To evaluate the effect of
L-Threonine (L-Thr) and Mycofix® Plus (MP) on
aflatoxicosis, an experiment with a 3-way ANOVA model was carried out with 8 replicates and 640 birds. Treatments included two levels of L-Thr (100% and 125% of the requirements, Cobb 500, Cobb-Vantress),
Aflatoxin B1 (AFB1) (0, 500 ppb), and MP (0, 1 g/kg). As the main effects showed, AFB1 decreased breast meat yield and carcass percentage (p < 0.001), serum
urea, antibody titer against infectious bronchitis virus (IBV), and bone density (p < 0.05), while it increased the plasma concentrations of
glucose and
alkaline phosphatase (ALP) (p < 0.05).
Mycofix Plus improved the grower feed intake (FI), tibia fresh weight, and
body weight (BW) to bone weight (p < 0.05).
L-Threonine increased the grower FI, breast meat yield, serum
aspartate transaminase (AST), and
glutathione peroxidase (GPX) (p < 0.05). There were positive interactions with breast meat yield,
cholesterol,
lactate dehydrogenase (LDH), and IBV titer. Of the treatments used, the combination of L-Thr and MP without AFB1 improved breast meat and carcass percentage.
L-Threonine and MP significantly improved IBV titer in birds challenged with AFB1 (p < 0.001). In conclusion, L-Thr and MP were beneficial to improve immunity.