Yes. The minimum dose recommended was 20 mg/Kg. That equates to 0.45 mls per bird at a 5 pound average weight.
Roundworms will drop at 1 mg/Kg dose given 5 consecutive days.
Not according to this post.
I just did a weight check on my flock. Weights for 3 EEs, 1 WLH, a WLH mix, a PBR, RIR... these birds weights averaged 5 pounds.
Did you give them Safeguard liquid goat dewormer?
Poultry DMV states 20-50 mg/Kg of fenbendazole to deworm a chicken.
The average LF chicken weighs about 5 pounds or 2.27 Kg. Safeguard liquid goat dewormer is 100 mg/ml. The acceptable dosage range is then 0.45 to 1.13 mls per bird.