Relationship between changes in core body temperature in lambs and post-slaughter muscle glycogen content and dark-cuttingD. G. Pighin A D G , W. Brown B , D. M. Ferguson E , A. D. Fisher F and R. D. Warner C
A Instituto Tecnología de Alimentos, Instituto Nacional de Tecnología Agropecuaria – INTA, De Los Reseros y Las Cabañas, Morón, Argentina.
B Department of Primary Industries, 600 Sneydes Road, Werribee, Vic. 3030, Australia.
C CSIRO Animal, Food and Health Sciences, 671 Sneydes Road, Werribee, Vic. 3030, Australia.
D Consejo Nacional de Investigaciones Científica y Técnicas – CONICET, Av. Rivadavia 1917, Buenos Aires, Argentina.
E Livestock Welfare, CSIRO Livestock Industries, Locked Bag 1, Armidale, NSW 2350, Australia.
F Faculty of Veterinary Science and Animal Welfare Science Centre, The University of Melbourne, Werribee, Vic. 3030, Australia.
G Corresponding author. Email: email@example.com
Animal Production Science 54(4) 459-463 https://doi.org/10.1071/AN12379
Submitted: 2 November 2012 Accepted: 7 March 2013 Published: 21 May 2013
Pre-slaughter stress may decrease muscle glycogen content, a key element for a suitable low ultimate pH and prevention of dark-cutting meat. Body temperature monitoring is a tool used in research on animal stress, as an indicator of stress events. Possible relationships between body temperature of sheep and post-mortem muscle glycogen were investigated in this study. Body temperature was measured with intravaginal loggers inserted into each animal at 3 days pre-slaughter, to record body temperature every 3 min over a period of 3 days. Blood samples were collected from each animal at exsanguination for measurement of glucose and lactic acid concentrations. The muscle content of glycogen and lactic acid were determined in samples of M. longissimus collected at the level of the 13th rib, at 1 h post-slaughter. A plot of body temperature versus time showed a rise in body temperature from all animals during events such as mustering, loading onto the truck, unloading at the abattoir, during pre-slaughter handling and at slaughter. Pearson’s correlation coefficients were determined between (1) the main temperature increments occurring between farm and slaughter; and (2) post-slaughter muscle glycogen and lactate levels. A significant negative correlation was detected between elevation in core body temperature due to physical stress of sheep and muscle glycogen levels at slaughter. A low correlation was detected between body temperature and blood glucose or lactate concentrations. Further research should examine the relationship between core body temperature and meat quality in order to better understand the complex relationship between animal stress and meat quality.
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