Reciprocal crosses of Koekoek and Sasso chickens were evaluated for growth performance, feed efficiency, carcass yield, mortality rate, and genetic components using 60 randomly selected 8-wk-cockerels (15 from each mating group) at Jimma University poultry farm. Data were measured for initial and final body weight, feed intake, daily weight gain, and feed conversion ratio. At the end of the study, following a 4-h fasting period, chickens were weighed, humanely slaughtered, and dressed. Carcass weight, dressing percentage and amount and percentage of abdominal fat were determined. Mortality was recorded. Genetic components were calculated. The collected data were analyzed using the General Linear Models (GLM) procedure of the Statistical Analysis System other than mortality rate and genetic components. Mortality rate and genetic components were analyzed using GLIMMIX Procedure of SAS version 9.4. The study revealed that the cross of Koekoek (cockerel) × Sasso (pullet) (KS) performed significantly (P < 0.05) better than...

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