Aditivos zootécnicos associados aos antimicrobianos sobre o desempenho, diferencial de leucócitos e atividade de fagocitose de frangos de corte

Abstract

The use of zootechnical additives in poultry is an important tool to assist in synergy with the action of antimicrobial performance enhancers (APE). Therefore, the aim of this study was to evaluate the use of zootechnical additives in association with APE on the performance, leukocyte differential and phagocytosis activity of broilers. Were used, 1,400 male chicks of the Cobb® lineage, one day old, distributed in a completely randomized experimental design, with seven treatments, eight replications with 25 birds per experimental unit. The treatments were composed of a basal diet without the use of APE, a basal diet with the addition of APE; basal diet with APE + prebiotics 1 (fructooligosaccharides and galactooligosaccharides) and 2 (1.3 and 1.6 beta-glucans and mannanoligosaccharides); basal diet with APE + prebiotic 1; basal diet with APE + probiotic (Bacillus subtillis LFU160); basal diet with APE + essential oil (cashew nut shell liquid (CSL) and basal diet with APE + organic acid (glycerides of butyric acid). There was an effect (P<0.05) on weight gain, feed intake, feed conversion and the productive efficiency index for broilers from 1 to 44 days of age, with better results for treatments with zootechnical additives plus APE. There was also an effect (P<0.05) on variables related to phagocytosis activity, in general, treatments without APE and with APE, without the use of additives, had the highest percentages and number of occurrences of this activity. The use of zootechnical additives associated with antimicrobials performance enhancers can be used in diets for broiler from 1 to 44 days of age, as they contribute to performance, as well as helping to modulate the poultry's immune system. It can be concluded that zootechnical additives can be used in association with APE to ensure better feed conversion of birds from 1 to 44 days of age and better development of the immune system of broilers, especially in the initial phase.