A COMPARATIVE STUDY OF THE GROWTH PROMOTER EFFECTIVENES FOR DIFFERENT DRUG FORMULATIONS, CONTAINING OREGANO OIL FOR BROILER CHICKENS

A comparative study for broiler chickens using different drug formulations, containing oregano essential oil was added daily: Ecodiar® liquid 5% to the drinking water; Ecodiar® powder 5% and oregano oil 1% to the complete feedfrom the 1 to the last day of the finishing period (day 41). The experiment included 80 clinically healthy broiler chickens of the both sexes, 1-day old, hybrid Cobb-500, bred to the last day of the starter (n = 40) and bred to the last day of the finishing period (n = 40). In the dynamics (during the starter and finishing period), the indicatorswere determined: body weight, average daily gain, feed intake per capita/per day, energy and protein intake, feedefficiency, energy efficiency and crude protein efficiency per 1 kg gain, weight of thecarcass, liver, heart, gizzard, spleen and bursa of Fabricius. The our results showed thatin body weight gain and carcass, liver, spleen and heart weights of the broilerswithout statistically significant differences were observed compared to the control group during the starter and the finishing periods In the gizzard weight of broilers that received Ecodiar® liquid 5% and Ecodiar® powder 5% with statistically significant differences were observed during the starter period, compared to the control group (p < 0.05). In weights of the bursa Fabricius in broilers that received Ecodiar® liquid 5% and 1% of oregano oil (p < 0.05) with statistically significant difference was observedduring the grower‐finisher period.