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Encapsulated Methionine Supplement for Growing-Finishing Lambs¹

University of Guelph, Guelph, Ontario

Abstract

Two growth experiments and one metabolism experiment were conducted to determine the effect of supplementation with encapsulated methionine in lamb fattening rations. Encapsulated methionine (0.45% of ration) had no effect on gains and feed efficiency when a basal corn-alfalfa ration was supplemented with soybean meal. However, when the basal ration was supplemented with corn-urea or corn-blood meal-feather meal, encapsulated methionine increased gains by 11% and feed efficiency by 9% (P<.05). Methionine tended to increase excess carcass fat with the soybean meal supplements and to have the opposite effect on carcass composition with the non-soybean meal supplements. In a second feedlot study, in which the basal ration was supplemented with urea, 0.4% encapsulated methionine increased gains by 12% and feed efficiency by 10%. However, a marked reduction in performance was produced by the 0.6% level, indicating a toxic effect. In a metabolism trial, nitrogen digestibility, nitrogen retention and energy digestibility tended to increase with supplementation of encapsulated methionine.

¹ Financial assistance was provided by Delmar Chemicals Ltd., Montreal, and the Ontario Department of Agriculture and Food.

² Department of Animal and Poultry Science.

³ Present address: Ontario Department of Agriculture and Food, Stratford, Ontario.