PMID: 9436255Jan 22, 1998Paper

Role of the uterus in early regression of corpora lutea induced by the ram effect in seasonally anoestrous Barbarine ewes

Reproduction, Nutrition, Development
N LassouedJ Thimonier

Abstract

The involvement of the uterus in early regression of corpora lutea induced by the ram effect was studied in seasonally anoestrous Barbarine ewes. In experiment 1, group I was only submitted to the male effect (control, n = 15) while group II (n = 14) was injected every 12 h with flunixin meglumine, a PGF2 alpha synthetase inhibitor (finadyne), from day 3 to day 6 (day 0: day of ram introduction). The preovulatory LH surge appeared at the same time (around 21 h after ram introduction) in both groups. Finadyne treatment significantly decreased 13-14-dihydro-15-keto-PGF2 alpha (PGFM) pulses (1.3 +/- 0.3 versus 0.4 +/- 0.2; P < 0.05), the number of short cycles (50 versus 14%, P < 0.05), and provided a single peak of oestrus, 15-16 days after the introduction of the rams, instead of between day 14 and day 23 (P < 0.01). In experiment 2, 17 hysterectomized ewes were allocated into two groups: group III (n = 8) was injected with oil and group IV (n = 9) received an intramuscular injection of 20 mg of progesterone immediately before introduction of rams. An additional group of intact ewes was used as control (group V, n = 9). Hysterectomy did not affect the ovulation response to the ram effect, but completely suppressed short cycles (...Continue Reading

Citations

Dec 21, 2013·Reproduction : the Official Journal of the Society for the Study of Fertility·H M BrownR J Scaramuzzi
Jul 27, 2014·Reproduction : the Official Journal of the Society for the Study of Fertility·Achraf AdibMaria-Teresa Pellicer-Rubio
May 10, 2008·Animal Reproduction Science·G deNicoloS T Morris
Oct 14, 2005·Domestic Animal Endocrinology·J A AbeciaJ A Valares
Jul 11, 2006·Reproduction, Nutrition, Development·Philippe ChemineauDanielle Monniaux
Feb 6, 2017·Tropical Animal Health and Production·Z Ben KhlilN Lassoued

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