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Prepubertal predictors for fertility in dairy cattle: potential use of metabolic hormones

  • C. Hayhurst (a1), A.P.F Flint (a2), P. Lovendahl (a3), J.A Woolliams (a4) and M.D. Royal (a1)...

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The length and severity of negative energy balance postpartum is unfavourably correlated (genetically & phenotypically) with interval to first ovulation (de Vries & Veerkamp, 2000). During this period concentrations of free fatty acids (FFA), glucose, growth hormone (GH), insulin, insulin like growth factor 1 (IGF-1) and other hormones, all of which have links with many aspects of reproduction, are altered. A moderate heritability and genetic correlation between these parameters in the female and male (who is ultimately of most use for selection purposes) calf with female fertility could allow juvenile selection for fertility. With this in mind the objective of this study was to estimate the heritability of FFA, glucose, GH, insulin and IGF-1 concentration in male and female calves.

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de Vries, M. J., and Veerkamp, R.F. 2000. Energy balance of dairy cattle in relation to milk production variable and fertility. Journal of Dairy Science 83: 62–69.
Frystyk, J., Dinesen, B. and Orskov, H. 1995. Non-competitive time-resolved immunoflourometric assays for determination of human insulin-like growth factor I and II. Growth Regulation 5: 169–176.
Løvendahl, P. and Purup, H.M. 2002. Technical note: time-resolved fluoro-immunometric assay for intact insulin in livestock species. Journal of Animal Science 80: 191–195.
Løvendahl, P., Adamsen, J., Lund, R. and Lind, P. 2003. Technical note: time-resolved immunofluorometric assay for growth hormone in ruminants. Journal of Animal Science 81: 1294–1299.

Prepubertal predictors for fertility in dairy cattle: potential use of metabolic hormones

  • C. Hayhurst (a1), A.P.F Flint (a2), P. Lovendahl (a3), J.A Woolliams (a4) and M.D. Royal (a1)...

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