Two hundred twelve broiler chicks were randomly assigned to two groups: chicks of the first group, "control group", consumed an enrofloxacin based antistress from day 1 to day 29. Birds of the second group, "fenugreek group", consumed aqueous extract of fenugreek Trigonella foenum-graecum as a replacement for the antistress. Fenugreek was administered during three consecutive weeks: at a dose of 7 g / l, from day 15 to day 21, at the dose of 14 g / l, during the second week of use (day 22 to day 28), and at the dose of 28 g / l, during the third week (day 29 to day 35). 10 days prior to slaughter, fenugreek administration was suspended. Birds of the two groups received the same diet, formulated to cover appropriately, the birds’ energy and protein requirements. Drinking water containing the treatments was distributed according to the daily consumption needs of the birds. Weight growth differed significantly (p> 0.05) between the two groups; the best live weight was obtained in the "fenugreek" group, 2956.84 g versus 2936.58 g, for the control group. However, the difference in feed conversion ratio between the two groups was not significant. The best carcass yield was obtained in the "fenugreek" group with an average percentage of 76.67%, while the "control" group attained a yield of 75.82%. Furthermore, mortality rate was lower in the fenugreek group, 6.60% versus 9.34% for the control group. In the light of these results, fenugreek can be proposed as a substitute for synthetic enrofloxacin based antistress.
