Yeah, I'd definitely say that breeding them counts as an extra curricular activity, and if you're selling some of the offspring, then it could even count as a work experience. You don't have to be living off of the money you make from it for it to count as "work experience". I mean, you're selling them, so you have to talk to potential customers and deal with them, as well as choose prices and balance costs, etc. If I were you I would use it, because from what I'm getting from that question, it fits what they're asking for.