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Selection for muscling increases adipose tissue response to adrenaline
Conference paper   Open access   Peer reviewed

Selection for muscling increases adipose tissue response to adrenaline

G.E. Gardner, K.M. Martin, D.W. Pethick, M.B. Ferguson, J.M. Thompson and P. McGilchrist
EAAP Scientific Series, Vol.127(1), pp.195-196
Wageningen Academic Publishers
3rd EAAP International Symposium on Energy and Protein Metabolism and Nutrition (Parma, Italy, 06/09/2010–10/09/2010)
2010
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Abstract

Carcass lean meat yield is a key profit driver within the sheep and beef industries, and is improved by selection for muscling. This trait can be improved through visual selection or with the use of estimated breeding values for yearling eye muscle depth (YEMD) in sheep, and retail beef yield in cattle. The resulting muscle hypertrophy impacts upon carcass composition, proportionately increasing muscle and decreasing subcutaneous fat (Perry et al., 1993; Hegarty et al. , 2006). At a physiological level the mechanisms under-pinning these compositional differences are unclear, with a number of key hormonal axis likely to be impacted. The key regulatory stress hormone adrenaline, which causes mobilisation of adipose triacylglycerol releasing non-esterified fatty acids (NEFA) for energy production could have a large effect. However, Gilson et al., (1986) indicated that NEFA response to adrenaline would simply reflect whole body fatness, and therefore its responsiveness is likely to be less in sheep and cattle selected for muscling. Thus, there is no known physiological shift which alters the catabolic mechanism in adipose of high muscled animals causing their reduced phenotypic leanness. In this study we test the hypothesis that adipose response to adrenaline will reflect whole body fatness in sheep and cattle selected for muscling.

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