This study was conducted to detect the effect of natural gastrointestinal parasitic infection along with age and level of energy on the carcass yield and characteristics of Sudan Desert sheep. Forty-eight lambs were divided into eight groups of 6 animals each and fattened for 60 days. A total of twenty four animals (3 from each group) were selected for slaughter at the end of the fattening process. The study revealed significant differences in slaughter weights (P < 0.05), carcass weights (P < 0.05) and carcass characteristics. Both hot and cold empty body weights and dressing percentages were significantly (P < 0.01) affected by internal parasitic infection and dietary energy level. Wholesale cuts yields and loin composition were not significantly affected by infection except for muscle percentage (P < 0.05).
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