THE EFFECT OF MULTIPHASE NUTRITION ON PRODUCTION PERFORMANCES OF BROILERS

Multiphase broiler nutrition is important from the standpoint of nutrition optimization, economical efficiency of production and protection of the environment. Objective of research is to investigate the effect of multiphase nutiriton, i.e. different mixtures used in broiler nutrition, whse protein content has been reduced in several phases during first fattening stage, on production performances of broilers. Investigation was carried out on 608 individually tagged male chickens, Ross 308 strain, divided into 4 groups: T1 (control group) - nutrition with mixture containing 23% of protein from 1-21 st day; T2 - nutrition with mixture containing 23% of protein from 1 st to 7 th day, and from 7 th to 21 st day diet containing 21.5% protein; T3 - nutrition with mixture containing 23% of protein from 1 st to 14 th day and from 14 th to 21 st day diet containing 21.5% protein and T4 - nutrition with mixture containing 23% of protein from 1 st to 3 rd day, from 4-6 th day with 22.55% protein, 7-9 th day with 22.10% protein, 10-12 th day diet with 21.65% protein, 13 - 15 th day with 21.20% protein, 16-18 th day with 20.75% protein and 19 th -21 st day diet with 20.30% protein. Main production parameters were registered during the trial period (from 1 to 21 st day).Through processing of obtained data it ewas established that chickens of the T4 group (2092.42g), had realized statistically significantly higher body mass compared to T2 (2025.00g) and T3 (2020.07g), but not in relation to control group T1 (2055.16g), during trial period of 42 days. Also, it can be concluded that in regard to daily gain in period up to 21st day, no statistically significant differences between trial groups were established, however, for the entire trial period, average daily gain of chickens in T4 group (48.84g) was statistically considerably higher compared to T2 (47.24g) and T3 (47.13g), whereas in relation to T1 no differences were established T1 (47.99). Feed conversion differed between groups, precisely in favor of the application of multiphase broiler nutrition, i.e. feed conversion of the trial group T4 (1.870) was the best compared to T1 (1.918), T2 (2.005) and T3 (1.970). Based on obtained results it can be concluded that multiphase nutrition had effect on production performances, primarily level of food utilization.