Research Progress on Genetic Mechanism of Hornless Character in Goats
In wild conditions,there is no horn variation in goats.Unlike other cattle animals,the horn character of goats is closely related to the intersexual character,which is called PIS(Polled Intersex Syndrome).A large number of studies have found that the PIS region is closely related to the hornless intersexual traits in goats.Goat intersexuality is a serious reproductive disorder,and it mostly occurs in hornless goats,which brings great obstacles to the breeding of hornless goats and the development of the industry of hornless goats.Therefore,revealing the genetic mechanism of goat horn-free intersexual traits is very important for the industry of horn-free goat.In this paper,the research methods,genetic mechanism and identification methods of the hornless intersexual traits of several varieties of goat were summarized in order to provide theoretical support for elucidating the genetic mechanism of the hornless traits and reference for the breeding of the goat.
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