Evaluation of growth performance of broiler birds fed with diet containing different levels of velvet bean meal as an alternative protein ingredient

Abstract

The effect of replacement of soybean meal (SBM) by the velvet bean meal (VBM) as an alternative protein ingredient on the growth performance of broiler birds was investigated. The seed materials of velvet bean (VB) [ Mucuna pruriens (L.) DC. var. utilis (Wall. ex Wight) Baker ex Burck], an under-utilized food legume collected from South India, was found to contain appreciable levels of proteins (265 g/kg DM); lipid (65.1 g/kg DM); Neutral Detergent Fiber (84.3 g/kg DM) and ash content (49.2 g/kg DM). Soaking in sodium-bi-carbonate solution + autoclaving treatment was found to cause substantial reduction on the levels of antinutritional compounds such as tannins (75%), L-Dopa (81%), phytic acid (70%), raffinose (92%), stachyose (89%), verbascose (71%), haemagglutinating activity (75%), trypsin inhibitor activity (78%) and α-amylase inhibitor activity (77%) without affecting the nutritional quality of VB seeds. Such processed VBM was incorporated as an alternative protein source by replacing the SBM protein at 0, 20, 40, 60, 80 and 100% levels in the commercial type broiler diets. Replacement of SBM up to 40% level with VBM as an alternative protein ingredient in the poultry diet, which corresponds to the inclusion of VBM up to 15.7% in the starter feed and 11% in the finisher phase poultry feed, exhibited better growth performance of the broiler birds without any adverse effects.