Interrelationships between the certain morphometric sizes of testes to each others and to sperm quality were evaluated in Merino rams. The study was carried out on a total of nine rams two years old, having high fertility and nearly equal body weights. Rams were divided into three groups on the basis of testicular volume. In first (n:3) second (n:3) and third (n:3) groups testicular volume measuraments were in the range of 300-500, 500-700 and 700-900 cm³, respectively. Four semen samples of each ram were collected with a weekly intervals and spermatologic features of rams were recorded.

As a conclusion, a positive correlation between scrotal circumference, testes width and testes volume were detected. Testes length had a nonsignificant correlation with scrotal circumference and testes volume. Although spermatologic features are not different in groups containing the rams having different testes volume, a positive correlation was detected between testes length and sperm concentration per milliliter.