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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