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Journal of Dairy Science Vol. 73 No. 10 2766-2773
© 1990 by American Dairy Science Association ®
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Influence of Breed of Fetus on Periparturient Endocrine Responses and Subsequent Milk Production of Ayrshire Dams

L. A. Guilbault 1, G. L. Roy 1, J. F. Beckers 2, and J. J. Dufour 3

1 Agriculture Canada Research Station, Lennoxville, Quebec, Canada J1M 1Z3
2 Department of Animal Reproduction, IRSIA Faculty of Veterinary Medicine, 1070 Brussels, Belgium
3 Department of Animal Science, Université Laval, Ste-Foy, Québec, Canada G1K 7P4

Purebred Ayrshire females were assigned to two groups based on the breed of fetus carried during gestation. In group 1, Limousin embryos were transferred nonsurgically into Ayrshire recipients (10 heifers and 1 cow), and in group 2, 11 Ayrshire heifers and 1 cow were inseminated artificially to Ayrshire bulls. Blood samples were collected daily from d 265 of gestation until d 15 postpartum from 5 heifers of each group. Milk yield was recorded on alternate weeks during the first 20 wk postpartum. Calf birth weight was higher (44.2 vs. 35.4 kg) and gestation was longer (297.4 vs. 280.2 d) in Ayrshire dams bearing Limousin fetuses than in those bearing Ayrshire fetuses. Daily milk production for the first 20 wk was lower (18.1 vs. 20.8 kg) in Ayrshire dams bearing Limousin fetuses than in those bearing Ayrshire fetuses. Prepartum decrease in progesterone concentrations and increase in estrone concentrations were faster in Ayrshire heifers bearing Limousin fetuses than in those bearing Ayrshire fetuses. Profiles of peripartum concentrations of bovine placental lactogen differed between Ayrshire dams carrying different families of Limousin fetuses but were similar in those carrying families of Ayrshire fetuses. The concentrations of 15-keto-13,14-dihydroprostaglandin F2alpha were lower during the postpartum period in heifers that gave birth to Limousin calves than in those that had Ayrshire calves. In conclusion, the breed of fetus influences physiological and endocrine responses of the dam, which might have some effect on milk production of the dam.

Key Words: fetal effects • milk production • endocrine responses

Submitted on September 18, 1989
Accepted on May 9, 1990






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Copyright © 1990 by the American Dairy Science Association ®.