Fig. 2

Chicken embryonic heart rate following exposure to fluoroquinolones - day 19 of incubation. Groups: C1 = untreated control, C2 = sham-treated control eggs (aqua pro injectione); E1, E2, E3 = groups exposed to 1, 10 and 100 μg of enrofloxacin per 1 g of egg weight, respectively; M1, M2, M3 = groups exposed to 1, 10 and 100 μg of marbofloxacin per 1 g of egg weight, respectively; * = p < 0.05, ** = p < 0.01 (when compared against control group C1 or C2), n = 26 for each control group and 20 for each exposure group