Effect of South African beef production systems on post-mortem muscle energy status and meat quality |
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Authors: | L. Frylinck P.E. Strydom E.C. Webb E. du Toit |
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Affiliation: | 1. Animal Production Institute, Agricultural Research Council of South Africa, Private Bag X2, Irene 0062, South Africa;2. Department of Animal & Wildlife Sciences, University of Pretoria, Pretoria 0002, South Africa |
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Abstract: | Post-slaughter muscle energy metabolism meat colour of South African production systems were compared; steers (n = 182) of Nguni, Simmental Brahman crossbreds were reared on pasture until A-, AB-, or B-age, in feedlot until A–AB-age. After exsanguination carcasses were electrically stimulated (400 V for 15 s). M. longissimus dorsi muscle energy samples were taken at 1, 2, 4 and 20 h. Post-mortem samples for meat quality studies were taken at 1, 7 and 14 days post-mortem. Production systems affected muscle glycogen, glucose, glucose-6-P, lactic acid, ATP, creatine-P glycolytic potential (P < 0.05), with the muscles of feedlot carcasses having a faster glycolysis rate than pasture carcasses. Energy metabolites correlated (0.4 < r < 0.9) with meat colour (CIE, L*a*b*), (0.3 < r > 0.5) water holding capacity, drip loss, and Warner Bratzler shear force. Muscle energy only affected muscle contraction of the A-age-pasture system (shortest sarcomere length of 1.66 μm vs 1.75 μm highest WBS of 6 kg vs 5 kg 7 days post-mortem). |
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Keywords: | Beef production system Energy metabolism Meat colour Sarcomere length Tenderness |
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