Abstract : This experiment was conducted to assess the nutritional effect of Roselle seed, as a protein source, with or without enzyme (xylem 500) on the performance, carcass yields and blood serum constituents. One hundred and ninety six, seven day old unsexed Cobb broiler chicks, were subjected to a42- day experimental period. Chicks were divided into seven groups of 28 chicks each of 4 equal replicates and were randomly assigned to different experimental diets (A, B, C, D, E, F and H), The first group , fed the control diet (A), groups 2, 3, and 4 fed diets B,C and D containing 5., 10. and 15.% Roselle seeds respectively, however groups 5,6,and 7 fed diets E, F and H containing 5, 10, 15% Roselle seeds supplemented with enzyme respectively. Diets were formulated to meet the requirements of broiler chicks according to NRC (1994). The experimental diets were fed for 6 weeks. The evaluated parameters covered growth performance, slaughter and carcass values, serum metabolites, and electrolytes and economic efficiency.
Results showed no significant differences between the performance (weight gain, feed intake, feed conversion ratio and mortality rate) of chicks fed on diets containing various levels of Roselle seeds with or without enzyme.. Results also showed no significant differences due to inclusion of Roselle seeds or enzyme supplementation on dressing percent, carcass components, commercial cuts and meat quality.
Moreover ,the results show significant differences in serum cholesterol and level of AST activity between the control group and the other experimental groups .However ,no significant differences were detected between all groups in total protein, uric acid, Ca and ALT.
The economical efficiency proved that Roselle seeds could be included in broiler diets as plant protein source up to 15% when supplemented with enzyme (xylam 500).
A. Mukhtar. Mukhtar
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