Mushi D.E., Safari J., Mtenga L.A., Kifaro G.C., Eik L.O.
Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5025, N-1432 Ås, Norway; Department of Life Sciences, Mkwawa University College of Education, Private Bag, Iringa, Tanzania; Department of Animal Science and Production, Sokoine University of Agriculture, P.O Box 3004, Morogoro, Tanzania; Institute of Rural Development and Planning, P O Box 138, Dodoma, Tanzania
Mushi, D.E., Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5025, N-1432 Ås, Norway, Department of Life Sciences, Mkwawa University College of Education, Private Bag, Iringa, Tanzania; Safari, J., Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5025, N-1432 Ås, Norway, Institute of Rural Development and Planning, P O Box 138, Dodoma, Tanzania; Mtenga, L.A., Department of Animal Science and Production, Sokoine University of Agriculture, P.O Box 3004, Morogoro, Tanzania; Kifaro, G.C., Department of Animal Science and Production, Sokoine University of Agriculture, P.O Box 3004, Morogoro, Tanzania; Eik, L.O., Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5025, N-1432 Ås, Norway
To assess the effects of finishing Small East African × Norwegian crossbred goats with concentrate diets on the fattening performance, carcass and meat quality, 32 castrated crossbred goats (9.5 months old, 17.1 kg BWT) were equally allocated into four levels of concentrate supplementation. The concentrate levels were: Zero access to concentrate (T0), 33% access to ad libitum concentrate allowance (T33), 66% access to ad libitum concentrate allowance (T66) and 100% access to ad libitum concentrate allowance (T100). Each animal had access to ad libitum grass hay. Ad libitum concentrate intake for the goats was 663 g/d, which supported ME intake of 8.7 MJ/head/d. The attained maximum daily gain was 96 g/d. T100 and T66 goats were comparable in slaughter weight but the former had 2 kg heavier (P < 0.05) carcasses than the latter. T100 and T66 goats were similar in carcass fatness scores, though both were fattier (P < 0.05) than other diet groups. Dressing percentage (DP) was expressed in three different ways. In all but commercial DP, T100 were comparable to T66 goats, but all were higher than the other diet groups. For T0 goats, pH-values remained above 6 even after 24 h post-mortem. Cooking losses increased (P < 0.05) with increasing levels of concentrate supplementation. Moreover, among the muscles assessed, M. rectus abdominis had the least cooking loss. Warner-Bratzler shear force values of cooked muscles were highest (P < 0.05) in M. gluteobiceps, followed by M. vastus lateralis, while M. psoas major and longismus dorsi aged for 6 days had the least values. Finishing Small East African × Norwegian crossbred goats at 66% access to their ad libitum concentrate intake gives optimum carcass and meat quality, and that any increase above this level seems not to improve meat production. © 2008 Elsevier B.V. All rights reserved.