Yearling: a male or female horse or pony that is one year old

Yellow Body: Corpus Tuteum

Yellow Star Thistle Poisoning: a degenerative brain disease caused by ingestion of yellow star thistle (Centaurea solstitialis) or Russian knapweed (Centaurea repens)

Youth: an exhibitor eighteen years of age and under. Additional age divisions are often created to separate children further

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