I have finally present you with the ability to buy, sell and transport chickens in FS17.
Please note this must be imported into a mod map through giants editor there is a short tutorial within zip file.
There is also a modified version of the Joskin Betimax RDS7500 that can transport chickens there is a dummy placeholder as I am cannot model chickens to save my life but other than that works great.
Please note this has not been tested in MP but should work 100% please let me know if anyone has tested this in MP.
Please do note upload this to any other sites with out my permissions.