Reasons for the decline of laying performance of laying hens

1. High-quality feed: it requires comprehensive nutrition, good palatability, fresh and moldy, easy to digest, containing crude protein 21% Mui 23%, metabolic energy 3100-3200 kcal / kg.

2. Unstable feed quality: lack and excess of nutrients, substandard feed hygiene, poor palatability or high ash content can lead to the decrease of egg laying performance.

3. The qualified rate of bred chickens is too low: the qualified rate is the ratio of the number of qualified chickens (the body weight is less than ±10% of the standard body weight and the shank length is 104~106mm) to the number of chicks in the house. The low qualified rate of breeding indicates that there are more deaths in the breeding period, and the physique and evenness of the chickens are poor. Underweight or overweight will lead to the postponement or advance of egg laying, unstable peak laying period and low performance, and evenness is the main factor directly affecting the production performance of laying hens.

4. The precursor maturation and sexual maturity can not be synchronized: the body weight is lower than the standard when the normal laying weight is reached, or when the egg laying rate reaches 5%. The results are due to unreasonable feed nutrition, unreasonable lighting procedures, feed restrictions and diseases. If the formula can not be adjusted in time during brooding, breeding and climate change, the proportion of feed energy, protein, calcium and phosphorus is unreasonable, which affects the increase of body weight and sexual maturity. Light is one of the important environmental conditions for chicken production. The time and intensity of light play an important role in chicken activity, material metabolism, growth and development and productivity. Incorrect feed restriction can affect the development and maturity of the reproductive system. In the 6-8 weeks of the later stage of brooding, sudden feed restrictions will affect the normal physical development of chickens. Disease can also cause poor physique of chickens, affecting the normal development and maturity of chickens.

5. Unscientific feeding and management: unreasonable temperature control, insufficient light and drinking water, and extensive daily management will lead to the decrease of production performance. In addition, the invasion of disease and other stress are also the reasons for the low laying performance of chickens.