1. Reserve chickens are not well-cultivated, and growth and development are hindered. Especially after 12 weeks of age, the body weight does not reach the breed standard, and the weight uniformity of the chicken population is not good.
2. If the feed is not changed in time after being transferred into the egg house or the egg production rate reaches 5%, the pre-production material is still used, but the peak material is not replaced in time.
3, feed quality is not good, such as cotton aphid, rapeseed and other miscellaneous anthraquinone content is too much; adulteration of feed ingredients, especially fish meal, soybean meal, amino acids and other protein raw materials adulteration; feed formula is unreasonable, limiting amino acid deficiency or amino acid ratio Improper; vitamins are low or even ineffective.
4. The laying hens have poor climate in summer and the weather is hot, and the chickens have insufficient feed intake.
5. During the brooding or breeding period, there were diseases, especially transmission.
6. The birds are in a sub-health state or atypical Newcastle disease.
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