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Effect of breed and sex on the deposition of branched-chain fatty acids in lamb fat

Published online by Cambridge University Press:  22 November 2017

M Enser ,
J D Wood ,
P Sinnett-Smith  and
J Woolliams
M Enser
Affiliation:
AFRC Institute of Food Research, Bristol Laboratory, Langford, Bristol, BS18 7DY
J D Wood
Affiliation:
AFRC Institute of Food Research, Bristol Laboratory, Langford, Bristol, BS18 7DY
P Sinnett-Smith
Affiliation:
AFRC Institute of Animal Physiology and Genetics Research, Kings Buildings, West Mains Road, Edinburgh EH9 3JQ
J Woolliams
Affiliation:
AFRC Institute of Animal Physiology and Genetics Research, Kings Buildings, West Mains Road, Edinburgh EH9 3JQ
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Extract

The presence of high concentrations of branched-chain fatty acids in lamb fat results in soft discoloured tissue and objectionable flavours and odours. However, the factors regulating their synthesis and deposition are Incompletely understood. In some studies, but not others, excessive deposition is associated with high cereal diets. Their concentrations may be higher in rams than wethers and there is circumstantial evidence for differences between breeds. We have Investigated their concentration in ewe and ram lambs of three breeds: East Friesland, Oxford and Texel.

Ten lambs of each breed and sex, born in March, were fed to appetite twice daily a concentrate (barley 683 g/kg, crude protein 170 g/kg DM ME 12.1 MJ/kg D.M) with hay available ad libitum. Animals were slaughtered together, by conventional procedures, at 27 weeks of age (± 4 days) and the hind loin was removed and dissected. The subcutaneous fat was analysed for fatty acid composition by capillary gas-liquid chromatography on Chrompack CP Sil 88 and CP wax 57 CB.

Type
Manipulation of Composition and Quality of Animal Products
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1988 , March 1988 , pp. 62
Copyright
Copyright © The British Society of Animal Production 1988

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