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Performance of British Saanen, Boer × British Saanen and Anglo-Nubian castrated male kids from 8 weeks to slaughter at 28, 33 or 38 kg live weight

Published online by Cambridge University Press:  02 September 2010

M. J. Gibb ,
J. E. Cook  and
T. T. Treacher
M. J. Gibb
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead SL6 5LR
J. E. Cook
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead SL6 5LR
T. T. Treacher
Affiliation:
AFRC Institute of Grassland and Environmental Research, Hurley, Maidenhead SL6 5LR
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Abstract

The performance of British Saanen, Boer × British Saanen and Anglo-Nubian kids from weaning to slaughter at 28, 33 or 38 kg live weight (LW) was examined in a 3 × 3 factorial experiment. Kids were reared on a concentrate and hay ration, after weaning at 8 weeks of age. Intakes were measured individually. At slaughter, carcasses and body fractions were weighed, left half-carcasses were dissected into muscle, fat and bone, and the carcass and non-carcass fractions were analysed chemically. There ivas no significant effect of breed type on mean daily intakes, but there was a significant breed-type effect on mean daily LW gains in the order British Saanen > Boer × British Saanen > Anglo-Nubian kids. Compared with the pure British Saanen kids, the Anglo-Nubian kids produced heavier carcasses yielding more muscle and less subcutaneous and intermuscular fat at each slaughter weight. By contrast, the Boer × British Saanen carcasses contained proportionately more fat, mainly intermuscular fat, than the British Saanen when slaughtered at 28 or 33 kg LW. When taken on to slaughter at 38 kg LW, the Boer × British Saanen kids showed little further increase in fat deposition at the internal and intermuscular sites compared with the British Saanens, resulting in carcasses with slightly more subcutaneous fat but lower overall carcass fat content.

Keywords

body compositioncarcass compositiongoats and goat breeds

Information

Type
Research Article
Information
Animal Production , Volume 57 , Issue 2 , October 1993 , pp. 263 - 271
Copyright
Copyright © British Society of Animal Science 1993

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