Fifty Awassi lambs, offsprings of nine sires, were used in this study to estimate genetic and phenotypic correlation of plasma insulin levels (INS) at early age (7 weeks) with each of birth weight (BW), weaning weight (WW), slaughter weight (SW) and daily gain from birth to weaning (G,) and 
from weaning to slaughter (G2). Prediction equations for (WW) and (SW) 
From insulin levels were derived. Genetic and phenotypic correlations between insulin levels and each of (BW), (WW), (SW), (G,) and (G2) were 
0 499, 0.438; 0.593, 0.428; 0.558, 0.388; 0.398, 0.226 and 0.655, 0.142, respectively. Heritability of insulin levels was 0.2. It appears that plasma insulin levels at early age could be used as a predictor of subsequent growth, and that selection for high Insulin levels may be effective for improving growth rate.

S. N Al-Raheem, D. A Aziz, A. A Aziz, J. E Alkass

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 378–381, 1990
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