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Will treatment with progesterone, either alone or with oestradiol result in behavioural oestrus and a normal length luteal phase in postpartum beef suckler cows induced to ovulate by calf isolation and once-a-day suckling?

Published online by Cambridge University Press:  05 November 2021

D.R. Mackey ,
M.G. Diskin ,
J.M. Sreenan  and
J.F. Roche
D.R. Mackey
Affiliation:
Teagasc, Belclare Research Centre, Tuam, Co. Galway, Ireland University College Dublin, Dublin 4, Ireland
M.G. Diskin
Affiliation:
Teagasc, Belclare Research Centre, Tuam, Co. Galway, Ireland
J.M. Sreenan
Affiliation:
Teagasc, Belclare Research Centre, Tuam, Co. Galway, Ireland
J.F. Roche
Affiliation:
University College Dublin, Dublin 4, Ireland
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Extract

In beef suckler cows, the prolonged interval from calving to first ovulation (post-partum interval, PPI) is due to failure of ovulation of dominant follicles. It appears that a combination of poor body condition, maternal calf-bond and suckling act to suppress the LH pulse frequency necessary for ovulation. A combination of calf isolation and once-a-day suckling can significantly shorten the PPI, but the first ovulation generally occurs without overt oestrus and the subsequent cycle is short (8 to 11 days) due to lack of progesterone priming. The aim of this study was to examine the effects of progesterone or progesterone and oestradiol in conjunction with calf isolation on the interval to first ovulation, incidence of overt oestrus at first ovulation and length of the subsequent interovulatory interval.

Type
Programme
Information
Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 36
Copyright
Copyright © British Society of Animal Science 1997

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