Figure 1.

Schematic diagram showing the experimental protocol for the effect of oral administration of rumen-protected L-arginine on the testes and accessory genital glands of rams. Rumen-protected L-arginine was supplemented for 30 days (D0: day of the start of supplementation). Ultrasonography and blood sampling for further biochemical and hormonal assays were performed on D10, D20, and D30. Ram sexual behavior was daily observed and collection of ram semen (2 times/week) was done starting from D14 until D60.