J. Anim Sci.
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J. Anim Sci. 1978. 46:753-760.
© 1978 American Society of Animal Science
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Apparent Nutrient Digestibility by Lactating Angus Cows as Related to Certain Body Parameters1

W. Warren Gill2, Karl M. Barth and Will T. Butts3

University of Tennessee, Knoxville 37916,4

Abstract

The relation between apparent digestibility determined by the lignin ratio technique and several physical and productive characteristics in beef cows fed a grass-silage and alfalfa-pellet diet was studied. Twenty-two mature lactating beef cows (with calves) were randomly selected to provide a wide range of weights and heights.

A significant (P<.01) negative relationship was found between cow body weight and apparent crude protein digestibility (r = –.71). This relationship was curvilinear, i.e., as cow body weight increased, crude protein digestibility decreased at an increasing rate. Nonsignificant (P>.05) positive coefficients of correlation of .30, .34 and .31 between cow height at withers and apparent digestion coefficients of dry matter, acid-detergent fiber and gross energy, respectively, were obtained.

Average daily gains of calves were positively correlated with dry matter, acid-detergent fiber and gross energy digestibilities of their dams. Correlation coefficients were .46 (P<.05), .60 (P<.01) and .41 (approaching significance, P>.05), respectively.

Footnotes

1 Published with the permission of the Dean of the University of Tennessee Agricultural Experiment Station.

2 Present address: Department of Animal Science, University of Kentucky, Lexington 40506.

3 USDA-ARS, University of Tennessee, Knoxville.

4 Department of Animal Science.






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Copyright © 1978 by the American Society of Animal Science.