First off you may use any call you like, you will not be confined or obligated to use a specific call. As far as the calls themselves go, you will be told before the contest which calls you will be required to perform. When you take the stage the announcer will ask you to perform the calls one at a time. It will be like this; "Caller #3, your rendition of a cluck" "Caller #3, your rendition of a plain yelp" so on and so forth. Good luck, i am entering a couple of local contests in March myself.