J. Anim Sci.
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J. Anim Sci. 1972. 34:1075-1084.
© 1972 American Society of Animal Science
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Conventional Digestion Trials vs. Nylon Bag Technique for Determining Seasonal Difference in Quality of Midland Bermudagrass Forage

M. W. Neathery1

The University of Georgia, Athens 30601

Abstract

SEVERAL workers have found dry matter disappearance (DMD) of forage determined by nylon bag technique to be highly correlated with TDN and dry matter digestibility values determined by conventional digestion trials (Lusk, Browning and Miles, 1962; Hopson, Johnson and Dehority, 1963; Lowrey et al., 1968). Specifically, this involves comparing a method which determines apparent dry matter digestibility throughout the gastrointestinal tract (conventional digestion trials) with one which shows dry matter loss from in-tureen nylon bags.

Previous comparisons have dealt mainly with dry matter digestion. There is a dearth of published data comparing digestion coefficients of nutrients, using each method. Assuming that dry matter loss from in-rumen bags is a digestibility loss, one logically may conclude that bag residue represents the non-digestible fraction. This conclusion presupposes that diets are the same as the forage being tested. Since some nutrient digestibility takes place in gastrointestinal tract areas other than the rumen, it was thought desirable to determine the correlation between the two methods in respect to apparent digestibility of these nutrients.

Footnotes

1 Dairy Science Department. The author acknowledges technical assistance of M. B. Parker. Appreciation is also expressed to H. S. Johnson, Jr., and S. R. Wilkinson for conducting the sample chemical analyses.






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Copyright © 1972 by the American Society of Animal Science.