What is a critical piece of information that Kevin needs to record from the label when giving an antibody to his pig going to slaughter?

The withdrawal period is crucial information that Kevin must record from the label when administering an antibody to his pig. This period is the time required after the last treatment before the animal can be slaughtered and its meat sold for human consumption. It ensures that any residues from the antibiotic or medication are cleared from the animal's system, thus safeguarding food safety. Compliance with the withdrawal period is a regulatory requirement, and adhering to it helps prevent potential health risks to consumers who might ingest meat containing drug residues.

While information such as the animal's breed, the dosage of the antibody, and the vaccination date are important for care and management, they do not have the same immediate health and safety implications for consumers as the withdrawal period does. Therefore, focusing on the withdrawal period is critical for ensuring the meat is safe and in compliance with health regulations.