The Influence of Feed Protein-Energy Level on the Growth and Slaughter Performance for „Arbor Acres” Hybrid

In this paper was studied the influence of feed energy-protein level on the growth performance (average daily gain, feed conversion), slaughtering efficiency and participation of the trenched parts in the whole carcasses structure at „ARBOR ACRES” hybrid slaughtered at 42 days old. The two groups (control group-Lc, experimental group Lexp.) were given feed mixed with different level of energy and protein (Lc-standard hybrid, Lexp.-higher by 10% compared to standard hybrid). In the growth period for each group were made weighings at: 1, 7, 14, 21, 35 and 42 days. After slaughter, from each group were sampled 30 carcasses (15 females and 15 males) for determined the slaughter efficacy on fresh and refrigerated carcasses. At the end of the growing period, at Lexp. group average body weight was 2481.93g, with 3.88% more than average values recorded at control group. For average daily gain, Lexp. group had higher values compared with the control group, the situation is reversed when has been referring to the feed conversion rate. The fresh carcasses at slaughtering efficiency had values for males from 80.27% (Lexp.) to 79.36% (Lc) and for females from 78.57% (Lexp.) to 78.18% (Lc). After 24 hours of refrigeration, these values were reduced by 1.78 up to 1.88%. For participation of the trenched parts in the whole carcass structure (breast, wings, thighs and shanks), at Lexp. group were registered the highest values, and for the control group the lowest values for these parts and the highest values for the other parts (head, neck, back and legs), with differences between females and males. For Lexp. group, which received feed with high protein-energy level, average values for feed conversion rate (FCR) were lower and for other studied indicators were higher as compared with control group.