http://www.assist-nps.com/imp_for_poultry.htm
This is what you need. There must be a company in Turkey who makes a food supplement like this one. This company is in Illinois, USA. I do not know if they ship to Turkey. Look for a Turkish company who makes a product like this one . There are many companies worldwide who make this kind of supplement. It is current research and very good for chickens. They speak of "stress" . In worldwide poultry industry "stress" is nerves, fright, or plain diet . Anything which makes chickens not perfect. A treatment like this would be excellent for your chickens. I spend much time studying these trends. Much study is being done on making supplements to help chicken people who use plain diets. These supplements make the diets rich like top grade food. Excellent for adding to wheat and corn diet. Birds also need grit. Small pebbles to help grind the corn and wheat.
Best,
Karen