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Effect of acute nutritional restriction on periovulatory oestradiol and IGF-I in beef heifers

Published online by Cambridge University Press:  20 November 2017

D.R. Mackey ,
A.R.G. Wylie ,
J.F. Roche ,
J.M. Sreenan  and
M.G. Diskin
D.R. Mackey
Affiliation:
Teagasc Research Centre, Athenry, Co. Galway, Ireland Faculty of Veterinary Medicine, University College Dublin, Dublin 4, Ireland
A.R.G. Wylie
Affiliation:
Department of Agriculture and Rural Development, and Queen’s University, Newforge Lane, Belfast BT9 5PX
J.F. Roche
Affiliation:
Faculty of Veterinary Medicine, University College Dublin, Dublin 4, Ireland
J.M. Sreenan
Affiliation:
Teagasc Research Centre, Athenry, Co. Galway, Ireland
M.G. Diskin
Affiliation:
Teagasc Research Centre, Athenry, Co. Galway, Ireland
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Extract

Severe negative energy balance (NEB) in the postpartum period of dairy cows may be associated with declining fertility but the mechanisms by which nutrition influences reproduction are complex, poorly understood and confounded by lactation. Hence, both chronic and acute nutritional restriction of beef heifers have been used as models to examine the effects of NEB on ovarian and endocrine responses in the absence of lactation. Plasma IGF-I concentrations gradually decreased until the onset of anoestrus (Stagg et al., 1999) but concentrations may be confounded with stage of the oestrous cycle, especially around ovulation (Mackey et al., 2000). Therefore, the aim of this study was to examine the effect of nutritional restriction on periovulatory oestradiol (E2) and IGF-I concentrations.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 215
Copyright
Copyright © The British Society of Animal Science 2001

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References

Mackey, D.R., Wylie, A.R.G., Sreenan, J.M., Roche, J.F. and Diskin, M.G. (2000). The effect of acute nutritional change on follicle wave turnover, gonadotropin, and steroid concentration in beef heifers. J. Anim. Sci. 78: 429–442.Google Scholar
Stagg, K. (1999), PhD Thesis, University College Dublin, Ireland.Google Scholar