Translation:Do you like the brown and white owl?
In fact, there is a mistake here and the sentence will be deleted shortly. It should read:
- Dych chi'n hoffi'r dylluan frown a gwyn?
Tylluan is a feminine noun, regardless of the actual gender of the owl, and so it changes to dylluan after y/'r. And for the same reason the adjective brown must mutate to frown.