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Material and Methods The growth, feed conversion and carcass characteristics of four commercial broiler lines commonly used in South Africa (A, B, C and D) were evaluated under identical commercial conditions. Line A was an intermediate maturing animal bred for growth at low altitudes whilst line B (intermediate maturing) was bred for higher altitudes. Line C is a chicken line selected for early maturing within the 42 d cycle whilst line D is late maturing. The broilers and feed consumption were weighed every week. Mortalities were recorded daily. Feed conversion (g feed per body mass FCR) was calculated after adding the cumulated mortality weights for each pen to the total bird mass of that pen. At the end of the trial (day 42), ten birds (5 male and 5 female) from each line were randomly removed and slaughtered using standard abattoir procedures. The breast and thigh + drumstick (includes skin and bone) from each bird was then analysed for chemical composition using standard laboratory techniques. Data was analysed using standard statistical procedures (SAS, 1989).

The chemical body composition of four South African commercial broiler strains