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Effects of dietary methionine and lysine sources on nutrient digestion, nitrogen utilization, and duodenal amino acid flow in growing goats¹

Z. H. Sun^*,, Z. L. Tan^*,2, S. M. Liu, G. O. Tayo^*,, B. Lin^*, B. Teng^||, S. X. Tang^*, W. J. Wang^*, Y. P. Liao^||, Y. F. Pan^*, J. R. Wang^*, X. G. Zhao^* and Y. Hu^*

^* Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, China; and Graduate School of the Chinese Academy of Sciences, Beijing 100039, China; and Commonwealth Scientific and Industrial Research Organisation Livestock Industries, Floreat, WA 6014, Australia; and Babcock University, Ikeja Lagos 21244, Nigeria; and and ^|| Guangzhou Tanke Bio-Tech Industry Co. Ltd., Guangzhou 510520, China

² Corresponding author: zltan{at}isa.ac.cn

This study investigated the effects of supplementation of various sources of Met and Lys on nutrient digestion, N utilization, and duodenal AA flows in growing goats. Four 4-mo-old Liuyang Black wether goats were used in a 4 x 4 Latin square experiment and were assigned to 4 dietary treatments: (1) control, (2) control + lipid-coated Met-Zn chelate and Lys-Mn chelate (PML), (3) control + Met-Zn chelate and Lys-Mn chelate (CML), and (4) control + DL-Met, L-Lys-HCl, ZnSO₄·7H₂O, and MnSO₄·H₂O (FML). Compared with control, PML reduced (P < 0.05) ruminal NH₃ concentration, urinary N excretion, and plasma urea N concentration and increased (P < 0.05) the activity of ruminal endo-1,4-ß-D-glucanase and ß-glucosidase, the duodenal flow of N, N retention (g/d as well as % of absorbed N), the duodenal flows of Met, Lys, His, Val, and total essential AA, and plasma concentrations of Lys, Val, Phe, and total essential AA. Supplementing Zn-Met and Mn-Lys chelates had similar (P > 0.05) but lesser effects on these measures compared with PML, and the effects on most of the measures were not statistically significant (P > 0.05) when compared with control. Supplementing free-form Met and Lys had no effects compared with control (P > 0.05). The results indicate that lipid coating and chelating of AA provide a protection, and to a lesser extent by only chelating, of the AA from microbial degradation in the rumen and possibly has effects on rumen fermentation, which increases MP supply. This technology could improve productive performance and be of potential benefit to ruminant production if cost-effective products are developed.

Key Words: goat • rumen-protected amino acid • methionine • lysine • nitrogen balance • rumen fermentation