Thinking out loud ...

While I was studying in college, we dealt with lots of subjects regarding medicines (we did have pharmacology as a subject), but not so much with testosterone creams. Or I could be mistaken. But I guess that's because animals were rarely treated with hormonal replacements, like humans. Unless, maybe if you are dealing with breeders. Then that's when hormonal treatments are necessary. Still, not as extensive as humans, I suppose. Animals normally breed faster than humans, but there are exceptions, of course. :)

Just rambling. :))