Question:  query regarding some duck showing the signs of lameness 
Answer: told him to reduce the protein source incorporated in the diet [ like maize, soyabean --etc ] at least for 7-8 days, inject tribivet [ 10 ml /30 ml ]- inject 0.2-0.3 ml intra mascularly every on alternate days in either side of the thigh for 4 days, orally -- vitalex @ 7 ml  / lits of drinking water /100 ducklings for 6-7 days