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Effect of selection for glucose tolerance in sheep on carcass fat and plasma glucose, urea and insulin

Published online by Cambridge University Press:  27 March 2009

S. M. Francis ,
R. Bickerstaffe ,
J. N. Clarke ,
D. O'Connell  and
A. P. Hurford
S. M. Francis
Affiliation:
Ministry of Agriculture & Fisheries, Canterbury Agriculture & Science Centre, Lincoln, Canterbury, New Zealand
R. Bickerstaffe
Affiliation:
Department of Biochemistry and Microbiology, Lincoln University, Canterbury, New Zealand
J. N. Clarke
Affiliation:
AgResearch, Ruakura Agricultural Centre, Private Bag, Hamilton, New Zealand
D. O'Connell
Affiliation:
AgResearch, Canterbury Agriculture & Science Centre, PO Box 60, Lincoln, Canterbury, New Zealand
A. P. Hurford
Affiliation:
AgResearch, Ruakura Agricultural Centre, Private Bag, Hamilton, New Zealand
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Summary

Over 5 years (1987–91), the progeny of rams selected for fast (Low T-half) or slow (High T-half) glucose clearance after an intravenous glucose tolerance test, differed significantly in glucose tolerance. In comparison with an unselected control, the line differences were mainly in the direction of Low T-half. They appear to have arisen during the establishment period, with little evidence of enhanced divergence over the four subsequent years of continued selection (heritability 0·10±0·03). The Low line had higher plasma insulin concentrations during the glucose tolerance test than the High line. Basal plasma concentrations of glucose were lower, and urea higher in the Low than the High line. In addition, carcasses of Low line ram progeny had more subcutaneous fat at the same carcass weight than High line carcasses (11% higher GR in the final year of the experiment). Selection of sheep for glucose clearance appeared to be associated with differential partitioning of nutrients into adipose tissue, the pooled genetic correlation between T-half and GR being −0·28±0·13.

Type
Animals
Information
The Journal of Agricultural Science , Volume 123 , Issue 2 , October 1994 , pp. 279 - 286
Copyright
Copyright © Cambridge University Press 1994

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