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Effect of draught work on performance and metabolism of crossbred cows 2. Effect of work on roughage intake, digestion, digesta kinetics and plasma metabolites

Published online by Cambridge University Press:  02 September 2010

E. Zerbini ,
T. Gemeda ,
A. G. Wold ,
S. Nokoe  and
D. Demissie
E. Zerbini
Affiliation:
International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
T. Gemeda
Affiliation:
Institute of Agricultural Research, PO Box 2003, Addis Ababa, Ethiopia
A. G. Wold
Affiliation:
Institute of Agricultural Research, PO Box 2003, Addis Ababa, Ethiopia
S. Nokoe
Affiliation:
International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
D. Demissie
Affiliation:
Institute of Agricultural Research, PO Box 2003, Addis Ababa, Ethiopia
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Abstract

Forty pregnant F1 crossbred dairy cows (20 Friesian × Boran and 20 Simmental × Boran) were stratified in a 2 × 2 diet × work factorial arrangement (not working-not supplemented, NWNS; not working-supplemented, NWS; working-not supplemented, WNS; and working-supplemented, WS) were used to study the effect of work and diet supplementation on roughage intake, apparent digestibility of nutrients, digesta kinetics and plasma metabolites. Dry matter (DM) and organic matter (OM) intakes were greater for working than for non-working cows. Work and supplementation increased DM and OM in vivo apparent digestibility. This effect was particularly significant when comparing working cows at rest and at work. Passage rate and rumen mean retention of Cr-mordanted hay were similar for working and for nonworking cows. Liquid turn-over rate of Co-ethylene diamine tetra acetic acid (EDTA) was lower and rumen mean retention time of Co-EDTA was greater in working than in non-working cows whether supplemented or not. Working coios had lower plasma glucose during and immediately after working than non-working cows. Plasma non-esterified fatty acid (NEFA) was higher in working cows at the end of the working period and after rest between working hours. This effect was greater in non-supplemented than in supplemented cows. In working cows, β-hydroxybutyrate was lower at the end of working hours than in non-working cows. Lactate was greater in working than in non-working cows after the 3rd and 4th hours of work. Digesta kinetics could explain only partially the possible mechanisms responsible for greater roughage intake and apparent digestibility in working cows. The decrease of plasma glucose and the increase in NEFA during work indicates an increasing utilization of NEFA by muscle during consecutive working hours.

Keywords

cowsdigestibilityhay intakeplasma metaboliteswork
Type
Research Article
Information
Animal Science , Volume 60 , Issue 3 , June 1995 , pp. 369 - 378
Copyright
Copyright © British Society of Animal Science 1995

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