Zincotin was administered in one of the big broiler farms (1,2M broilers per year) in Portugal. Zincotin was given in the first 3 days of the chick (2-5 days of age) before the usual Antibiotic treatment with Enrofloxacin. Afterwards, the Zincotin usage was repeated at the age of (12-15 day) of age. Weight of the broilers in day 24, 36 and 42 were investigated. The Zincotin group had more than 100 gr average weight in comparison with the control group (from the same origin, entering the farm the same day). Ii is concluded that Zincotin give a positive boost to the group of chiks, gaining more weight (that is enough to pay for the investment) as well as more uniform group of animals compared with the control group.