GUDEV, D., MONEVA, P., POPOVA-RALCHEVA , S., & SREDKOVA, V. (2011). TONIC IMMOBILITY AND ADRENAL RESPONSE IN CHICKENS FED SUPPLEMENTAL TRYPTOPHAN. Bulgarian Journal of Agricultural Science, 17(4), 560-566. https://agriacad.eu/ojs/index.php/bjas/article/view/6018