Resumption of gonadotrophin release during the post-partum period in suckling and non-suckling ewes

Journal of Reproduction and Fertility
A SchirarJ Martinet

Abstract

The post-partum secretion of LH, FSH and prolactin was monitored in 15 suckling and 6 non-suckling Préalpes du Sud ewes lambing during the breeding season by measuring plasma hormone concentrations daily at 6-h intervals and also weekly at 20-min intervals for 6 h from parturition to resumption of regular cyclic ovarian activity. There was a constant phenomenon in the resumption of normal patterns of FSH and LH secretion: there was a rise in FSH values culminating on average on Day 4 post partum and returning subsequently to values observed during the oestrous cycle, and concurrently an increase in the frequency and amplitude of LH pulses more progressive in suckling than in non-suckling ewes which led to an elevation of LH mean concentrations and occurrence of an LH surge. Since neither the FSH secretory pattern nor FSH mean values differed between suckling and non-suckling ewes, the results suggested that LH pulsatile pattern was a major limiting factor for the resumption of normal oestrous cycles. Before regular oestrous cycles resumed other changes in preovulatory LH surges also occurred: (i) they increased in duration and probably in amplitude; (ii) they were preceded by an acceleration in LH pulse frequency and a large de...Continue Reading

Citations

Mar 29, 2000·Theriogenology·M Rodríguez-PiñónE G Garófalo
Feb 1, 2003·Animal Reproduction Science·L M MitchellJ J Robinson
Oct 12, 2011·The Journal of Reproduction and Development·Mohamed M M KandielKazuyoshi Taya
Nov 24, 2011·Hormones and Behavior·Cipatli García-Dalmán, Gabriela González-Mariscal
Dec 18, 2013·Seminars in Pediatric Surgery·James Grijalva, Khashayar Vakili
Oct 30, 2016·Domestic Animal Endocrinology·E MarciniakT Misztal
Jul 28, 2016·Journal of Animal Physiology and Animal Nutrition·S Rastle-SimpsonM Knights

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