My minecraft is without the horses in the new version of snapshot! (1.7.0)

I was good in my world when I found saddle then I decide to go after the horses have not found any more I searched around the biomes of my world, then I decided to keep creating worlds and looking up some horse and have tried all biomes and I found none. Remembering that my world was not in earlier versions ... Created when they released 1.7.0 Snapshot! If this bug is I do not know ...