A group of ducks in the breeding process, due to feeding and individual differences and other factors, often 10-20% of the ducks produce less eggs or no eggs, in order to reduce the cost of feeding, increase duck production rate. It can be judged from the following characteristics during the production of eggs to gradually eliminate low-yielding ducks. First, the breeding period of more than three years; Second, molting early, long time, and more times; Third, cloacal tight small, more wrinkles and dry; Fourth, the head large neck short, short and narrow mouth, and the tip flat, up Square convex is not obvious; Fifth, the abdomen is small and hard, the pubic end can only accommodate 2.5 fingers, high-yield ducks can accommodate 3 - 4.5 refers to; 6, chest back narrow, rough feathers, fluffy and dull; The body is short, the base of the wings and the heel of the wings are only 3 to 3.5 fingers apart, and the high-yielding ducks are generally more than 4 fingers apart; 8. The body is overweight, greedy and lazy, and lazy ducks; Keep moving up and down, high-yield ducks have straight legs and do not swing; Ten, sick and disabled ducks. Such as limping, producing malformed eggs, habitual production of soft shell eggs, poor lean body of sick ducks. China Agricultural Network Editor
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