That's the answer I usually give but in this case, I don't think Ghana has the assortment of commercially prepared complete feed that is available in the US.
Land O' Lakes just recently announced a partnership to make feeds in Kenya but I don't think distribution has begun to other countries...
Have you checked to see how your neighbors feed their chickens?
Here's a bit of info for you.
Do you have access to cassava or fishmeal?
http://www.thepoultrysite.com/articles/2989/cassava-as-animal-feed-in-ghana-past-present-and-future/...
I don't know where you live and what forage is like there or even if you have a complete poultry ration available to buy.
Maize alone is not only deficient in vitamins and minerals but more importantly, amino acids.
How old are the birds?
Here's what chickens need...