| 摘要 |
A nutrient or medicinal composition for administration to ruminants, which includes a core of one or more biologically active substances coated with a film of polyurethane, overcoated with an "intermediate" wax is disclosed. This polyurethane/wax coating is resistant to rumen conditions, but will release the biologically active substance (s) in the abomasum and subsequent digestive tract of the ruminant animal. |
