Which of the following is NOT one of the identified classes of poultry?

The identified classes of poultry are categorized based on their origins and characteristics, and the correct answer reflects a class that does not exist within these established groupings. The American, Oriental, and English classes are recognized categories that include various breeds specific to those regions, focusing on characteristics such as production traits, feathering, and size.

The American class typically includes breeds such as the Rhode Island Red and Plymouth Rock, which are known for their adaptability and hardiness in diverse climates. The Oriental class includes breeds like the Cochins and Silkies, recognized for their unique appearance and gentle nature. The English class encompasses breeds such as the Sussex and Orpington, valued primarily for their meat and egg production capabilities.

In contrast, the Mexican class is not formally recognized in poultry classification, distinguishing it from the other established groups. The absence of a designated "Mexican" class indicates that it does not meet the criteria or characteristics that the poultry industry has adopted for classification purposes. Thus, this choice correctly identifies an option that does not belong to the recognized classes of poultry.