At present, there are a large number of brown shell laying hens throughout the country. Some chicken farms rearing this type of chicken species report that chickens sometimes suffer from whitening, lightening, or pigmented patches of egg shells, accompanied by problems with poor eggshell quality. The following is a summary of the reasons for such problems.
1. Germplasm factors White-shelled laying hens and brown-shelled laying hens were crossed, and their offspring broilers showed a middle shell color. Modern chicken breeds are all hybrids of strains. Due to the differences in breeding materials used by breeding companies, or in the breeder farms that did not produce hybrids as required, the results showed that some shell chickens had uneven shell color.
2. Fallopian tube lesions According to investigation and analysis, the vast majority of brown shell eggshell lightening and disease occurred in chickens. The diseases most seriously endangered include chicken Newcastle disease, egg-reducing syndrome, transmission, chicken and bird flu. Due to serious violation of the reproductive system, in addition to causing a sharp decline in egg production, eggshell thinning, shell-free eggs increased, accompanied by eggshell fade fade, whitening and other typical clinical symptoms. It has been demonstrated that these diseases have reproductive system lesions. In the reproductive system, lesions occur, and the ovaries cannot function normally. In particular, the secretion of cells in the fallopian tube epithelium is abnormal. Even if the ovary can ovulate, it is difficult to form a normal egg structure. In addition, there are data reports that diseases related to the respiratory system can also affect brown egg color and eggshell strength.
3. The use of drugs It has been reported that taking nicarbazin anticoccidial can interfere with the synthesis of these pigments, resulting in normal production of brown shell egg breeds. Chicken egg laying period prevention or treatment of common or contagious drugs, such as sulfonamides, olaquindox, anticoccidial drugs or anthelmintic drugs, the use of time or the amount of inappropriate, but also have an adverse effect on the formation of eggs. For example, levamisole is not allowed to be deterred during the open period and peak period, and long-term sulfa drugs should not be fed.
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