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Effect of polyethylene glycol on in vitro degradability ofnitrogen and microbial protein synthesis fromtannin-rich browse and herbaceous legumes

Published online by Cambridge University Press:  09 March 2007

Y. Ramonet ,
J. van Milgen ,
J. Y. Dourmad ,
S. Dubois ,
M. C. Meunier-Salaün  and
J. Noblet
Y. Ramonet
Affiliation:
Institut National de la Recherche Agronomique, Station de Recherches Porcines, 35590, St-Gilles, France
J. Y. Dourmad
Affiliation:
Institut National de la Recherche Agronomique, Station de Recherches Porcines, 35590, St-Gilles, France
S. Dubois
Affiliation:
Institut National de la Recherche Agronomique, Station de Recherches Porcines, 35590, St-Gilles, France
M. C. Meunier-Salaün
Affiliation:
Institut National de la Recherche Agronomique, Station de Recherches Porcines, 35590, St-Gilles, France
J. Noblet
Affiliation:
Institut National de la Recherche Agronomique, Station de Recherches Porcines, 35590, St-Gilles, France
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Abstract

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A low (L) and high-fibre (H) diet were fed to six multiparous sows during gestation in a 2 × 2 repeated Latin square design. A single meal per day was given that provided 37·2 MJ digestible energy/d. The kinetics of heat production (HP) and its partitioning (fasting HP, activity HP, and thermic effect of feeding (TEF)) were determined. The TEF was partitioned between a dynamic component (TEFst) and a constant component (TEFlt). Digestibility of energy and nutrients was lower for the diet H. In spite of the lower metabolisable energy (ME) intake (33·9 v. 35·4 MJ/d for diets H and L respectively), HP was higher for diet H (30·5 v. 28·9 MJ/d) resulting in a lower energy retention. The estimated fasting HP was 270 kJ/kg body weight0·75 per d at day 0 of gestation and increased with advancement of pregnancy. The TEFlt was not significantly different from zero for diet L, but represented 4·1 % of ME intake for diet H. The TEFst was not affected by the diet but diet H delayed the postprandial peak of HP. Total TEF was higher for diet H than for diet L (11·7 v. 8·2 % of ME intake). The longer duration of eating with diet H was compensated for by less physical activity between meals, so that activity HP was equivalent for both diets. The activity HP represented 20 % of ME intake but was variable between sows. The ME requirements for maintenance averaged 440 kJ/kg body weight0·75per d. Feeding high-fibre diets increases HP, delays the postprandial peak of HP and maintains the basal HP at a higher level.

Keywords

High-fibre dietHeat productionSowPregnancyPhysical activity
Type
Research Article
Information
British Journal of Nutrition , Volume 84 , Issue 1 , July 2000 , pp. 85 - 94
Copyright
Copyright © The Nutrition Society 2000

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