Last year there was drought the entire summer in my country, followed by a month of constant rain in the harvesting period. The result was a serious lack of grains to feed animals. Especially cow- and sheep farmers were affected, as they're big animals. They even had difficulty filling up the silo's with grass, and were resorted to slaughtering their livestock or feeding them substandard feed such as straw through the winter.
There's certainly a good idea to look to other feed sources than pre-fabriced chicken feed. Whole grains can be stored longer than crushed. I've stored for a couple of years without issues. I pick berries in autumn and store in the freezer, I'm given fallen apples from someone with apple trees, and grow a little bit of kale. More of a treat than a substantial food source, though...
There's certainly a good idea to look to other feed sources than pre-fabriced chicken feed. Whole grains can be stored longer than crushed. I've stored for a couple of years without issues. I pick berries in autumn and store in the freezer, I'm given fallen apples from someone with apple trees, and grow a little bit of kale. More of a treat than a substantial food source, though...