There were some farm animal films too. I remember one was showing animals while some peculiar music played. After a little while the music ends. Then we hear sounds the animals make (like sheep bahhhing, pigs grunting, and a dog barking). When I was in kindergarten (1972-1973) the teacher showed this film on one of those old projectors with the big film reels. I knew every part that was coming, having seen it at home on television several times. At the time I was pleasantly surprised that we got to watch some Sesame Street in school, but maybe this film predated Sesame Street.
Then there was one with a catchy song about the proverbial question,"Which came first, the chicken or the egg?" Much of the film showed the production process of eggs in cartons, from what I recall.
And one I don't remember too well except for the beginning showed a man riding a tractor. A man starts out humming something like, "Bum bidda bum bidda bum bidda bum bidda lum bum bum bum." Then he starts singing with, "Roosters live on the farm.." After that I draw a blank as to the specifics, but I imagine it continued to take place on a farm.
I'm sure there were other farm animal ones. One I am extremely vague on started out with a man saying, "Milk. Did you know milk comes from a cow?"
Then I think it showed a cow being milked. Not sure, though, if the film focused on cows or on the production of milk (from the cow to the grocery store in containers).