I am wondering how much serious thought you have given this with regards to having animals unless you are living there. All four animals you have talked about require daily attention, twice daily at times. Goats won't stay in those fences unless they are tethered, ponies or horses require hard feed and hay, covers taken off in the warmer days and put on at nights, donkeys can be noisy and pigs also require feeding daily, to say nothing of what they will do to the land if you don't put a ring in their noses. Tenants are not going to look after your animals properly unless you pay them, not them pay you rent. You are more likely to get tenants if you leased out the whole property and let them bring their own animals.
I gather that this is bare land, no house already on it?