Institute of Animal Science Academy of Agricultural Sciences Laboratory of Animal Nutrition and Feed Science(South China)of Ministry of Agriculture Key Laboratory of Livestock and Poultry Breeding Public Laboratory of Animal Breeding and Nutrition Key Laboratory of Animal Breeding and Nutrition;
Institute of Life Science and Engineering University;
Adisseo France S.A.S.Centre of Excellence and Research in Nutrition;
DL-METHIONINE; 2-Hydroxy-4 methyl(thio)butanoic acid; Productive performance; Efficacy; Laying duck;