| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Animal Sciences, University of Illinois, Urbana 61 801
In Experiment 1, three ruminally and duodenally cannulated cows were used to assess the extent of ruminal protection and postruminal release of Met from ruminally protected Met using a polyester bag technique. The ruminally protected Met contained 85.1% DL-Met (wt/wt). Ruminal disappearance of Met averaged 5.8, 8.1, 21.8, 37.5, and 87.5% after 3, 6, 12, 24, and 96 h of incubation, respectively. Postruminal disappearance of Met from bags inserted in the duodenum after treatment with pepsine·HCl averaged 63.4, 62.6, 51.6, 43.6, and 8.8% for bags incubated in the rumen for 3, 6, 12, 24, and 96 h, respectively. In Experiment 2, 12 cows were fed either 0 or 20 g/d of ruminally protected Met from 7 to 10 d prepartum until 18 wk postcalving. Cows were fed the same total mixed diet. The DMI; yields of milk, CP, and SNF; and percentages of fat, CP, and SNF in milk were not affected by treatment. However, yields of fat and 3.5% FCM increased when ruminally protected Met was fed. Milk N components were not affected by treatment. Concentrations of Met increased in plasma when ruminally protected Met was fed. The mechanism for the increased production of milk fat and 3.5% FCM when ruminally protected Met was fed is unknown.
Key Words: methionine • ruminally protected amino acids • dairy cows
Submitted on April 26, 1995
Accepted on December 8, 1995
This article has been cited by other articles:
|
|
 |
|
  S. Davidson, B. A. Hopkins, J. Odle, C. Brownie, V. Fellner, and L. W. Whitlow Supplementing Limited Methionine Diets with Rumen-Protected Methionine, Betaine, and Choline in Early Lactation Holstein Cows J Dairy Sci, April 1, 2008; 91(4): 1552 - 1559. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. Berthiaume, M. C. Thivierge, R. A. Patton, P. Dubreuil, M. Stevenson, B. W. McBride, and H. Lapierre Effect of Ruminally Protected Methionine on Splanchnic Metabolism of Amino Acids in Lactating Dairy Cows J Dairy Sci, May 1, 2006; 89(5): 1621 - 1634. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. T. Socha, D. E. Putnam, B. D. Garthwaite, N. L. Whitehouse, N. A. Kierstead, C. G. Schwab, G. A. Ducharme, and J. C. Robert Improving Intestinal Amino Acid Supply of Pre- and Postpartum Dairy Cows with Rumen-Protected Methionine and Lysine J Dairy Sci, March 1, 2005; 88(3): 1113 - 1126. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. L. Girard, H. Lapierre, J. J. Matte, and G. E. Lobley Effects of Dietary Supplements of Folic Acid and Rumen-Protected Methionine on Lactational Performance and Folate Metabolism of Dairy Cows J Dairy Sci, February 1, 2005; 88(2): 660 - 670. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. R. Overton and M. R. Waldron Nutritional Management of Transition Dairy Cows: Strategies to Optimize Metabolic Health J Dairy Sci, July 1, 2004; 87(13_suppl): E105 - 119. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. S. Piepenbrink, A. L. Marr, M. R. Waldron, W. R. Butler, T. R. Overton, M. Vazquez-Anon, and M. D. Holt Feeding 2-Hydroxy-4-(Methylthio)-Butanoic Acid to Periparturient Dairy Cows Improves Milk Production but not Hepatic Metabolism J Dairy Sci, April 1, 2004; 87(4): 1071 - 1084. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
