| 摘要 |
<p>Disclosed are stable chemosterilant compositions useful in the control of pest populations comprising an orally active progestogenic compound of formula (I), wherein R1 is selected from the group consisting of OR2, OH and F, and R2 is carbacyl of 1 to 18 carbon atoms, and a paraffin wax. The compositions are palatable to roden species and also cause temporary or permanent sterility in the rodents. Preferred compositions contain 16α-ethyl-21-hydroxy-δ4,9-19-norpregnadiene-3,20-dione in amounts ranging from 0.4 to 20 milligrams per kilogram of composition. A method of controlling the number of animal pest species in an area involves distributing the described compositions in the area. Animals eating the pests are not effected by the described progestogens, thereby causing fewer problems with the food chain.</p> |
