Growth, carcass and meat characteristics of Karayaka growing rams fed sugar beet pulp, partially substituting for grass hay as forage

Abstract

Twenty-one growing male Karayaka sheep were divided into three groups of seven at 12 months of age. All groups received a commercial feed (60%) and roughage (40%). One group received grass hay as roughage (control, C), the other two groups received a mixture in which 40 (0.40SBP) or 60% (0.60SBP) sugar beet pulp (SBP) was used in partial replacement of grass hay in the C group during 56 days. Dry matter (DM) intake and DM conversion index (kg DM per kg weight gain) of the C group were higher ( P < 0.01) than that of the 0.40SBP and 0.60SBP groups. While the 0.60SBP increased ( P < 0.05) the L* of meat from the Karayaka young rams, the 0.40SBP or 0.60SBP decreased the ultimate pH ( P < 0.05) and cooking loss ( P < 0.01) compared to the C group. Means for redness ( a*), yellowness ( b*), Hue ( H*) and Chroma ( C*) and sensory characteristics indicated that there were no significant differences between dietary treatments. Inclusion of 60% SBP increased the palmitic ( P < 0.02) and linoleic ( P < 0.01) acid contents of the meat, it decreased ( P < 0.01) stearic, oleic and arachidonic acid contents compared to the C group. The 0.40SBP also increased ( P < 0.01) the linoleic acid content of the meat, but it decreased ( P < 0.01) stearic and arachidonic acid contents compared to the control. Although meat from young rams fed 0.60SBP diet had a higher value of lightness and linoleic acid, and a lower value of cooking loss than those from animals fed the C diet, sensory evaluation did not discriminate the meat from young rams fed with control and/or SBP diets. Therefore, grass hay can be replaced by 60% of SBP in the growing diet for Karayaka rams without a reduction in meat quality.