The case for pre-parturient selenium and iodine supplementation of ewes for improving lamb survival
Sabine Schmoelzl A B C and Fran Cowley B
+ Author Affiliations
- Author Affiliations
A CSIRO Agriculture, F.D. McMaster Laboratory, New England Highway, Armidale, NSW 2350, Australia.
B School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.
C Corresponding author. Email: sabine.schmoelzl@csiro.au
Animal Production Science 56(8) 1263-1274 https://doi.org/10.1071/AN15362
Submitted: 8 July 2015 Accepted: 6 October 2015 Published: 8 March 2016
Abstract
Lamb survival is an issue of high relevance to the Australian sheep industry, as lamb-survival rates have direct bearing on overall reproductive performance of the sheep, and also constitute a main concern from an animal welfare perspective (Mellor and Stafford 2004). Both genetic and management factors play an important role in this complex issue (Hinch and Brien 2014). Ewe nutrition is of particular relevance as the intrauterine growth conditions prepare the lamb for the crucial transition to life outside the uterus. Effects of body condition of the ewe during various stages of the pregnancy have been investigated in detail, yet much less is known about the critical role of micronutrient provision to the ewe. Although several risk factors for selenium (Se) and iodine (I) subclinical deficiencies exist for sheep on pasture in Australia, determining micronutrient status in sheep or pasture is not straightforward. Several studies have separately found effects of Se and I supplementation on lamb survival. Studies investigating the interaction of Se and I supplementation have been few but results have demonstrated an interaction between Se and I. With increased twinning rates as a result of increased selection of numbers of lambs weaned, nutritional demands during pregnancy across flocks are increasing, and effects of micronutrients on lamb health and survival have greater impact. New opportunities in nutritional research are encouraging new studies into the effects of Se and I supplementation on lamb survival.
Additional keywords: goitre, growth, lamb mortality, management, neonate, pregnancy, reproduction, sheep, thermoregulation, thyroid.
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