Melengestrol

**Semantic type:** Organic Chemical|Pharmacologic Substance

**Definition:** A progestogen-like compound used as a cattle feed additive for its growth promoting effects and suppression of estrus (heat) in heifers. Critics have claimed that hormones used as growth promotants in cattle may cause breast cancer. (NCI)

**Synonyms:** - 17-hydroxy-6-methyl-16-methylenepregna-4,6-diene-3,20-dione - MELENGESTROL - MGA - Melengesterol - Melengestrel