J. Anim Sci.
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J. Anim Sci. 1950. 9:531-539.
© 1950 American Society of Animal Science
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Some Effects of Forage Composition on Its Nutritive Value When Cut and Fed Green to Steers and Wethers, as Determined Conventionally and by the Lignin Ratio1

R. M. Forbes2 and W. P. Garrigus

Kentucky Agricultural Experiment Station

Abstract

From the results of digestion and metabolism experiments, employing steers and wethers, in which calculations were made by conventional and by lignin-ratio methods, the following observations may be made:

  1. Variation in organic-matter digestibility is most closely associated with the lignin content of the forage.
  2. Regression equations expressing the relationship of lignin content to organic-matter digestibility are statistically similar whether calculated from conventional or lignin-ratio data from digestion trials, or from gracing experiments employing the lignin-ratio method of calculation.
  3. The percentage of digestible energy of green forages that is metabolizable varies most consistently with the digestible carbohydrate content of the forage.
  4. Significant negative digestion coefficients for lignin are usually found when green forages are fed to steers and wethers and the lignin is analyzed by the method of Ellis, Matrone and Maynard.

Footnotes

1 The investigation reported in this paper is in connection with a project of the Kentucky Agricultural Experiment Station and is published by permission of the director.

2 Formerly Associate Professor of Animal Husbandry, University of Kentucky, now Associate Professor of Animal Nutrition, University of Illinois.






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Copyright © 1950 by the American Society of Animal Science.