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Retention time of chromium-labelled feed particles and of water in the gut of sheep given hay and concentrate at maintenance

Published online by Cambridge University Press:  24 July 2007

J. E. Lindberg
J. E. Lindberg
Affiliation:
Department of Animal Nutrition and Management, Swedish University of AgriculturalSciences, S-750 07 Uppsala, Sweden
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Abstract

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1. Sheep were given a diet of 400 g chopped grass hay/d and 500 g crushed barley/d in three equal meals. The mean retention time in the whole gut (MRT) and the rumen retention time (RRT) of chromium-labelled feed particles and of water were estimated from marker concentrations in faecal samples.

2. MRT of Cr-labelled hay (Cr-H), barley hulls (Cr-Bh), crushed peas (Pisum sativum) (Cr-CP) and rapeseed meal (Cr-RSM) were 53.5, 52.3, 44.3 and 37.0 h respectively when estimated from total faecal collections. The estimates obtained from spot samples of faeces were almost identical.

3. RRT of Cr-H, Cr-Bh, Cr-CP, Cr-RSM (Expts 1, 2 and 3) and Cr-labelled cottonseed meal (Cr-CSM) was 35.9, 36.7, 25.3, 18.8, 19.8, 22.8 and 25.3 h respectively.

4. The Cr-labelled feed particles showed marked variations in density in water (Dω). However, both MRT and RRT were closely related to Dω, (r—0.88 and —0.95 respectively).

5. Rumen outflow rates of Cr-RSM in individual animals were related to the rumen outflow rates of water (r 0.76).

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 53 , Issue 3 , May 1985 , pp. 559 - 567
Copyright
Copyright © The Nutrition Society 1985

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