The categorical segregation of the statements provided are as follows:
Major Premise: All horses are fast creatures.
Minor Premise: thoroughbred is a breed of a horse.
Conclusion: All thoroughbreds are fast creatures.
Explanation:
A syllogism is a type of developmental argument that reflects a strong belief that a writer or an author holds. The major and minor premises are parts of the same.
A major premise is one that holds a predicate of the main subject.
A minor premise is one that holds a specific example for the major premise.
A conclusion is made based on the major and the minor premise given.