The influence of selection for rapid (Fast GC) or slow (Slow GC) clearance of exogenous glucose on the pH of lamb meat was investigated using preslaughter stress, adrenaline and energy supplement treatments. Ultimate pH values were elevated (P<0.001) by a high level of preslaughter stress in the Fast GC line only. This response was suppressed by an oral energy supplement, indicating that recharge of muscle glycogen stores was impaired. The demonstration of this genetic relationship makes the selection lines valuable for study of the influence on meat quality of post mortem energy metabolism in muscles.
Proceedings of the New Zealand Society of Animal Production, Volume 52, , 13-16, 1992
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