Plant extracts fed to broilers gave live performance
levels similar to those of the antibiotic growth promoter,
results that agree with Jamroz and Kamel (15) who
observed improvements of 8.1% in daily gain and 7.7%
in feed conversion ratios in 17-d-old poults fed a diet
supplemented with a plant extract containing capsaicin,
cinnamaldehyde, and carvacrol at 300 ppm. In contrast,
Botsoglou et al.