a nonsignificant trendP > 0.05
Lysine supplementation (CP23 + AA and CP19 + AA) significantly increased protein efficiency compared with the unsupplemented groups (CP23 and CP19) ( P < 0.05), and CP19 + AA significantly increased protein retention compared with CP19 ( P < 0.05), with a nonsignificant trend for CP23 + AA compared with CP19 ( P > 0.05).