title: Effects of dietary methionine and lysine sources on nutrient digestion, nitrogen utilization, and duodenal amino acid flow in growing goats.
abstract: 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, ZnSO(4).7H(2)O, and MnSO(4).H(2)O (FML). Compared with control, PML reduced (P < 0.05) ruminal NH(3) 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, 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.
authors: Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, China.
authors: Z H
authors: ZH
authors: Sun
authors: Z L
authors: ZL
authors: Tan
authors: S M
authors: SM
authors: Liu
authors: G O
authors: GO
authors: Tayo
authors: B
authors: B
authors: Lin
authors: B
authors: B
authors: Teng
authors: S X
authors: SX
authors: Tang
authors: W J
authors: WJ
authors: Wang
authors: Y P
authors: YP
authors: Liao
authors: Y F
authors: YF
authors: Pan
authors: J R
authors: JR
authors: Wang
authors: X G
authors: XG
authors: Zhao
authors: Y
authors: Y
authors: Hu
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000378:metabolism; D000818:Animals; D001806:Blood Urea Nitrogen; D002614:Chelating Agents / Q000494:pharmacology*; D004044:Dietary Proteins / Q000378:metabolism / Q000494:pharmacology*; D004063:Digestion / Q000187:drug effects* / Q000502:physiology; D004386:Duodenum / Q000378:metabolism*; D005285:Fermentation; D006041:Goats / Q000254:growth & development / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism / Q000494:pharmacology; D008297:Male; D008715:Methionine / Q000378:metabolism / Q000494:pharmacology; D009584:Nitrogen / Q000378:metabolism*; D011897:Random Allocation; D012417:Rumen / Q000378:metabolism / Q000382:microbiology
chemical_list: D002614:Chelating Agents; D004044:Dietary Proteins; D000641:Ammonia; D008715:Methionine; D008239:Lysine; D009584:Nitrogen