Until I read this article I didn't understand why my chickens preferred their 50 sq ft run over their big one ( 8 x 16 ) After I removed the UV treated tarp they use them both.
It can be a deficiency, lack of sunlight, too many greens or other foods or a health related issue.My hens have crushed egg shells 24/7 so I'm cutting out th eir greens,sunflower seeds (and scratch) Sometimes you have to force them to eat more of their layer feed.I don't free range so its a...