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Influence of body condition on maintenance energy requirements of Charolais cows

Published online by Cambridge University Press:  02 September 2010

I. Ortigues ,
M. Petit  and
J. Agabriel
I. Ortigues
Affiliation:
Laboratoire Croissance et Métabolismes des Herbivores, INRA Theix, 63122 Saint-Genès Champanelle, France
M. Petit
Affiliation:
aboratoire Adaptation des Herbivores aux Milieux, INRA Theix, 63122 Saint-Genès Champanelle, France
J. Agabriel
Affiliation:
aboratoire Adaptation des Herbivores aux Milieux, INRA Theix, 63122 Saint-Genès Champanelle, France
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Abstract

The objective of the experiment was to test whether maintenance energy requirements of non-lactating, non-pregnant beef cows increased with body fatness. Twelve Charolais cows were initially fed to attain either lean or fat body condition. Subsequently, over a period of 66 days food allowances were regularly adjusted for zero live-weight change. For the following 76 days, lean and fat cows received either 400 or 553 kJ metabolizable energy (ME) per kg initial live weight 0·75 per day, respectively. Fat cows maintained their body weight and composition whereas lean cows lost 296 g body weight, 221 g lipid and 65 g protein daily. Calculated maintenance energy requirements averaged 516 and 536kJ ME per kg live weight 0·75 per day for lean and fat cows respectively but were not significantly affected by body fatness. Diet dry matter, organic matter, crude protein and energy apparent digestibilities but not acid-detergent fibre digestibility were significantly higher in fat animals.

Keywords

beef cowsbody conditionmaintenance requirements
Type
Research Article
Information
Animal Production , Volume 57 , Issue 1 , August 1993 , pp. 47 - 53
Copyright
Copyright © British Society of Animal Science 1993

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