It is well known that chickens, like other birds, naturally moult once a year before winter approaches. The damaged old feathers fall off and new feathers grow back. This process is called moulting. Moulting of chickens is a natural physiological phenomenon, and it is also the adaptability of nature to chickens in the process of evolution. Because there is no rich plumage, it is difficult to withstand the long and cold invasion. Natural moult usually occurs in the fall, early in the late summer and early autumn, late in the early winter, moulting and endocrine related, due to decreased ovarian function, and the female hormone secretion is not correct. The result was atrophy of the follicles. At the same time, the thyroid hormone secreted by the thyroid that promotes the growth of feathers during moulting increases, hormone secretion is unbalanced, and induction of production and moulting is induced. Natural moulting time for chickens is long, about 4 months. Moulting requires the consumption of many nutrients to form new feathers. Therefore, chickens often stop production during moulting. In general, high-yield chickens have late feather changes, feathers fall off and new feathers grow faster; while low-yielding chickens have early molting, feather shedding, and new feathers grow slowly. Today's high-producing laying hens have a high egg production rate. If the chickens are renewed after one year of production, the rearing chickens need to spend a lot of labor, use a lot of feed, and other expenditures are also increased. In particular, in recent years, many high-yielding breeder chickens have been imported from various parts of the country. The cost is very high. It takes only one year to replace it, and it is economically uneconomical. According to the law of nature, the hens must be moulted once in the fall, and there are large individual differences in the morning and evening of the moult. Some hens moult, and some hens still lay eggs. This has caused a lot of inconvenience in selecting a reasonable breeding level, lighting, etc. The egg production rate of such chickens is not high and the quality of the eggs is also poor. Therefore, the artificial forced moulting technology for chickens came into being. The so-called artificial forced moulting is artificially exerting some stress factors on chickens. Under the action of stress factors, the special morphological and functional changes of organs and systems that occur in chickens are over, mainly because eggs are temporarily stopped. Weight loss, feather shedding, and replacement of new feathers. The purpose of forced moulting is to stop the chickens in the short term, moult, rest, and then restore egg production, improve the quality of the eggs, and achieve the purpose of extending the economic use period of chickens. The basic theoretical basis for manual forced moulting is that the most effective way to make complex tissue is to rebuild tissue from a completely degraded, nonfunctional state. Artificial forced moulting is to degrade the chicken's ovary to a non-functional state, eliminate the fat in the uterine tubular cells, and on this basis promote the recovery of reproductive function with good conditions, and thus obtain an ideal second laying cycle. In the case of ensuring that the mortality rate does not exceed the standard, maximum weightlessness is created as much as possible, resulting in strong stress and re-establishing the chicken's reproductive organs in a highly degraded state, thereby obtaining satisfactory results. China Agricultural Network Editor
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