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individuals within a specie/breed is common practice among the native chickensof Nigeria in the Guinea savanna. Oluyemi (1979) advocated the development of new strains of the indigenous chicken by crossing between indigenous ecotypes as a means of improving the productivity of the local. Thus, it is common knowledge that outcrossing results in heterosis in the offspring. Sheridan (1980) referred to heterosis as the superiority of a crossbred (outcrossed) animal over the average performance of its parents. Sheridan (1981) further explained that heterosis is any favourbale departure from additivity in crossbred populations. Fairfull (1990) treated heterosis as the deviation of the crossbred progeny above the mean performance of their two parents.However, several authors have reported the occurrence of negative heterosis; a situation where the performance of the offspring is below that of the parental mean. Mekki et al.

Heterosis for hatch weight and body weight gain in outcrossed native chickens of Nigeria under savanna conditions