Mutt Farm
Songster
Hi! If you have 4 total with one not laying yet, you're ok. Not every breed lays every day, even the best layers. They do tend to slow down as daylight gets shorter too. Your feed is perfect, not the problem. Can't see weather being a factor either. To expand you flock, maybe have a look at Delaware, Australorps? I'm biased, they tolerate the heat very well, lay big pretty eggs often, they are docile easy keepers for me. I'm sure there are plenty of others that might work better for what you want. Here's a couple links that might help you narrow it down.We have a Rhode island red (Still laying) , An Americauna (Still laying) , A Jersey giant (was laying) and a Brahma (Hasn't laid yet). They all seem happy and healthy , weather hasn't changed much - still 90's daily here in Florida.They are eating layer crumble, dried meal worms as treats and free range in our yard for the most part. They were all born in early March.
https://www.backyardchickens.com/a/...cken-guide-to-picking-backyard-chicken-breeds http://www.livestockconservancy.org/index.php/heritage/internal/chicken-chart