Farmpony had it right. In most show and racing circuits, every horse's unofficial birthday is january 1. This was to make things "easier" in keeping track of a horses age. Instead of saying "he was foaled december 3 of 2002" and then having to figure out exactly how old he was, they say "he is an 02 foal" automatically making him 7 years old even if he may only be 6 years and 1 month.
As for the OP. I agree with a lot of you. I am all for what PETA started out as. Animals have to have some kind of protection against the cruel and abusive people of the world. But they allowed the fanatics to take over. The one's who burn the logging trucks and throw red paint on peoples fur coats actually scare me. Yes, I do love all animals and want to see them treated with kindness and respect but the main point is the fact that they are still just animals. Animals are beasts of burden put on this world to carry us, feed us, and clothe us. Along the timeline, they became our friends and many people have forgotten their original purpose. Horses, cattle, sheep, goats, etc are prey animals. They were designed to be food for the predator animals. Just because we love them doesn't change that.