HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Casper, D. P. Articles by Schingoethe, D. J. Search for Related Content PubMed PubMed Citation Articles by Casper, D. P. Articles by Schingoethe, D. J.

Model to Describe and Alleviate Milk Protein Depression in Early Lactation Dairy Cows Fed a High Fat Diet¹

Dairy Science Department, South Dakota State University, Brookings 57007-0647

ABSTRACT

The depression of milk protein percentages for cows fed high fat diets in early lactation is a major problem facing the dairy industry. In order to describe more fully the mechanism involved, data involved 97 cow observations were summarized. Cows were fed diets containing corn-soybean meal or additional fat in the form of whole oilseeds as the main ingredients in the concentrate mix. Blood samples from the tail artery and subcutaneous abdominal vein were taken approximately 6- to 8-wk postpartum for amino acid analyses. Production of milk during the week of blood sampling was increased (36.9 and 39.6 kg/d) approximately 7.3% but milk protein percentages (2.91 and 2.79) were reduced for cows fed added fat. Intake of DM (21.1 and 21.4 kg/d) and BW (605 and 608 kg) were similar. Uptake of amino acids by the mammary gland, as measured by arteriovenous differences, was numerically lower for all essential amino acids and significantly reduced for histidine, isoleucine, leucine, phenylalanine, threonine, valine, and total essential amino acids for cows fed added fat. It is proposed that added fat inhibits somatotropin release from the anterior pituitary, thereby reducing mammary gland uptake of amino acids because of the role of somatotropin in aiding amino acid uptake. Administration of exogenous somatotropin with added fat diets may alleviate milk protein depression associated with such diets.

¹ Published with the approval of the Director of the South Dakota Agricultural Experiment Station as Publication Number 2400 of the Journal Series.

This article has been cited by other articles:

				U. Moallem, M. Katz, A. Arieli, and H. Lehrer Effects of Peripartum Propylene Glycol or Fats Differing in Fatty Acid Profiles on Feed Intake, Production, and Plasma Metabolites in Dairy Cows J Dairy Sci, August 1, 2007; 90(8): 3846 - 3856. [Abstract] [Full Text] [PDF]

				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]