We're back on Andrew McPherson's 520 cow dairy farm as it is time to get cows in calf again. It means constant vigilance identifying cows in heat, ready to be mated.
For six weeks there will be a daily visit from an Artificial Insemination, or Breeding (AI or AB) technician with pistolettes of bull semen. Mating is the most important time on the farm because the whole system hangs around the calving date. It dictates how many days of milking there are a year.