THE EFFECT OF ESSENTIAL OIL OF ROSEMARY (ROSMARINUS OFFICINALIS) ON TO THE BROILERS GROWING PERFORMANCE

In recent years medicinal plants have been studied from the perspective of their use as growth promoters and replacement of antibiotics. The aim of the research was to determine the effect of different levels of oil on growth and development, increase of weight gain and feed conversion to increase growth, water consumption and sustainability of chicken meat. Were used 250 broiler chicken Ross 308 distributed in five lots, L1 (0.1%), L2 (0.5%), L3 (1%) L4 (1.5%) and M (0.3% avilamycin). The experiment during 42 days. The data obtained were statistically processed. For the average body weight and growth rate the best values were recorded in the lot with antibiotic and in the lot with 0.5% oil, being higher with 2.43% (L1), 4.97% (L3), and 5.9% (L4), feed conversion in growth rate was approximately the same for lots M, L1, L3, and L4, the values recorded were different depending on the level and type of additive used, the best results were recorded in the lot L2 being higher by about 5% compared with M. The best values for water consumption were recorded in the lot L2 with 6.39% higher compared to the lot M. The lowest values of mortality percentage were recorded in the L2. In conclusion, the level of 0.5% essential oil of rosemary can be considered a possible natural growth promoter for chicken broilers