| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Dairy Science, University of Wisconsin, Madison 53706
2 US Dairy Forage Research Center, Madison, WI 53706 and Department of Dairy Science, University of Wisconsin, Madison 53706
3 USDA-Agricultural Research Service, Madison, WI 53706
We conducted two experiments to evaluate the effects of corn supplementation, source of corn, and corn particle size on performance and nutrient utilization of lactating dairy cows. In experiment 1, treatments were 1) direct-cut grass-legume forage without supplement, 2) direct-cut forage plus 10 kg DM of ground dry shelled corn-based concentrate, and 3) direct-cut forage plus 10 kg DM of coarsely ground high moisture ear corn-based concentrate. In experiment 2, treatments were 1) direct-cut grass-legume forage plus 10 kg DM of ground dry shelled corn-based concentrate, 2) direct-cut forage plus 10 kg DM of coarsely ground high moisture ear corn-based concentrate, and 3) direct-cut forage plus 10 kg of DM finely ground high moisture ear corn-based concentrate. Both experiments were designed as 3 x 3 Latin squares replicated three times. In experiment 1, yields of milk and milk protein increased with concentrate supplementation, but were not affected by source of corn. Solids-corrected milk yield tended to increase with grain supplementation. Dry matter intake increased with concentrate supplementation, but was not affected by source of corn or corn particle size. Corn supplements decreased ruminal pH and acetate to propionate ratio and increased ruminal propionate concentration. Grain supplements reduced ruminal ammonia concentration,6 increased concentration of urine allantoin, and increased the urinary allantoin to creatinine ratio. In the second study, fine grinding of high moisture corn reduced fecal starch plus free glucose levels and tended to increase its apparent digestibility. In both experiments, starch plus free glucose intake was higher on the diets with dry corn, but its utilization was not affected by source of corn.
Key Words: dairy • starch • grain processing • ruminant
Submitted on June 12, 2000
Accepted on September 14, 2000
This article has been cited by other articles:
|
|
 |
|
  Q. Zebeli, J. Dijkstra, M. Tafaj, H. Steingass, B. N. Ametaj, and W. Drochner Modeling the Adequacy of Dietary Fiber in Dairy Cows Based on the Responses of Ruminal pH and Milk Fat Production to Composition of the Diet J Dairy Sci, May 1, 2008; 91(5): 2046 - 2066. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. B. Kristensen, J. Sehested, S. K. Jensen, and M. Vestergaard Effect of Milk Allowance on Concentrate Intake, Ruminal Environment, and Ruminal Development in Milk-Fed Holstein Calves J Dairy Sci, September 1, 2007; 90(9): 4346 - 4355. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Bargo, G. A. Varga, L. D. Muller, and E. S. Kolver Pasture Intake and Substitution Rate Effects on Nutrient Digestion and Nitrogen Metabolism during Continuous Culture Fermentation J Dairy Sci, April 1, 2003; 86(4): 1330 - 1340. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Bargo, L. D. Muller, E. S. Kolver, and J. E. Delahoy Invited Review: Production and Digestion of Supplemented Dairy Cows on Pasture J Dairy Sci, January 1, 2003; 86(1): 1 - 42. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Bargo, L. D. Muller, G. A. Varga, J. E. Delahoy, and T. W. Cassidy Ruminal Digestion and Fermentation of High-Producing Dairy Cows with Three Different Feeding Systems Combining Pasture and Total Mixed Rations J Dairy Sci, November 1, 2002; 85(11): 2964 - 2973. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Bargo, L. D. Muller, J. E. Delahoy, and T. W. Cassidy Milk Response to Concentrate Supplementation of High Producing Dairy Cows Grazing at Two Pasture Allowances J Dairy Sci, July 1, 2002; 85(7): 1777 - 1792. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
