The current study was aimed at evaluating growth performance of Black Australorp × indigenous naked neck Tswana chickens F1 crossbred progeny relative to purebred indigenous naked neck Tswana chickens under an intensive management system in Botswana. A total of 66 Australorp x Tswana crossbred chickens and 66 purebred indigenous Tswana chickens were housed in a deep litter house and evaluated for body weight every fortnight from 4-20 weeks of age. The chickens were provided with water and commercial feeds ad libitum. Males of both crossbred and purebred chickens were generally heavier (p<0.05) than their age-matched female counterparts at different ages. Body weight was significantly higher in Australorp x Tswana crossbred males than purebred males from 10 weeks (1139.48±31.26g vs. 1088.56±32.47g) to 20 weeks of age (2920.93±57.73g vs. 2467.26±59.97g). Crossbred females were significantly heavier than their purebred counterparts from 14 weeks (1528.66±41.13g vs. 1363.85±39.64g) to 20 weeks of age (2224.27 ±59.19g vs. 1839.31±57.04g). Crossbreeding can therefore be used as a strategy to improve growth performance of indigenous Tswana chickens raised under an intensive management system.