METHODS	Male Cobb 500 broiler chickens were divided into 4 body weight-matched groups and received a control diet with normal cholecalciferol ( 2760 IU/kg feed ) for 42 d , a diet with high concentrations of cholecalciferol ( 5520 IU/kg feed ) for 42 d , or a diet with 25 ( OH ) D ( 5520 IU/kg feed ) for 42 d ( HyD-42 ) .\