Eight hundred and sixty-four and 720 broilers, 50% of each sex, from 22 to 42 and from 43 to 53 days of age, respectively, were used to determine the available phosphorus requirement for male and female broilers in the growing and finishing phases. Six supplementary levels of available phosphorus were added to available phosphorus deficient basal diets. The levels of available phosphorus added in (.0, .09, .18, .27, .36 and .45%) for the growing and (.0, .07, .14, .21, .28 and .35%) for finishing phases. Body weigth gain, feed intake, feed: gain ratio, ashes and phosphorus in the bone and bone fracture resistance were evaluated from 22 to 42 and from 43 to 53 days of age. It was suggested that available phosphorus requirements for the growing phase (22 - 42 days of age) are .442% or .142% of available phosphorus/Mcal of ME and .454% or .146% of available phosphorus/Mcal of ME, and finishing phase (43 - 53 days of age) are .310% or .098% of phosphorus/Mcal of ME and .240% or .076% of phosphorus/Mcal of ME, for males and females, respectively.
ash in the bone; available phophorus; bone fracture resistance; broilers; requirement
