The study involved Salem Black kids at the age of three month and randomly dividing them into four treatment group (n=6). The first group fed with roughage as negative control and second group fed with roughage and concentrate as positive control. In third and fourth groups fifty and hundred per cent concentrate mixture replaced by wet brewer’s spent grain. Experimental diets were formulated as isonitrogenous and is caloric diet based on the ICAR (2013) guidelines. At the end of the 6th month of age on slaughter of kids, there was no significant difference in the mean preslaughter weight and mean dressing weight among the treatment groups. The mean empty carcass weight and empty carcass per cent also did not vary among the treatment groups. The mean dressing percentage of the kids in the T4 group was significantly (p< 0.05) higher than that of the kids in the T1 group and it was similar between T2 and T3 groups. The mean loin eye area in the kids of the T3 and T4 groups was significantly (p<0.05) higher than the T1 group. The per cent of total inedible parts was significantly (p<0.05) least in the kids supplemented with WBSG (100%) as compared to the kids in the T1 group. However, the percentage of whole sale cuts, neck and shoulder, breast and fore shank, rack, loin, legs, fore saddle and hind saddle were not influenced by the supplementation of concentrate or the WBSG in the Salem Black kids. The mean values of longissimus muscle fatty acids did not vary among the treatment groups; however, the C16:0 level was significantly (p<0.05) lower in the T4 compared to other groups. The supplementation of neither concentrate nor WBSG to kids had any significant influence on the n6/n3 ratio and PUFA values in the muscle. The mean PUFA/SFA ratio was significantly (p<0.05) higher in the T4 group as compared to all other treatment groups. Likewise, the longissimus muscle fatty acids C18:1(oleic acid), C18:2 (linoleic acid), MUFA, PUFA, PUFA: SFA were significantly increased and C16:0 (palmitic), C18:0 (stearic acid) and SFA were significantly decreased in the T4 group kids as compared to the control. Feeding of WBSG with roughage caused higher dressing percentage with lesser content of inedible parts. LCFA contents of the muscle were increased in kids with increase in MUFA and PUFA along with a decrease of SFA content which are beneficial to the consumer health.