We had 3 horses when our kids were little, two mares and a gelding pony. Our youngest son asked his older brother if we couldn't breed Babe to Nugget, or Sunlight to Babe....and he came up with every combination for breeding the horses so we could have a colt. His brother kept explaining that the mares were both 'shes' and the gelding was an 'it'. After thinking this over for a little bit, he asked, "Hey, Dad, what's breeding?