Effect of Feeding Zaraibi male goats on rations containing different levels of corn steep liquor, as a source of protein on growth performance and carcass quality.

ABSTRACT
The objective of the present study was to explore the influence of partial replacement of concentrate feed mixture (CFM) with corn steep liquor (CSL), as a low cost protein source, on growth / fattening performance and carcass quality of goat Zaraibi males. CSL added at four levels; 0, 10, 20, and 30%, based on crude protein content of the CFM.
Twenty male goats of almost similar age (3 months), were divided into four equal groups, five kids each. Groups were assigned at random to receive the four experimental fattening rations, along 3 month experimental period. The control ration was consisted of CFM and rice strow (RS) without CSL (A) while tested rations B, C and D supplemented with 10, 20 and 30 % CSL on the expense of CP of CFM portion of the control ration, respectively.
Results showed that total body weight gain was significantly higher with 10% CSL replacement level compared to the other three groups. The differences among treatments respecting hot carcass weight were not significant, but the heaviest weight correspondto ration (B). Dressing percentage (based on fasting weight) of kids was the highest for group fed ration (B), but without significant difference than rations A and D.
Carcass cuts of group (B) was greater than the other groups (A), (C) and (D). Carcass composition of lean, fat and bone weights based on (9, 10, 11th ribs) did not significantly affected by the dietary treatments. The differences among the experimental tratments in respect of most offals and internal organs were not-significant.
Chemical composition of lean in 9, 10, 11th ribs showed that protein content was higher with all tested rations (B , C and D) compared with control (A) and the differences were significant only between the ration had the low level of CSL (B) and the control (A). The highest fat % recorded with B followed by A while the lowest value detected with the high level of CSL (D). On the other hand, the effect of the tested rations on ash and moisture percentages as well as PH and color were not-significant.