Transient treatment of pregnant Merino ewes with modulators of cortisol biosynthesis coinciding with primary wool follicle initiation alters lifetime wool growth
M. L. McDowall A D , N. S. Watson-Haigh B , N. M. Edwards A , H. N. Kadarmideen B , G. S. Nattrass C , H. A. McGrice A C and P. I. Hynd A
+ Author Affiliations
- Author Affiliations
A School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia.
B Systems Genetics, Commonwealth Scientific and Industrial Research Organisation Livestock Industries, James Cook University, Townsville, Qld 4814, Australia.
C South Australian Research and Development Institute Livestock and Farming Systems, JS Davies Building, Roseworthy Campus, Roseworthy, SA 5371, Australia.
D Corresponding author. Email: melanie.mcdowall@adelaide.edu.au
Animal Production Science 53(10) 1101-1111 https://doi.org/10.1071/AN12193
Submitted: 5 July 2012 Accepted: 31 December 2012 Published: 16 April 2013
Abstract
The economically important characteristics of the adult fleece of Merino sheep, such as increases in clean fleece weight, fibre length, fibre diameter and crimp characteristics are determined during critical phases of fetal development of the skin and its appendages. Genetics plays a major role in the development of traits, but the maternal uterine environment could also influence development. Treatment of pregnant ewes with cortisol and its analogues has previously been shown to produce changes in wool follicle morphology. The aim of this study was to determine the effect of transient manipulation of maternal cortisol status during critical phases of wool follicle initiation and development in utero. From Days 55–65 post-conception, singleton-bearing Merino ewes were treated with metyrapone (cortisol inhibitor) or betamethasone (cortisol analogue). Lambs exposed to metyrapone in utero were born with hairier birthcoats than the control or betamethasone treatment groups (P < 0.05), displayed a 10% increase in staple length and a reduction in crimp frequency for the first three shearings (P < 0.05). Co-expression network analysis of microarray data revealed up-regulation of members of the transforming growth factor-β and chemokine receptor superfamilies, gene families known to influence hair and skin development. These experiments demonstrate that presumptive transient manipulation of maternal cortisol status coinciding with the initiation of fetal wool follicle development results in long-term alteration in fleece characteristics, namely fibre length and fibre crimp frequency. These results indicate it is possible to alter the lifetime wool production of Merino sheep with therapeutics targeted to gene expression during key windows of development in utero.
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