| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 US Dairy Forage Research Center, USDA, Agricultural Research Service and Department of Dairy Science, University of Wisconsin, Madison 53706
An experiment was conducted to test the hypothesis that cows in early lactation are more likely to be limited by protein than by energy when fed diets containing high proportions of alfalfa silage. After a 2-wk covariate period, 26 multiparous cows were assigned to one of four treatments from wk 3 to 14 of lactation. Treatments were a positive control diet with equal amounts of forage and grain (DM basis), an all forage diet serving as negative control, and two test diets with 75% forage and 25% of either high moisture ear corn or expeller soybean meal. The latter two diets were equal in energy content but differed in the amount of protein made available for absorption in the small intestine. Alfalfa silage was the only forage in all diets. Milk yield with the four diets averaged 36.3, 25.5, 32.1, and 35.5 kg/d, and milk protein content was 2.93, 2.63, 2.77, and 2.75%. The negative control diet severely depressed milk protein content, which was not restored totally by either test diet. We concluded that absorbable protein supply to the intestine is first-limiting when high alfalfa silage diets are fed to cows in early lactation.
Key Words: alfalfa silage • energy • expeller soybean meal • protein
Submitted on September 17, 1992
Accepted on February 8, 1993
This article has been cited by other articles:
|
|
 |
|
  C. Lanzas, L. O. Tedeschi, S. Seo, and D. G. Fox Evaluation of Protein Fractionation Systems Used in Formulating Rations for Dairy Cattle J Dairy Sci, January 1, 2007; 90(1): 507 - 521. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. A. Broderick and W. J. Radloff Effect of Molasses Supplementation on the Production of Lactating Dairy Cows Fed Diets Based on Alfalfa and Corn Silage J Dairy Sci, September 1, 2004; 87(9): 2997 - 3009. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. A. Wattiaux In Appreciation of Dr. Larry D. Satter--How a Career-Long Effort in Nutrition Research Will Serve Livestock Production in the Future J Dairy Sci, July 1, 2004; 87(13_suppl): E1 - 5. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. A. Broderick Effects of Varying Dietary Protein and Energy Levels on the Production of Lactating Dairy Cows J Dairy Sci, April 1, 2003; 86(4): 1370 - 1381. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
