I went to the feed store and they gave me tylan 50. I dont see dose for chickens. I have my sisters needles that are 1/2 cc a line. The pullet is 6 weeks old. She has a respitory cold and i need to give this to all the pullets from that pen. Can anyone help? The smallest dose on the box is for swine 4mg per pound or 1ml per 12.5 lbs. HELP!