| 摘要 |
A rumen injector to inject a predetermined volume of medication into an animal, said injector having a body with a handle gripped by the user, a cylinder fixed to the body, a piston movably associated with the cylinder so as to define a variable volume space, a needle communicating with said space, and wherein said piston is movable to a cocked position where it is retained until automatically released upon said needle being inserted into the animal a predetermined distance. |
