الفهرس 
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Abstract
This study aimed to investigate the effect of dietary supplementation of Guanidinoacetic acid (GAA) into basal diet of broiler chicken on the productive performance, behavioral patterns, welfare indices, carcass traits, immune response, intestinal villi histomorphometry, stress indicators, antioxidant status and biochemical parameters related to liver, kidney and muscle health status of broiler chicken reared at standard and high stocking density. The birds were distributed into four groups: two standard stocking density (SSD) (10 birds/m2) groups, (group with basal diet only and group supplemented with 600 g/ton feed GAA) and two high stocking density (HSD) (16 birds/m2) groups, (group with basal diet only and group supplemented with 600 g/ton feed GAA). Average body weight (ABW), average body weight gain (ABWG), average feed intake (AFI), and feed conversion ratio (FCR) were measured weekly and finally throughout the whole period of the study (35 days). Behavior patterns were observed and recorded using video cameras inside each pen. Carcass traits, histomorphometry of intestinal villi, antioxidant status and biochemical parameters were measured at the end of the trial while immune response against NDV vaccine was determined at two periods (day 21 and day 35). The results of this work revealed that GAA could ameliorate the stressful conditions of HSD and avoid the negative impacts on growth performance that appeared in the improvement of BW, BWG and FCR, improvement in foraging behavior, increase dressing percentage, reduce stress hormone (corticosterone), increase glutathione peroxidase (GPx), catalase (CAT) as antioxidant enzymes while decrease nitrite as free radical so, GAA could protect the body from oxidants which are harmful. As well as reduced the activity of alanine aminotransferase (ALT) and creatinine in serum which reflected the good condition of liver and kidney health status. So that the addition of dietary GAA into basal diet of broiler chicken is recommended especially in broiler reared in stressful conditions. Also, this point needs further investigation and examination of different GAA concentrations.