选取体重为250 g左右的Wistar大鼠20只，按性别、体重随机分为A、B 2个处理组。A组饲喂豆粕日粮（常规蛋白水平），B组饲喂添加包膜赖氨酸的日粮（低蛋白水平），正试期3 d，于第4天清晨饲喂前空腹和饲喂后的不同时间点采血，分离血清，测定血清游离赖氨酸浓度。结果表明，饲喂添加包膜赖氨酸日粮的大鼠和饲喂豆粕日粮的大鼠，二者的赖氨酸吸收曲线具有同步性，采食后4h的吸收曲线一致性很强，4 h之后饲喂添加包膜赖氨酸日粮的大鼠血清中的赖氨酸浓度下降略快。提示饲粮中添加包膜赖氨酸可代替部分豆粕赖氨酸，降低豆粕使用量。%A total of 20 Wistar rats with body weight of about 250 g were chosen and randomly divided into 2 groups, A and B, based on gender and weight. The group A fed soybean meal feed (routine protein level), and the group B fed diet adding with crystalline lysine (low protein level). The formal experiment lasted for 3 d. On the 4th day morning, the blood samples were collected from the rats in different time points before and after ingestion, and were used to determine the serum free lysine contents. The results showed that the lysine absorption curve of the rats in group A and group B exhibited obvious synchronism, especially within 4 h after ingestion. After 4 h of ingestion, the decrease of serum free lysine contents of rats fed diet adding with crystalline lysine was more rapid. It was indicated that the adding of crystalline lysine in diet could partially substitute for lysine provide by soybean meal, and the amount of soybean meal could be reduced.
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