With breeding sheds opening last week across North America, farms have been quietly preparing stallions for the demanding months ahead of them. All jokes about them having the best jobs aside, stallions have to be ready for a marathon during breeding season. It's not simply a matter of bringing stallions up from fields and expecting them to be ready to cover a full book of mares over the ensuing months. Perhaps that may work for small operations where a stallion covers a handful of mares all season, but for the...