A new perspective on managing the onset of puberty and early reproductive performance in ewe lambs: a review
C. A. Rosales Nieto A B C D G , A. N. Thompson A B E and G. B. Martin C F H
+ Author Affiliations
- Author Affiliations
A CRC for Sheep Industry Innovation and the University of New England, Armidale, NSW 2351, Australia.
B Department of Primary Industries and Rural Development, Western Australia, South Perth, WA 6151, Australia.
C UWA Institute of Agriculture, University of Western Australia, Crawley, WA 6009, Australia.
D Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Campo Experimental San Luis, 78431, México.
E School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.
F School of Agriculture and Environment, University of Western Australia, Crawley, WA 6009, Australia.
G Present address: Department of Animal Science, College of Agriculture and Natural Resources, Michigan State University, East Lansing, Michigan, USA.
H Corresponding author. Email: graeme.martin@uwa.edu.au
Animal Production Science 58(11) 1967-1975 https://doi.org/10.1071/AN17787
Submitted: 9 November 2017 Accepted: 12 January 2018 Published: 12 April 2018
Abstract
Global changes in industry and society have led us to reassess the numerous factors that combine to influence the time of onset of puberty and the efficiency of reproduction in young sheep. Age and weight have long been considered the dominant factors that influence the onset of puberty and, for many years, it has been accepted that these relationships are mediated by the hormone, leptin, produced by body fat. However, recent studies showing that muscle mass also plays a role have challenged this dogma and also presented new options for our understanding of metabolic inputs into the brain control of reproduction. Moreover, the possibility that an improvement in meat production will simultaneously advance puberty is exciting from an industry perspective. An industry goal of strong reproductive performance in the first year of life is becoming possible and, with it, a major step upwards in the lifetime reproductive performance of ewes. The concept of early puberty is not well accepted by producers for a variety of reasons, but the new data show clear industry benefits, so the next challenge is to change that perception and encourage producers to manage young ewes so they produce their first lamb at 1 year of age.
Additional keywords: ewe lambs, fertility, puberty, reproductive performance.
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