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Effects of body condition at calving, post-partum nutrition and calf access on the interval from calving to first ovulation in beef cows: Ovarian folliculogenesis and gonadotrophin secretion

Published online by Cambridge University Press:  20 November 2017

M. G. Diskin
Affiliation:
Teagasc, Athenry, Co. Galway, Ireland
D. R. Mackey
Affiliation:
Teagasc, Athenry, Co. Galway, Ireland University College Dublin, Dublin 4, Ireland
A. Sanz
Affiliation:
Servicio de Investigacion Agraria, Unidad de Produccion Animal, Apdo. 727.50080, Zaragoza, Spain
L. Marongiu
Affiliation:
Istituto Zootecnico e Caseario per la Sardegna, Olmedo, Sardinia, Italy
G. Quintans
Affiliation:
Scottish Agricultural College, Aberdeen, UK AB21 9YA
J. F. Roche
Affiliation:
University College Dublin, Dublin 4, Ireland
R. Revilla
Affiliation:
Servicio de Investigacion Agraria, Unidad de Produccion Animal, Apdo. 727.50080, Zaragoza, Spain
A. Branca
Affiliation:
Istituto Zootecnico e Caseario per la Sardegna, Olmedo, Sardinia, Italy
K. D. Sinclair
Affiliation:
Scottish Agricultural College, Aberdeen, UK AB21 9YA
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Extract

The interval from calving to first ovulation is a major factor affecting reproductive and productive efficiency in beef cows. While this interval is affected by pre- and post-partum nutrition, the maternal-offspring bond is generally considered to be the major cause of delayed ovulation in beef cows. The endocrine and physiological mechanisms by which these factors either singularly or interactively control the duration of the post-partum anovulatory period are not well established, although they most likely involve the regulation of pulsatile LH release. The present study sought to examine the interactive effects of pre- and post-partum nutrition on LH secretion and follicle wave dynamics following acute calf isolation and once-a-day suckling (restricted access), after emergence of the fourth follicular wave post partum.

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Copyright
Copyright © The British Society of Animal Science 1999

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Effects of body condition at calving, post-partum nutrition and calf access on the interval from calving to first ovulation in beef cows: Ovarian folliculogenesis and gonadotrophin secretion
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Effects of body condition at calving, post-partum nutrition and calf access on the interval from calving to first ovulation in beef cows: Ovarian folliculogenesis and gonadotrophin secretion
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Effects of body condition at calving, post-partum nutrition and calf access on the interval from calving to first ovulation in beef cows: Ovarian folliculogenesis and gonadotrophin secretion
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