Animal Science Department, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil.
CJ do Brasil, Ind. Com. Prod. Alim. Ltda, São Paulo, Brazil.
J Anim Sci. 2019 Jan 1;97(1):269-278. doi: 10.1093/jas/sky394.
Supplementary l-lysine sources include l-lysine HCl and l-lysine sulfate. l-Lysine sulfate contains at least 50% l-Lys and other components as residues from the fermentation process, other amino acids, and other organic and inorganic substances, being an alternative to l-Lys HCl. The aim of this study was to evaluate the relative bioavailability (RBV) of l-Lys sulfate in comparison with l-Lys HCl and its effects on performance, blood parameters, intestinal functionality, and the apparent total tract digestibility in nursery piglets. A total of 168 female piglets (DB90 × PIC337), weaned at 22 d (BW = 6.29 ± 0.41 kg), were distributed in seven dietary treatments and eight replicates, with three pigs per pen. The experimental period of 42 d was divided into two phases (phase 1, days 0-21; phase 2, days 21 to 42). The basal diet (CON) was lysine-deficient formulated to meet 73% of standardized ileal digestible Lys requirements. For the other diets, the CON was supplemented with three levels (80%, 90%, and 100% of standardized ileal digestible Lys requirements) of l-Lys sulfate (70% l-Lys) or l-Lys HCl (79% l-Lys). There were no significant differences (P > 0.05) in the performance and concentrations of plasma urea and creatinine between the l-Lys sources. The RBV of l-Lys sulfate relative to l-Lys HCl was 106%, 119%, and 117% for effects on ADG, G:F, and plasma urea, respectively. Lys deficiency resulted in a greater (P < 0.05) incidence of diarrhea, while pigs supplemented with Lys sulfate or Lys HCl showed greater (P < 0.05) villus height in the jejunum when compared to those receiving the CON. Diets supplemented with l-Lys sulfate had greater (P < 0.05) apparent total tract digestibility of dry matter, gross energy, and crude protein. In conclusion, the RBV of l-Lys sulfate for effects on ADG, G:F, and plasma urea is equivalent to that of l-Lys HCl for nursery piglets.
补充 l-赖氨酸来源包括 l-赖氨酸盐酸盐和 l-赖氨酸硫酸盐。l-赖氨酸硫酸盐含有至少 50%的 l-赖氨酸和发酵过程中的其他成分作为残留物、其他氨基酸以及其他有机和无机物质，是 l-赖氨酸盐酸盐的替代品。本研究旨在评估 l-赖氨酸硫酸盐的相对生物利用率 (RBV) 与 l-赖氨酸盐酸盐的差异，以及其对生长猪生产性能、血液参数、肠道功能和表观全肠道消化率的影响。共有 168 头母猪（DB90× PIC337），22 日龄断奶（BW=6.29±0.41kg），随机分为 7 种饲粮处理，每个处理 8 个重复，每个重复 3 头猪。42 天的试验期分为两个阶段（阶段 1，0-21 天；阶段 2，21-42 天）。基础饲粮（CON）是赖氨酸缺乏的，旨在满足标准化回肠可消化赖氨酸需求的 73%。对于其他饲粮，CON 中添加了 3 个水平（标准化回肠可消化赖氨酸需求的 80%、90%和 100%）的 l-赖氨酸硫酸盐（70%的 l-赖氨酸）或 l-赖氨酸盐酸盐（79%的 l-赖氨酸）。l-赖氨酸来源对生产性能和血浆尿素、肌酐浓度无显著差异（P＞0.05）。l-赖氨酸硫酸盐相对于 l-赖氨酸盐酸盐对 ADG、G:F 和血浆尿素的 RBV 分别为 106%、119%和 117%。赖氨酸缺乏导致腹泻发生率更高（P＜0.05），而补充 l-赖氨酸硫酸盐或 l-赖氨酸盐酸盐的猪空肠绒毛高度更高（P＜0.05）。补充 l-赖氨酸硫酸盐的饲粮对干物质、总能和粗蛋白的表观全肠道消化率更高（P＜0.05）。综上所述，对于生长猪，l-赖氨酸硫酸盐的 RBV 在 ADG、G:F 和血浆尿素方面与 l-赖氨酸盐酸盐相当。
