J. Anim Sci.
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Published online first on August 20, 2007
J. Anim Sci. 1990. doi:10.2527/jas.2006-718
© 2007 American Society of Animal Science
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J. Anim Sci., doi: 10.2527/jas.2006-718
©Copyright, 2007, The American Society of Animal Science

ARTICLE

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

Z. H. Sun 1, Z. L. Tan 2*, S. M. Liu 3, G. O. Tayo 4, B. Lin 2, B. Teng 5, S. X. Tang 2, W. J. Wang 2, Y. P. Liao 5, Y. F. Pan 2, J. R. Wang 2, X. G. Zhao 2, Y. Hu 2

1 Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Hunan 410125, People's Republic of China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, People's Republic of China
2 Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Hunan 410125, People's Republic of China
3 CSIRO Livestock Industries, Floreat, WA 6014, Australia
4 Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Hunan 410125, People's Republic of China; Babcock University, Ikeja Lagos 21244, Nigeria
5 Guangzhou Tanke Bio-Tech Industry Co. LTD, Guangzhou 510520, People's Republic of China

* To whom correspondence should be addressed. E-mail: zltan{at}isa.ac.cn.


  Abstract

This study investigated the effects of supplementation of various sources of methionine (Met) and lysine (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 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); (4) control + DL-Met, L-Lys-HCl, ZnSO4·7H2O and MnSO4·H2O (FML). Compared to control, PML reduced (P < 0.05) ruminal ammonia concentration, urinary N excretion, and plasma urea-N concentration, and increased (P < 0.05) the activity of ruminal endo-1,4-{beta}-D-glucanase and {beta}-glucosidase, the duodenal flow of N, N retention (g/d as well as % of absorbed N), the duodenal flows of Met, Lys, histidine (His), valine (Val) and total essential AA (TEAA), and plasma concentrations of Lys, Val, phenylalanine (Phe) and TEAA. Supplementing Zn-Met and Mn-Lys chelates had similar (P > 0.05) but lesser extents of effects on these measures when compared with PML, and the effects on the 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 to control (P > 0.05). The results indicate that lipid coating and chelating of AA provide a protection, to a lesser extent by 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 acids, methionine, lysine, nitrogen balance, rumen fermentation






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Copyright © 2007 by the American Society of Animal Science.