Needle selection and care are essential to quality assurance. When choosing the proper needle for administering the medication, keep the following facts in mind.
When possible, use products that can be administered subcutaneously because they cause less damage to the carcass.
Needle length for subcutaneous infections shouldn’t exceed 3/4 inch. Furthermore, many intramuscular injections can be done with a 1-inch needle.
Always remember that if you feel resistance when the needle penetrates the hide, check for barbs on the tip of the needle. It may be time for a new needle.