| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Dairy and Animal Science, The Pennsylvania State University, University Park 16802
Multiparous Holstein cows in late gestation were used in a completely randomized design to test the effects of prepartum protein supply on prepartum N balance, blood metabolite and hormone concentrations, and postpartum intake and milk production. Cows were assigned to one of three isocaloric diets that differed in amount of total dietary crude protein (CP) (10.6, 12.7, or 14.5% of dry matter) but not in CP degradability or solubility. All diets contained the following ingredients: corn silage, chopped grass hay, ground corn, soybean meal, expeller soybean meal, minerals, and vitamins. Following parturition, all cows were offered a similar diet. Nitrogen balance was measured on d 12 to 7 prior to the expected calving date. Cows were bled on d 5 prior to the expected calving date from just prior to feeding to 8 h postfeeding. As dietary CP increased, plasma glucose concentrations increased linearly, but no change was detected in plasma nonesterified fatty acids or serum insulin concentrations. Nitrogen intake, apparent and true digestibilities, fecal and urinary concentrations, and N balance increased as the concentration of dietary protein increased. The efficiency of absorbed protein utilization decreased as protein intake increased. No change in postpartum intake or milk production was observed. An increase in N retention in late gestation cows that were in a positive N balance did not increase postpartum milk production.
Key Words: protein • dry cow • protein reserves • metabolites
Submitted on September 22, 1997
Accepted on January 26, 1998
This article has been cited by other articles:
|
|
 |
|
  S. Agenas, E. Burstedt, and K. Holtenius Effects of Feeding Intensity During the Dry Period. 1. Feed Intake, Body Weight, and Milk Production J Dairy Sci, March 1, 2003; 86(3): 870 - 882. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Hayirli, R. R. Grummer, E. V. Nordheim, and P. M. Crump Animal and Dietary Factors Affecting Feed Intake During the Prefresh Transition Period in Holsteins J Dairy Sci, December 1, 2002; 85(12): 3430 - 3443. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. J. Richards, A. F. Branco, D. W. Bohnert, G. B. Huntington, M. Macari, and D. L. Harmon Intestinal starch disappearance increased in steers abomasally infused with starch and protein J Anim Sci, December 1, 2002; 80(12): 3361 - 3368. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Doepel, H. Lapierre, and J. J. Kennelly Peripartum Performance and Metabolism of Dairy Cows in Response to Prepartum Energy and Protein Intake J Dairy Sci, September 1, 2002; 85(9): 2315 - 2334. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. F. Park, J. E. Shirley, E. C. Titgemeyer, M. J. Meyer, M. J. VanBaale, and M. J. VandeHaar Effect of Protein Level in Prepartum Diets on Metabolism and Performance of Dairy Cows J Dairy Sci, July 1, 2002; 85(7): 1815 - 1828. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
