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Passage rate and total clearance rate from the rumen of cows fed on grass silages differing in cell-wall content

Published online by Cambridge University Press:  09 March 2007

Marlou W. Bosch  and
Marianne Bruining
Marlou W. Bosch
Affiliation:
Department of Animal Nutrition, Agricultural University, Haagsteeg 4, NL 6708 PM Wageningen, The Netherlands Department of Human and Animal Physiology, Agricultural University, Haarweg 10, NL 6709 PJ Wageningen, The Netherlands
Marianne Bruining
Affiliation:
Department of Animal Nutrition, Agricultural University, Haagsteeg 4, NL 6708 PM Wageningen, The Netherlands
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Abstract

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Four non-lactating, rumen-fistulated cows were fed ad lib. on two grass silages (first cut (FC) and second cut (SC)) harvested at different growth stages, resulting in different crude-protein (CP) and neutral-detergent-fibre (NDF) contents (FC, 152 g CP/kg, 515g NDF/kg and SC, 210 g CP/kg, 442 g NDF/kg). Voluntary intake and rumen contents, total as well as organic matter were higher for silage FC. Fractional passage rate from the rumen, calculated from the logarithmic decline in Cr-NDF rumen pool, was higher for silage FC (0·0395/h and 0·0446/h for silages SC and FC respectively). When fractional passage rates from the rumen were calculated by dividing the intake of indigestible organic matter by the mean rumen poo! of this fraction, the same differences between silages were found, although the actual levels were much lower (0·0258$sol;h and 0·0300/h for silages SC and FC respectively). The results from the present experiment suggest that disappearance rate from the rumen of particles with a size between 1·25 and 0·071 mm is the rate-limiting step in the control of rumen fill.

Keywords

RumenDigesta kineticsSilage
Type
Digesta kinetics and feed intake in silage-fed animals
Information
British Journal of Nutrition , Volume 73 , Issue 1 , January 1995 , pp. 41 - 49
Copyright
Copyright © The Nutrition Society 1995

References

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