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Rate of passage of digesta in sheep

6. The effect of level of food intake on mathematical predictions of the kinetics of digesta in the reticulorumen and intestines

Published online by Cambridge University Press:  09 March 2007

W. L. Grovum  and
V. J. Williams
W. L. Grovum
Affiliation:
Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Ontario NIG 2W2, Canada
V. J. Williams
Affiliation:
Department of Physiology, School of Rural Science, University of New England, Armidale, NSW 2351, Australia
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Abstract

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1.Five sheep were given 400, 625, 850, 1075 and 1300 g lucerne chaff/d according to a 5 × 5 Latin square design to perturbate a mathematical model describing the rate of passage of digesta in terms of rate constants for the reticulo-rumen (k1) and caecum and proximal

2.colon (k2), and a transit time (TT) for the intestines. These values were obtained from the concentration curves of51Cr EDTA and144Ce-144Pr (144Pr) excretion in faeces for comparison with similar measurements obtained directly.

3.The retention times of markers in the reticulo-rumen, caecum and proximal colon and intestines all decreased by approximately 50% as intakes were increased from 400 to 1300 g/d. For both markers, the direct and indirect measures of half-time in the reticulo-rumen were essentially identical. The predicted (indirect) values for half times in the caecum and proximal colon were smaller than the direct values (P < 0.005) but the correlations between them were significant (P < 0.01) for51Cr EDTA (r 0.66) and144Pr (r 0.78). The direct measures of transit time were smaller (P < 0.025) by 5–10% than the predicted values but correlations between them were significant (P < 0.01) for51Cr EDTA (r 0.91) and for144Pr (r 0.93). Thus the model predicted the changes produced in the rate of passage of digesta and its usefulness and limitations are discussed.

3.With144Pr 1/2k1 for the reticulo-rumen and T1/2k2 for the caecum and proximal colon were both positively correlated (P < 0.025) with the organic matter digestibilities. T1/2k2 decreased at half the rate of T1/2k1 with increasing intakes. This would have favoured compensatory digestion in the large intestine.

Type
Research Article
Information
British Journal of Nutrition , Volume 38 , Issue 3 , November 1977 , pp. 425 - 436
Copyright
Copyright © The Nutrition Society 1977

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