Effects of dietary rosemary essential oil on semen quality of broiler breeder roosters

Effects of dietary rosemary (Rosmarinus officinalis) essential oil were evaluated on the semen quality of broiler breeder rooster using sixteen 24-wk Ross 308 male birds. Experimental groups were consisting of four treatments (0, 50, 100 and 200 mg rosemary essential oil/kg of feed) with four replicates per each group. Semen samples were collected on days 0, 14, 28, 42 and 56 of experiment. Results showed that 100mg rosemary significantly improved several traits of sperm such as Amplitude of Lateral Head Displacement (ALH), Average Path Velocity (VAP), and Straight Line Velocity (VSL) on days 42 and 56, and sperm Membrane Integrity (MI), sperm viability, Linearity (LIN) and Total Motility (TM) on day 56 (P