| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Animal and Dairy Science, The University of Georgia, Tifton 31793-0748
2 Chandler & Associates, Dresden, TN 38225
3 College of Veterinary Medicine, Department of Large Animal Medicine, The University of Georgia, Athens 30602-7385
4 Department of Animal and Dairy Science, The University of Georgia, Athens 30602-2771
Corresponding Author: J. K. Bernard; e-mail: jbernard{at}tifton.cpes.peachnet.edu.
Four lactating Jersey cows fitted with ruminal and duodenal cannulae were used in a 4 x 4 Latin square design trial to determine the effect of supplemental lysine in diets containing dry ground (GC) or steam-flaked (SFC, 360 g/L) corn on ruminal fermentation and amino acid (AA) flow to the duodenum. Supplemental L-lysine-HCL provided 10 g/d of additional Lys to the total mixed rations. There were no interactions between supplemental Lys and corn source. Supplemental Lys increased Lys intake, but did not alter nutrient intake and digestibility or N flow to the duodenum. Intake of dry matter (DM), organic matter (OM), and neutral detergent fiber (NDF) and ruminal digestibility of starch tended to be higher, whereas ruminal digestibility of DM, OM, acid detergent fiber, and NDF was lower for diets supplemented with SFC compared with GC. Whole-tract digestibility was similar for both corn supplements. Ruminal pH and molar proportions of volatile fatty acids were not affected by supplemental Lys or corn source; however, ruminal NH3 concentrations were lowest when SFC was fed. Intake of N tended to be higher and the flow of total N and individual AA to the duodenum was higher for diets supplemented with SFC. There was a trend for increased flow of microbial N for diets supplemented with SFC. Supplemental L-lysine-HCL did not alter ruminal fermentation, flow of amino acid to the small intestine, or nutrient digestibility, but feeding SFC reduced ruminal fiber digestion and increased microbial protein synthesis and flow of amino acid to the duodenum.
Key Words: amino acid • steam-flaked corn • digestibility • supplemental lysine
Abbreviation key: GC = ground corn, SFC = steam-flaked corn
This article has been cited by other articles:
|
|
 |
|
  K. M. Cooke, J. K. Bernard, and J. W. West Performance of Dairy Cows Fed Annual Ryegrass Silage and Corn Silage with Steam-Flaked or Ground Corn J Dairy Sci, June 1, 2008; 91(6): 2417 - 2422. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. C. Marini, D. G. Fox, and M. R. Murphy Nitrogen transactions along the gastrointestinal tract of cattle: A meta-analytical approach J Anim Sci, March 1, 2008; 86(3): 660 - 679. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Z. H. Sun, Z. L. Tan, S. M. Liu, G. O. Tayo, B. Lin, B. Teng, S. X. Tang, W. J. Wang, Y. P. Liao, Y. F. Pan, et al. Effects of dietary methionine and lysine sources on nutrient digestion, nitrogen utilization, and duodenal amino acid flow in growing goats J Anim Sci, December 1, 2007; 85(12): 3340 - 3347. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
