Genetic (co) variation of growth hormone (GH), insulin like growth factor 1 (IGF-1) and insulin in pre-pubertal Holstein-Friesian heifers (1298 d; se; n=496) and the correlation with interval to commencement of luteal activity postpartum (CLA) was estimated using ASREML software. GH showed no additive genetic variation whereas IGF-1 and insulin were heritable (0.290.15; 0.240.14). IGF-1 was negatively genetically correlated to CLA suggesting that genetically calves with higher than average IGF-1 tend to have a shorter CLA. IGF-1 may be of interest to dairy cattle selection programmes to improve female fertility providing the high heritability estimate in the present study is confirmed in males, and the trait is shown to be correlated genetically to high reproductive efficiency in subsequent lactations.

C. Hayhurst, A. PF Flint, P. Lovendahl, John A Woolliams, M. D Royal

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.18, 2006
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