Hello all, i’ve owned my silkie chickens for two years everything was great until I started letting them free range about 8mths ago. I’ve lost a few to I’m assuming respiratory infection. A few have swollen eyes. About 6 weeks ago I tried Tylan200 Orally which worked for some but a few are showing signs so I decided to bite the bullet and just try to give them injections. My question is how much tylan 200 do I give my silkies they are very light prolly only 1-2lbs. Thank you!