|Better Farming Series 13 - Keeping Chickens (FAO - INADES, 1977, 48 p.)|
|How poultry make use of food and water|
53. You should mix vitamins in poultry feed if the birds are kept in a yard.
Otherwise the birds get vitamins by eating grass. Vitamins are given in very small quantities.
The farmer cannot produce them.
You have to buy them.
Vitamins can be bought in shops or from the animal husbandry centres.