The laying rate at the age of 68 weeks of 3 breeds, ( Shaoxing duck, Khaki-Campbell duck and Gaoyou duck), were fitted by Wood Model.

• 用认七od模型拟合了绍兴鸭、卡基一康贝尔鸭和高邮鸭3个品种68周龄的产蛋率资料，3个品种鸭拟合的留值(拟合度)分别为:0.；6098、0