The effect of reducing energy intake through feed intake restriction on the performance of weaned barrows when amino acid intake declines either in direct proportion to energy or at a reduced rate

Amino acid intake declined either in constant proportion to energy or at a reduced rate when feed intake treatments represented 100, 70, 60 or 50% of ad libitum. Amino acid intake affected feed conversion, and energy and lysine utilization (P < 0.05). Energy studies involving feed restriction may be confounded by amino acid supply.