Feed and egg laying problems

I just want to share our experience on what we are going through in our poultry birds recently.
The feed we buy to feed our birds now not so good because after consulting this feed they usually drop in egg laying and this has been going on for some time.
Question: what do suggest is the cause ?
Question: what can we do as Farmer to improve our bird egg laying.
Question: what are the things we should do that we are not doing?
Mostly all Farmer in Nigeria now are complaining this.