Congrats on getting in to school! I found that the most helpful courses were not nessecarily animal specific classes. Instead I'd reccommend building up on your cell biology, physiology, biochemistry, etc. This is what will be most helpful your first year and most important to build a good base for later courses (ie pathology, pharmacology, etc). I was a biology major at a non-agriculture school and I lot of my classmates that were animal science majors, etc wished they had taken a lot of the advanced cell biology, etc that I was forced to take (but am happy about it now!).