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Stress reactivity and its relationship to beef quality in Nguni steers supplemented with Acacia karroo leaves

Published online by Cambridge University Press:  18 March 2011

C. Mapiye ,
M. Chimonyo ,
M. C. Marufu  and
V. Muchenje
C. Mapiye*
Affiliation:
Department of Livestock and Pasture Science, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
M. Chimonyo
Affiliation:
Discipline of Animal and Poultry Science, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
M. C. Marufu
Affiliation:
Discipline of Animal and Poultry Science, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
V. Muchenje
Affiliation:
Department of Livestock and Pasture Science, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
*
†E-mail: [email protected]
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Abstract

The objective of this study was to determine the levels of catecholamines and their relationship to beef quality in Nguni steers fed on Acacia karroo leaves. A total of 30 19-month-old steers were randomly assigned to A. karroo leaves (AK), sunflower cake (SF) and the control with no supplement (CN) diets. The AK and SF diets provided the steers with an additional 150 g of protein per day for 60 days. Catecholamine levels were determined from urine samples collected from each steer before and after slaughter. The Musculus longissimus thoracis et lumborum was sampled for selected meat quality measurements. Nguni steers on the CN diet had higher (P < 0.05) concentrations of post-mortem urinary norepinephrine and dopamine compared with those that received the AK and SF diets. Norepinephrine was negatively linearly related (P < 0.05) to the Warner–Bratzler shear force value of meat aged for 21 days and cooking loss of meat aged for 2 days (CL2) in steers that were given the SF diet. Meat pH and drip loss values were inversely related (P < 0.05) to epinephrine concentration in steers that received the AK diet. Dopamine concentration was negatively linearly related (P < 0.05) to water holding capacity and CL2 for steers on the CN diet. For steers on the CN diet, lightness (L*) values increased (P < 0.05) with increase in dopamine concentration. It was concluded that stress responsiveness and its relationship to certain beef quality attributes could be positively manipulated by supplementation with A. karroo leaves.

Keywords

dopamineepinephrinemeat pHnorepinephrinepre-slaughter stress
Type
Full Paper
Information
animal , Volume 5 , Issue 9 , 05 August 2011 , pp. 1361 - 1369
Copyright
Copyright © The Animal Consortium 2011

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