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Changes in the body composition of cattle exhibiting compensatory growth and the modifying effects of grazing management

Published online by Cambridge University Press:  02 September 2010

R. D. Baker ,
N. E. Young  and
J. A. Laws
R. D. Baker
Affiliation:
Animal and Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
N. E. Young
Affiliation:
Animal and Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
J. A. Laws
Affiliation:
Animal and Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
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Abstract

Friesian steer calves born in August were reared from 3 to 7 months of age on either a low (OL) or high (OH) plane of nutrition. A further group born in October (YH) was also reared on a high plane. At grazing, the performance of calves of the same age but different weights (OL v. OH) or the same weight but different ages (OL v. YH) were compared at two levels of herbage allowance, either 30 or 60 kg dry matter per kg live weight. During the winter, the H groups received silage and concentrate and the L group was given silage only. The OL group had a higher concentration of fat and a lower concentration of water in the empty body at the end of the winter than did the OH and YH groups respectively.

Compensatory growth was exhibited by the OL group at both herbage allowances. Differences in the live-weight and empty body-weight gains of OL and OH cattle could be explained almost entirely by differences in the energy content of the gains whereas this was only partially so when the OL and YH groups were compared. The results indicate that YH cattle had lower herbage intakes even though they were of similar weight to OL cattle.

It was concluded that silage nitrogen is used less efficiently by cattle than is generally assumed and that the levels of gut fill and energy content of the live-weight gains in this experiment were not consistent with the general values suggested by the Agricultural Research Council (1980).

Type
Research Article
Information
Animal Production , Volume 41 , Issue 3 , December 1985 , pp. 309 - 321
Copyright
Copyright © British Society of Animal Science 1985

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