Here is how it's done in the Texas FFA.

One of the few contests I never trained students for.

Livestock judging contests were net my favorite as you are judging animals and comparing what you think is good against what the "official" judge thinks is good. My logic was always about a half bubble off level. That's why I preferred the Ag Mechanics contests

https://www.texasffa.org/cde-poultry

National Collegiate contest is most likely similar.