If you keep chickens on the same pasture all the time without rotating it, the soil gets worse, the grass doesn't grow as well, and there are fewer bugs and plants for the chickens to eat.

The study shows that rotating animals between pastures keeps the soil healthier than leaving them in one place all the time, which helps plants grow better—this supports the idea that not rotating pastures hurts the land and the food available for animals like chickens.

The study shows that letting animals graze the same field all the time hurts the grass and soil, which matches the idea that it reduces natural food for animals like chickens.

The study shows that damaged pastures lose a lot of soil and have less plant cover, which means there would be less food like grass and bugs for chickens to eat.