“Sougen no ko Tenguri” (1977) IMDb
Psychic super-bull divulges the secret of cheesemaking to human sibling in prehistoric Central Asia.
Half-hour dairy commercial. Kondou was an artist on it and Miyazaki did uncredited layouts as a favour. Based on a Tezuka story. In reality, cheese is believed to come from the slaughter of calves with milk in their stomachs, as opposed to cattle objecting to slaughter, which is the conceit used here.
References here: The Journey of Shuna (1983).