Characteristics of carcass and non-carcass components of lambs finished with different levels of waste from soybean pre-cleaning as a fibrous feedstuff

The objective of this study was to assess the effect of varying levels of sorghum silage replacement with waste from soybean pre -cleaning (WSPC) on the characteristics of carcass and non -carcass components in feedlot -finished lambs. A total of 32 uncastrated, weaned, Texel x Ile de France crossbreed male lambs, at 60 days of age, were used. The treatments consisted of different levels of WSPC replacing roughage (sorghum silage) at 0, 33.5, 66.5, and 100% on a dry matter (DM) basis. For these replacement levels, the inclusion of WSPC in the ration was 0, 150, 300, and 450 g kg -1 DM. A roughage -to -concentrate ratio of 45:55, also on a DM basis, was applied. The roughage component consisted of sorghum silage and/or WSPC, while the concentrate contained corn grits, soybean meal, and calcitic limestone. The lambs were slaughtered upon reaching a live weight of 35 kg. The study found no significant differences (P>0.05) in carcass traits across the different levels of WSPC replacement. Among non -carcass components, however, the proportions of liver, pancreas, thymus, and kidneys increased linearly (P <= 0.05) with increasing WSPC in the diet. Regarding the filling of the gastrointestinal tract, the content of the rumen, reticulum, small intestine, and total gastrointestinal content decreased linearly (P <= 0.05) with greater WSPC in the diet. Waste from soybean pre -cleaning can replace sorghum silage as roughage in feedlot lamb diets without affecting the characteristics of carcass and noncarcass components. A replacement level of up to 100% (inclusion of 450 g kg -1 DM of the ration) is recommended for diets with a roughage -to -concentrate ratio of 45:55.