PMID: 2712766Feb 1, 1989Paper

The effects of duration and concentration of plasma progesterone on the fertility of post-partum cows treated with pregnant mare serum gonadotrophin and intravaginal progesterone

Australian Veterinary Journal
R K Munro

Abstract

The effects of duration of insertion of progesterone releasing devices (PRIDs) on the concentrations of plasma progesterone (plasma P4) and the relationship of these with fertility were examined respectively in ovariectomised and intact Bos taurus cattle. In experiment 1, ovariectomised cows (n = 14) were treated with PRIDs to produce high and low plasma P4 for 7 or 14 days giving 4 treatment groups designated H7, H14, L7 or L14. Mean plasma P4 in the H14 and L14 groups were 6.6 and 6.0 ng/ml respectively, during the first week and 5.4 and 3.8 ng/ml respectively, during the second. Mean plasma P4 of 6.3 and 4.2 ng/ml were observed in H7 and L7. In experiment 2, suckled cows (n = 171) received the same PRID treatments as cows in experiment 1, plus either 375 or 750 iu pregnant mare serum gonadotrophin, and subsequent calving rates were recorded. These were significantly lower after L7 than the other treatments (12% v 38%, P less than 0.025). These results showed that fertility after oestrus was closely related to plasma P4 observed before oestrus and indicated that treatment with progesterone for as little as 1 week can produce normal fertility providing plasma P4 attain a critical threshold during treatment.

Citations

Sep 2, 1998·Journal of Controlled Release : Official Journal of the Controlled Release Society·M J RathboneC R Bunt
Jun 6, 2000·Advanced Drug Delivery Reviews·B u r g g r a a f ShaneM J Rathbone
May 6, 2003·Reproduction, Fertility, and Development·F M RhodesG A Verkerk
Aug 4, 2005·Experimental Brain Research·Cathy M StinearStephan P Swinnen
Jan 6, 2007·Scandinavian Journal of Occupational Therapy·A Birgitta GunnarssonMona Eklund
Oct 13, 2010·Journal of Psychopharmacology·H R SumnallJ C Cole
Dec 22, 1999·The Annals of Otology, Rhinology, and Laryngology·C T SasakiA Czibulka
Feb 11, 2003·The Journal of Veterinary Medical Science·Victor Chisha ZuluYutaka Sawamukai

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