“The Effect of Using L-Arginine as a Feed Additive on Testosterone Levels in Ross 308 Broiler Breeder Roosters: The Effect of Using Arginine on Testosterone Level in Roosters of Broiler Breeders” (2026) Journal of Hama University, 8(4). Available at: https://journal.hama-univ.edu.sy/huj/article/view/2990 (Accessed: 5 June 2026).