Method for placing implant in udder

A method of inserting an implant into the milk cistern of an udder of an animal having an udder and teat attached thereto with a dispensing instrument containing an implant, said teat having a teat duct with a normally closed discharge opening, said teat duct having an upper end open to the cistern, said instrument having an elongated tubular member having a chamber with a longitudinal axis for accommodating the implant and a forward section with an open exit end, a piston located in the chamber, and means for moving the piston along the longitudinal axis of the chamber toward the exit end of the chamber to move the implant from the chamber through the exit end, said instrument and implant located in the chamber being stored in an envelope, said envelope having sheet members with outer peripheral end and side portions thereof releasably secured together comprising:

• opening the envelope by separating the end portion and side portions of the sheet members to provide access to the tubular member of the dispensing instrument, inserting the forward section of the tubular member of the dispensing instrument into the teat duct through the discharge opening thereof to position the tubular member in the teat duct with the exit end adjacent the upper end of the milk duct, using the envelope as a cover during the insertion of the tubular member into the milk duct, moving the implant from the chamber of the tubular member into the cistern of the udder while retaining the tubular member in the teat duct by moving the piston along the longitudinal axis of the chamber relative to the tubular member toward the exit end, and removing the tubular member from the teat duct.