Bullwinkle (Bill Scott) continued to shill for Cheerios well after his series had ended production. I guess Jay Ward figured, as long as his company was commissioned to produce ads for Quaker Oats, a rival to General Mills, why not continue to crank out some work for Cheerios, using Bullwinkle?
Here, Bullwinkle tries to bowl and shill at the same time.
Paul Frees is the narrator. I don't get how he and others could mispronounce "protein" back then. Here, it is pronounced, "pro-tee-en", but I've always said it as "pro-teen". Go figure.