Laying hens require feed with 16% to 18% protein and 3.5% to 4.5% calcium — that's three to four times the amount of calcium found in feeds for pullets (young chickens). Feeding layer feed to ...

The lion’s share of poultry production costs are embedded in feed. An article published about the research by Phys.org claims that 65% of poultry production costs come from feed in Australia.

But chickens are quite efficient and can achieve feed conversion ratios in the 1.5 to 1.9 range. That would mean with every kilogram and a half of feed, the chicken grows one kilogram.