This study aimed to investigate the effect of oral supplementation of rumen-protected
L-arginine on semen quality, testes, and accessory genital glands biometry in rams.
Ten apparently healthy and fertile rams were randomly divided into two equal groups;
control, and rumen-protected L-arginine (20 mg/Kg body weight for 30 days) treated
group. In all rams, ultrasonographic measurements of the testes and the accessory
genital glands and blood sampling were performed at day (D)10, D20, and D30 (D0 is
the start of supplementation). Semen ejaculates were collected twice/week and semen
quantity, and quality was examined. Our results showed that, in the L-arginine treated
group, there were significant increase in the ultrasound biometric measurement of right
seminal vesicle (RSV) and right Cowper’s gland (RCG) at D10, both testes, tail of the
epididymis (TE), SV, and CG of both sides at D20, and of both testes, RTE, RSV, RCG,
and LSV at D30. Semen quality and quantity parameters were significantly improved in
L-arginine treated group. Moreover, testosterone level in the L-arginine treated group
was significantly higher than that in the Control group. Serum thyroxine and glutathione
peroxidase concentrations were significantly higher in the L-arginine treated group. The
present study concluded that oral supplementation with rumen-protected L-arginine is
beneficial in improvement of rams’ fertility.