Accessibility navigation


Seasonality of reproduction in sheep

Rosa, H. J. D. and Bryant, M. J. (2003) Seasonality of reproduction in sheep. Small Ruminant Research, 48 (3). pp. 155-171. ISSN 0921-4488

Full text not archived in this repository.

To link to this article DOI: 10.1016/s0921-4488(03)00038-5

Abstract/Summary

Unlike most domestic livestock species, sheep are widely known as an animal with marked seasonality of breeding activity. The annual cycle of daily photoperiod has been identified as the determinant factor of this phenomenon, while environmental temperature, nutritional status, social interactions, lambing date and lactation period are considered to modulate it. The aim of this paper is to review the current state of knowledge of the reproductive seasonality in sheep. Following general considerations concerning the importance of seasonal breeding as a reproductive strategy for the survival of species, the paper describes the manifestations of seasonality in both the ram and the ewe. Both determinant and modulating factors are developed and special emphasis is given to the neuroendocrine base of photoperiodic regulation of seasonal breeding. Other aspects such as the role of melatonin, the involvement of thyroid hormones and the concept of photorefractoriness are also reviewed. (C) 2003 Elsevier Science B.V. All rights reserved.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Agriculture, Policy and Development
ID Code:9114
Uncontrolled Keywords:sheep, reproduction, seasonality, photoperiod, melatonin, anoestrus, GONADOTROPIN-RELEASING-HORMONE, PLASMA PROLACTIN CONCENTRATIONS, NEGATIVE FEEDBACK ACTION, MELATONIN BINDING-SITES, PLACING, MICRO-IMPLANTS, OVINE PARS TUBERALIS, LUTEINIZING-HORMONE, BREEDING-SEASON, PHOTOPERIODIC CONTROL, ANESTROUS EWES

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation