A portable self-contained battery operated apparatus for administering injections to animals, comprising: a. a trigger controlled motorized hand-piece detachably connected to a processor module, the processor module comprising a memory configured to store instructions and at least one processor configured to execute the instructions; b. a pump housed in the processor module; c. a display within the processor module; d. a vial removably attached to the processor module and remote from the trigger controlled motorized hand-piece; e. a needle and a needle insertion control motor housed within the trigger controlled motorized hand-piece; f. a disposable tubing for fluid communication between the trigger controlled motorized hand-piece and the processor module; g. a hand-piece connection cable disposed between the trigger controlled motorized hand-piece and the processor module; h. a laser alignment system housed in the trigger controlled motorized hand-piece; i. an electronic control system for actively controlling injections, the electronic control system comprising a control software being executable by the processor module; j. a management system for managing information related to the injections, the management system comprising a management software being executable by the processor module; k. a safety function device disposed at a distal end of the trigger controlled motorized hand-piece, the safety function device being configured to ensure that a contact with an injection target is established before an injection cycle can be activated; and l. a coded tag reader disposed on the trigger controlled motorized hand-piece for reading a coded tag associated with an animal subject to injection. a. a trigger controlled motorized hand-piece detachably connected to a processor module, the processor module comprising a memory configured to store instructions and at least one processor configured to execute the instructions; b. a pump housed in the processor module; c. a display within the processor module; d. a vial removably attached to the processor module and remote from the trigger controlled motorized hand-piece; e. a needle and a needle insertion control motor housed within the trigger controlled motorized hand-piece; f. a disposable tubing for fluid communication between the trigger controlled motorized hand-piece and the processor module; g. a hand-piece connection cable disposed between the trigger controlled motorized hand-piece and the processor module; h. a laser alignment system housed in the trigger controlled motorized hand-piece; i. an electronic control system for actively controlling injections, the electronic control system comprising a control software being executable by the processor module; j. a management system for managing information related to the injections, the management system comprising a management software being executable by the processor module; k. a safety function device disposed at a distal end of the trigger controlled motorized hand-piece, the safety function device being configured to ensure that a contact with an injection target is established before an injection cycle can be activated; and l. a coded tag reader disposed on the trigger controlled motorized hand-piece for reading a coded tag associated with an animal subject to injection.