Cock o' the Walk is a Silly Symphonies animated Disney short film.
[1] The titular Cock comes home, a boxing champion laden with golden trophies, and the birds of the fowl run to greet him with a Busby Berkley-esque display.
The Rooster, furious at his love interest getting taken, challenges the Cock to a fight, and is being soundly beaten until the Hen discovers a photograph of the Cock with a plump hen and multiple chicks, on which is written 'To our Daddy'.
She then shoves the paper and slaps the Cock's face for being a cheater, then rushes over to the beaten Rooster.
The short was released on December 19, 2006, on Walt Disney Treasures: More Silly Symphonies, Volume Two.