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Studies on plasma progesterone concentrations and fertility in Friesland dairy cows during the post-partum period

Published online by Cambridge University Press:  27 March 2009

D. H. Holness
Affiliation:
Henderson Research Station, Department of Research and Specialist Services, Private Bag 222 A, Salisbury, Zimbabwe
G. W. Sprowson
Affiliation:
Henderson Research Station, Department of Research and Specialist Services, Private Bag 222 A, Salisbury, Zimbabwe
Carole Sheward
Affiliation:
Henderson Research Station, Department of Research and Specialist Services, Private Bag 222 A, Salisbury, Zimbabwe
Amanda Geel
Affiliation:
Henderson Research Station, Department of Research and Specialist Services, Private Bag 222 A, Salisbury, Zimbabwe

Summary

Plasma progesterone concentrations were monitored in 69 lactating Friesland dairy cows during the post-partum period. Cyclic ovarian activity resumed in most cows within 40 days of calving. Forty-eight per cent of cows remained pregnant to their first insemination, 41% returned to oestrus before day 30 after insemination, and a further 11% returned to oestrus between days 30 and 88 after insemination.

The mean of progesterone values on days 11 to 4 before insemination tended to be higher in cows that conceived than in cows that did not conceive. These differences were signficant on day –8 (P <0·05) and on days –8, –7, –6 and –5 combined (P <0·01). Cows in which the concentration of progesterone in plasma did not rise above 4·5 ng/ml during this period did not conceive. After insemination, mean progesterone concentrations between pregnant and non-pregnant cows diverged after day +8. Relatively low concentrations of plasma progesterone (< 1 ng/ml) up to day +8 after insemination did not preclude conception. There was no indication that embryo loss between days +30 and +88 after insemination was related to an insufficiency of ovarian progesterone during early pregnancy.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1981

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