1. Northwest A&F University, College of animal science and technology, Xinong Road No.22, Yangling, Shaanxi, Yangling, Shaanxi, China, 712100;
2. China Animal Husbandry Group, Building 18, Block 8, 188 West Road, South 4th Ring Road, Beijng, China, 100070;
3. Beijing Golden Star Duck Co. Ltd., No. 7, Deyu Street, Demaozhuang, Daxing District, Beijing, Beijing, China, 100163;
4. Northwest Agriculture and Forestry University, 12469, College of animal science and technology, xinong road, Yangling, Shaanxi, China, 712100;
5. Northwest Agriculture and Forestry University, 12469, College of animal science and technology, Xinong Road No.22, Yangling, Shaanxi, Yangling, Shaanxi, China, 712100;