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Fertility of Friesian cows after insemination on the second, third and fourth days of low milk progesterone concentrations

Foulkes, J.A.; Goodey, R.G.

Veterinary Record 122(6): 135

1988

ISSN/ISBN: 0042-4900
PMID: 3369064
Document Number: 321451
176 postpartum cows in 19 herds were inseminated on the 2nd, 3rd or 4th day on which a low milk progesterone concentration was indicated by the use of a commercial analysis kit. The CR of cows inseminated on the 3 days was 20.2, 19.6 and 9.8% resp.; that for cows inseminated with Limousin, Hereford, Friesian and Charolais semen (provided by 1 bull per breed) was 11.0, 14.9, 23.7 and 20.0% resp. For 528 contemporary cows inseminated at observed oestrus in the same herds, the CR was 53%.

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