What does a notch on the left ear in swine indicate?

A notch on the left ear of swine is utilized to indicate the pig's number within a specific litter, helping to identify individual animals. This system of ear notching is part of a larger method of livestock identification that also includes notching on the right ear, which represents the litter number. By keeping track of these notches, producers can maintain accurate records of breeding and lineage, monitor growth and development, and make informed decisions on animal management.

The use of ear notches allows for easy visual identification of pigs when they are grouped together, assisting farmers and caretakers in their daily tasks. This practice is standard in the swine industry, ensuring that each animal can be traced back to its origin and unique identity.