^ Another possible reason why the Waltons ate so much fried chicken -- maybe Kentucky Fried Chicken was near Burbank Studios! Maybe the crew liked the taste of Colonel Sanders' secret recipe. On her Facebook page Kami mentioned, "Sometimes, it was Kentucky Fried Chicken brought in" for the meal scenes.
That reminds me of a commercial that featured fan favorite "Darrell" from The Walking Dead. Darrell is strolling toward the camera while talking about whatever item they are advertising while a "walker" steadily closes on him from behind.
At the end of the commercial Darrell finally comes up to the series buffet table. The "walker" comes up and stands alongside him, looks at the table and says happily "Hey! Meatloaf!"
Darrell simply sighs and says "You guys are always eating."
I've mentioned here somewhere that we raised chickens when I was a kid. They weren't laying hens. There was a chicken farm about 8 minutes drive from where we live. It was a huge farm and I remember buying fresh eggs from there by the flat (36 eggs?). Our hens were purely for eating and I can remember getting batch of chicks for us to raise. We may have had a rooster but I don't remember one.
The Waltons clearly had laying hens. I suspect they bartered extra eggs and firewood (etc.) for the fryers. They certainly didn't have enough chickens to feed that family.