What is the role of chemical raw materials of tetraene estrone? Who has it?

Estrone (Estrone) is mainly used for sows in pig farms to estrus at a predetermined time, which is convenient for pig farms to manage sows in batches. Allyl gesterone is a relatively new product in China except that it is made by CEVA SANTE ANIMALE S.A, and Xi Anvio Bio is a raw material for export. Please ask questions.