Ultrasonographic examination and measurement of ram testicles

Ten adult rams were used in a study to compare ultrasonographic and physical measurements of testicles. Scrotal circumference measurements were correlated with both physical and ultrasonographic measurements and with semen analysis results. Scrotal circumference correlated well with most of the physical and ultrasonographic measurements and with semen motility and percent abnormalities. Ultrasonographic measurements correlated with scrotal circumferences but not with the semen analysis. There were significant differences in physical and ultrasonographic measurements of testicle circumference and diameter, especially when the ultrasonographic measurements were made through the intact scrotal wall. There appear to be problems in the accuracy of ultrasonographic measurements of testicle size in rams.