The modern selection criteria focus on the main economic traits, and there are different selection criteria for different specialized strains, such as meat ducks and ducks, and the focus of their selection is completely different. In the matching line of meat ducks, the requirements for paternity and maternity are also different.
body weight. Weight is an important economic trait for meat ducks. Meat ducks require a certain amount of adult weight and are more focused on early growth rates. The heritability of body weight and growth rate is relatively high, and it is effective through individual selection and family selection. Weight, sexual maturation and feed consumption are related, body weight is generally mature late, feed consumption is more; lighter weight is given to early production and less material consumption.
Feed conversion ratio. It refers to how much meat and egg products can be obtained after consumption of several feeds, also known as feed compensation and feed conversion ratio. Since feed costs account for about 70% of the total cost of ducks, feed remuneration is an important economic trait. The traits of the feed conversion ratio can be inherited, and there are often significant differences between strains and individuals, and feed remuneration can be increased through seed selection. There are two ways to increase feed remuneration. One is to increase the production of ducks or increase the rate of weight gain. The second is to reduce feed consumption and improve the ability of feed to be converted into products.
Viability. It is usually expressed in terms of survival rate or mortality. This is the duck's ability to adapt to adverse conditions, and it is also an important condition that directly relates to economic benefits. The duck viability study also needs to add a 7-year-old duck survival rate. The heritability of viability is low, so individual choice is ineffective and family selection must be used.
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