Fig. 3From: Dietary L-citrulline supplementation modulates nitric oxide synthesis and anti-oxidant status of laying hens during summer seasonFree serum content of amino acids involved in Arginine metabolism. (a) Arginine (b) Citrulline (c) Ornithine (d) Serum free citrulline response to supplemental L-citrulline (e) Arg/Orn + Cit ratio (f) Arg/Lys ratio. Data are significantly different at P < 0.05; n = 8Back to article page