The experiment was conducted to determine the causative factors of poor fertility, hatchability, and their rectification in RIR breeds of chicken in Ethiopia. For crossing chickens were randomly allotted as RIR( )xRIR( ), RIR( )xWL( ), WL( )xRIR( ), and WL( )xWL( ). Each group was inseminated with equal number of spermatozoa on weekly basis. Pure RIR showed lower fertility and crossing of RIR with...