Milk progesterone in postpartum and pregnant cows as a monitor of reproductive status

Journal of Dairy Science
J J SchiavoR H Foote

Abstract

Milk samples were analyzed for progesterone content by a petroleum ehter extraction and competitive protein binding assay validated for milk. In one experiment, 11 cows were sampled twice daily for 24 days beginning with an observed estrus 15 to 45 days postpartum, and again 19, 21, 23, and 25 days after breeding. Progesterone values during the estrous cycle paralleled those for blood plasma but were slightly higher at estrus (1.49 ng/ml milk) and maximum (9 ng/ml) on days 11 to 16 of the estrous cycle. After breeding, cows later diagnosed pregnant averaged 7.12 ng/ml while those later found to be nonpregnant averaged 2.36 ng/ml. All diagnoses of pregnancy were correct. In a separate experiment there was no difference between milk from front and rear quarters, but progesterone was highest in last milk, intermediate in composite milk, and lowest in first milk.

References

Aug 1, 1975·Biology of Reproduction·P W ConcannonW J Visek
Jun 1, 1974·Proceedings of the Society for Experimental Biology and Medicine·O J GintherW J Tyler
Jan 24, 1970·Nature·C A SlotinJ L Linzell
Feb 1, 1968·Journal of Reproduction and Fertility·M ShemeshH R Lindner

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Citations

Aug 1, 1986·New Zealand Veterinary Journal·K MollerR M Marchant
Jan 1, 1979·Journal of Dairy Science·G S HeckmanR A Marshall
Feb 1, 1981·Journal of Dairy Science·J A PenningtonJ R Lodge
Oct 1, 1982·Journal of Dairy Science·J A PenningtonJ R Lodge
Nov 1, 1978·Journal of Dairy Science·N M CoxD H Culver
Apr 1, 1979·Journal of Dairy Science·C M Cowan, L L Larson
Aug 1, 1978·Journal of Dairy Science·R D Bremel, M I Gangwer
Nov 19, 2013·Animal : an International Journal of Animal Bioscience·R von LeesenG Thaller
Jul 1, 1982·Zentralblatt für Veterinärmedizin. Reihe B. Journal of veterinary medicine. Series B·O FayemiB Gustafsson
Aug 1, 1976·Journal of Dairy Science·J A PenningtonJ R Lodge
Jun 2, 1980·Life Sciences·O Koldovsky

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