CHICKENOLOG! Like a vulcanolog but with chickens!Chicken wha?
People have different definitions of "hobby". I think a few hundred birds kept to provide sufficient stock to breed from and sell can still be a hobby.
Hobby is somthing that is appendix to your real life, that give you satisfaction and pleasure, it's usually in most hobbies, absorb money and not producing it, but the most important is that it doesn't take from you time that you need to invest in your "real" life and family, treatment of 160 chickens daily is not a hobby, it is a pseudowork.