JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 74 No. 1 211-219
© 1991 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Cant, J. P.
Right arrow Articles by Baldwin, R. L.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Cant, J. P.
Right arrow Articles by Baldwin, R. L.

Effect of Dietary Fat and Postruminal Casein Administration on Milk Composition of Lactating Dairy Cows

J. P. Cant 1, E. J. DePeters 1, and R. L. Baldwin 1

1 Department of Animal Science, University of California, Davis 95616

Perturbation of the amino acid status of lactating dairy cows was undertaken to characterize the mechanism of dietary fat-induced milk protein depression. Four first lactation heifers fitted with rumen cannulas were assigned to a factorial arrangement of treatments: two diets and two casein infusion sites within a 4 x 4 Latin square design. Diets were formulated with yellow grease at 0 or 4% of DM. An 8% sodium caseinate solution was infused continuously at 5.04 kg/d (SE = .05) into the rumen or abomasum during the last 5 d of each 21-d period. Dry matter, N, energy, and NDF digestibilities were reduced by dietary fat treatment, but intakes of digestible DM, N, and energy were not affected. Yellow grease supplementation improved milk yield 14% and milk fat content 7%, whereas lactose, CP, and casein N percentages in milk were reduced. Abomasal sodium caseinate infusions had no effect on milk yield or composition other than to increase protein and casein N concentrations. Dietary fat-induced milk protein depression remained evident during abomasal casein treatments, indicating a mechanism independent of amino acid status of the cow. Improved intestinal availability of amino acids partially reversed detrimental effects of dietary fat on milk protein fractions.

Key Words: dietary fat • postruminal casein • milk composition

Submitted on February 23, 1990
Accepted on July 25, 1990




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
T. C. Jenkins and M. A. McGuire
Major advances in nutrition: impact on milk composition.
J Dairy Sci, April 1, 2006; 89(4): 1302 - 1310.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
S. L. Boken, C. R. Staples, L. E. Sollenberger, T. C. Jenkins, and W. W. Thatcher
Effect of Grazing and Fat Supplementation on Production and Reproduction of Holstein Cows
J Dairy Sci, December 1, 2005; 88(12): 4258 - 4272.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
H. V. Petit, C. Germiquet, and D. Lebel
Effect of Feeding Whole, Unprocessed Sunflower Seeds and Flaxseed on Milk Production, Milk Composition, and Prostaglandin Secretion in Dairy Cows
J Dairy Sci, November 1, 2004; 87(11): 3889 - 3898.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
L. Doepel, D. Pacheco, J. J. Kennelly, M. D. Hanigan, I. F. Lopez, and H. Lapierre
Milk Protein Synthesis as a Function of Amino Acid Supply
J Dairy Sci, May 1, 2004; 87(5): 1279 - 1297.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1991 by the American Dairy Science Association ®.