An experiment was carried out on weaner pigs (initial BW 10.8 kg) to estimate the maintenance requirement for lysine (Lys) and its marginal efficiency of utilisation using a comparative slaughter technique. Three groups of six pigs each were fed purified diets for 21 days supplying Lys at 19.5, 78 or 195 mg/kg W0.75, which corresponded to 50, 200 or 500% of the assumed maintenance requirement. All other essential amino acids were given at 50% excess. At the end of the experiment, pigs were killed for whole-body nitrogen (N) and amino acid analysis. A representative group of six pigs was analysed at the beginning of the experiment. Based on regression equations, relating Lys or N retention to Lys intake, Lys requirement for zero Lys retention was estimated to be 121 mg/kg W0.75, while Lys requirement corresponding to zero N retention was 41.7 mg/kg W0.75. At N equilibrium, the pigs lost 65 mg of Lys per kg W0.75 daily while at zero Lys retention, the daily N retention was 156 mg/kg W0.75. The marginal efficiency of lysine utilisation was 0.91. It is concluded that zero lysine retention is a better criterion of lysine maintenance requirement than zero N retention.

中文翻译：

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通过比较屠宰技术估计的仔猪赖氨酸维持需求及其利用效率

对断奶仔猪（初始体重 10.8 kg）进行了一项实验，以使用比较屠宰技术估算赖氨酸 (Lys) 的维持需求及其边际利用效率。三组每组六头猪喂食纯化日粮 21 天，提供 19.5、78 或 195 mg/kg W0.75 的赖氨酸，这相当于假定维持需求的 50%、200% 或 500%。所有其他必需氨基酸均以 50% 过量的方式给予。实验结束时，宰杀猪进行全身氮 (N) 和氨基酸分析。在实验开始时分析了一组有代表性的六头猪。根据回归方程，将 Lys 或 N 保留与 Lys 摄入量联系起来，零 Lys 保留的 Lys 需求估计为 121 mg/kg W0.75，而对应于零 N 保留的 Lys 需求为 41。7 毫克/公斤 W0.75。在氮平衡时，猪每天每公斤 W0.75 损失 65 毫克赖氨酸，而在赖氨酸保留为零时，每日氮保留为 156 毫克/公斤 W0.75。赖氨酸利用的边际效率为 0.91。得出的结论是，零赖氨酸保留是比零 N 保留更好的赖氨酸维持要求标准。