Are you zoned for a business? They may have put that stipulation on you because with that amount of land you could clam it as agriculture,, here you have to have at least 5 acers and a certain amount of animals or grow something that you harvest every year, without AGG exemption your property taxes are higher, mine are like 7 dollar per 5 acers a year ,without AGG they went up to 528.00 when the exemption was dropped at sale of that 5 acer property.
What i am trying to point out is that if you qualify for an agg exemption you can have your taxes lowered, if you have enough animals to qualify and make money doing it you can pay way way less in property taxes because your land is being used to make a profit.
There just may be a bit more to it than having more birds, just sayen