Lens recommendation needed

I use the a700 and have a complement of full frame lenses. However I am now doing livestock photography where I need to be 30-60 feet from the subject. The 100-200mm range works best. Is there an APS-C lens that covers that range? I already have all the Beercans, 75-300D's and a couple 100-200's, all full frame. Thanking you in advance.