I rather doubt that a 3 month pullet weighs 12 pounds. She is probably closer to 1 or 1.5 pounds, if that. And the drench was recommended in conjunction with Corid treated water.Not to knock anyone but typical oral drench dosage of Corid 9.6 is 0.1mL per pound, so 1/4 teaspon is a 12 pound chicken dosage. I dont think it would cause any adverse side effects, just wanted to mention the recommended dosage.