| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Department of Dairy Science
Department of Agricultural Engineering, University of Wisconsin, Madison 53706
ABSTRACT
Effects of forage intake and particle length on chewing time were investigated. Two ratios of forage to concentrate, 33:67 and 50:50, and three lengths of forage particles were compared in two 3 x 3 Latin squares repeated a second year. Distribution of forage particle length was determined with an oscillating screen particle separator. Weighted mean particle lengths, .31, .43, and .51 cm, were measured for the three forages.
Actual intakes of forage dry matter and fibrous constituents were multiplied by mean particle length of the forage to obtain intakes adjusted (kg.cm) for particle length. Although there were no differences in intake of forage dry matter, or of neutral detergent fiber and acid detergent fiber between forage particle lengths, adjustment for particle length revealed that total chewing time was associated with mean particle length of the consumed forage. Total chewing time affected concentration of rumen volatile fatty acids, pH, and milk fat percentage between ratios of forage to concentrate.
Roughage indexes based on adjusted forage intake or intake of forage fibrous constituents are reported. The quadratic equation that described the roughage index (
) for the adjusted forage intake was = 365.2 – 69.6X + 4.73X2.
1 Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by Hatch Project 6003 and Industrial Gifts.
This article has been cited by other articles:
|
|
 |
|
  D. H. Kleinschmit, J. L. Anderson, D. J. Schingoethe, K. F. Kalscheur, and A. R. Hippen Ruminal and Intestinal Degradability of Distillers Grains plus Solubles Varies by Source J Dairy Sci, June 1, 2007; 90(6): 2909 - 2918. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. J. Couderc, D. H. Rearte, G. F. Schroeder, J. I. Ronchi, and F. J. Santini Silage chop length and hay supplementation on milk yield, chewing activity, and ruminal digestion by dairy cows. J Dairy Sci, September 1, 2006; 89(9): 3599 - 3608. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. T. Yansari, R. Valizadeh, A. Naserian, D. A. Christensen, P. Yu, and F. E. Shahroodi Effects of Alfalfa Particle Size and Specific Gravity on Chewing Activity, Digestibility, and Performance of Holstein Dairy Cows J Dairy Sci, November 1, 2004; 87(11): 3912 - 3924. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. A. Coverdale, H. D. Tyler, J. D. Quigley III, and J. A. Brumm Effect of Various Levels of Forage and Form of Diet on Rumen Development and Growth in Calves J Dairy Sci, August 1, 2004; 87(8): 2554 - 2562. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. M. Calberry, J. C. Plaizier, M. S. Einarson, and B. W. McBride Effects of Replacing Chopped Alfalfa Hay with Alfalfa Silage in a Total Mixed Ration on Production and Rumen Conditions of Lactating Dairy Cows J Dairy Sci, November 1, 2003; 86(11): 3611 - 3619. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. A. Beauchemin, W. Z. Yang, and L. M. Rode Effects of Particle Size of Alfalfa-Based Dairy Cow Diets on Chewing Activity, Ruminal Fermentation, and Milk Production J Dairy Sci, February 1, 2003; 86(2): 630 - 643. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. W. Clark and L. E. Armentano Influence of Particle Size on the Effectiveness of the Fiber in Alfalfa Silage J Dairy Sci, November 1, 2002; 85(11): 3000 - 3007. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. A. Holden, G. A. Varga, G. A. Jung, and J. A. Shaffer Comparison of `Grasslands Puna' Chicory and Orchardgrass for Multiple Harvests at Different Management Levels Agron. J., March 1, 2000; 92(2): 191 - 194. [Abstract] [Full Text]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
