Assiri, Abdulwahab2022-05-182022-05-182018727https://drepo.sdl.edu.sa/handle/20.500.14154/3443Abstract: Local breeds have been adapted to the harsh environment, poor nutrition and diseases of chicken, which make them one of the most important concern of the researchers and specialists in the poultry community. Therefore, many studies in poultry have pointed out that there is a possibility to improve the growth and production of the local chicken by crossing them with the high producing commercial strains, and feeding them a suitable ration. As a step to improve local Saudi chicken, thisenThesis