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Journal of Animal Science, Vol 79, Issue 1 148-154, Copyright © 2001 by American Society of Animal Science

EVALUATION STUDIES

Effects of dietary fermentable carbohydrates on energy metabolism in group-housed sows

M. M. Rijnen, M. W. Verstegen, M. J. Heetkamp, J. Haaksma and J. W. Schrama
Adaptation Physiology Group, Wageningen Institute of Animal Sciences, Wageningen University and Research, The Netherlands. martin.rijnen@alg.vv.wag-ur.nl

The effect of dietary nonstarch polysaccharide (NSP) content on the metabolic rate in group-housed sows was studied. Twelve groups of six nonpregnant sows were each fed one of four experimental diets similar in composition except for the starch and NSP content. Exchanging sugar beet pulp silage (SBPS) for tapioca created the difference in starch and NSP ratio in the diet. On a DM basis, diets contained 0, 10, 20, or 30% SBPS. Sows were group-housed and fed at 1.30 times the assumed maintenance energy requirements. Nitrogen and energy balances were measured per group during a 7-d experimental period, which was preceded by a 33-d adaptation period. Both digestibility and metabolizability of energy decreased with increasing dietary SBPS content (P < 0.05). Heat production and energy retention were unaffected by the exchange of starch for NSP (P > 0.1). Based on energy retention data and apparent fecal digestibilities of crude protein, crude fat, starch, and NSP, the estimated net energy value of fermented NSP was 13.4 kJ/g. The present study shows that group-housed sows are capable of using energy from fermented NSP (i.e., NSP from SBPS) as efficiently as energy from digested starch (i.e., starch from tapioca).


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Copyright © 2001 by the American Society of Animal Science.