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Relations between passage rates of rumen fluid and particulate matter and foam production in rumen contents of cattle fed on different diets ad lib.

Published online by Cambridge University Press:  09 March 2007

E. K. Okine ,
G. W. Mathison  and
R. T. Hardin
E. K. Okine
Affiliation:
Department of Animal Science, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada
G. W. Mathison
Affiliation:
Department of Animal Science, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada
R. T. Hardin
Affiliation:
Department of Animal Science, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada
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Abstract

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1. A group of six cattle, three of which had a non-bloating history (group A) and had been ruminally cannulated for the previous 2 years, and three with a history of being bloat-prone (group B) and which had been ruminally cannulated only 3 months before the study, were fed ad lib. on chopped lucerne (Medicago sotiva) hay, lucerne pellets, or a 100 g chopped hay and 900 g rolled barley grain/kg diet over three periods of 30 d each. Flow of rumen digesta, by reference to CoEDTA and chromium-mordanted fibres, and foam production from samples of rumen contents were measured.

2. Samples of rumen contents (50 ml) from group A produced foam heights of 150 and 60 mm, 2 and 4 h after feeding respectively, compared with 240 and 150 mm for group B (P < 0.05).

3. The fractional passage rate of the 1-2 mm particles mordanted with Cr did not differ (P > 0.05) between groups.

4. The fractional outflow rates (FOR) for CoEDTA 0-2 h and 2-7 h after feed was offered were 0.205 and 0.160/h for group A and 0.093 and 0.086/h for group B respectively (P < 0.05).

5. Rumen-fluid FOR 0-2 h and 2-7 h after provision of feed were significantly (P < 0.05) inversely correlated (r -0.74 and -0.85 respectively) with the amount of foam produced from rumen contents at these times.

Type
Research Article
Information
British Journal of Nutrition , Volume 61 , Issue 2 , March 1989 , pp. 387 - 395
Copyright
Copyright © The Nutrition Society 1989

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