Effects of exogenous protease and phytase (PP) and direct-fed microbial (DFM) on nitrogen retention (NR) coefficient and nitrogen-corrected apparent metabolizable energy (AMEn)†.

a,bLeast square means in the same column without a common superscript differ significantly, P≤0.05.n = 8 samples per treatment for interactions and 16 samples per treatment group for main effects.1Formulated to meet breeder requirements for 14–21 d old broiler chicks except with a reduction of 0.94 MJ/kg of ME.†Determined in broiler chickens at 21 days of age in Experiment 1.