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A study of the effect of exposure in the reticulo-rumen of the cow on the strength of cotton, grass, hay and straw

Published online by Cambridge University Press:  09 March 2007

E. W. Evans ,
J. Burnett  and
J. A. Bines
E. W. Evans
Affiliation:
National Institute for Research in Dairying, Shinfield Rending RG2 9AT
J. Burnett
Affiliation:
National Institute for Research in Dairying, Shinfield Rending RG2 9AT
J. A. Bines
Affiliation:
National Institute for Research in Dairying, Shinfield Rending RG2 9AT
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Abstract

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1. Changes in strength of cotton, Italian ryegrass leaf, hay stem and barley-straw stem on immersion in the contents of the reticulo-rumen, at two sites in the rumen and at one site in the reticulum, for periods of up to 56 h were measured using a cow on a hay diet. Specimens of the fibrous materials were immersed in the rumen digesta in such a way that they were not damaged by agitation or by rumination.

2. Load-to-fracture and elongation were measured on a machine using a constant-speed cross-head at a strain of about 10−3/s. The ratio strength:density (breaking load/mass per unit length) was determined.

3. Leaf of Italian ryegrass and stem of hay and of barley straw had strengths of about 37, 150 and 210 MN/m2. They lost strength at different rates when immersed in the rumen digesta, the times to half strength being in the ratio grass: hay: straw = 1:1.9:3.8. The similarity of this ratio to that for total time for eating and ruminating as given by Balch (1969), namely 1:2.0:3.5, for similar materials was noted.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 31 , Issue 3 , May 1974 , pp. 273 - 284
Copyright
Copyright © The Nutrition Society 1974

References

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