ABSTRACT The morphometry and sperm reserves of the testis, epididymis and vas deferens of 19 sexually active adult local cocks were studied. The average live weight of the cocks was 1.879±0.316 kg and that of the paired testis, epididymis, vas deferens were 12.17±4.75 g, 0.52±0.19 g and 1.36±0.56 g, respectively. The length of the testis, epididymis and vas deferens were 3.42±0.50 cm, 1.91±0.38 cm and 11.5±1.34 cm, respectively. In majority of cases, the parameters of the left organs were insignificantly greater than those of the right. The width, thickness, circumference and volume of the testis as well as the diameter and volume of the epididymis and vas deferens were recorded. There were strong positive correlation between the weight of the testis and epididymis (r=±0.82) or vas deferens (r=±0.66). The gonadal sperm reserve was 2.11±1.11 x 10 9 sperm (173.7±71.5 x 10 6 sperm g -1 ) and the extrangonadal sperm, 1.77x 10 9 sperm. The vas deferens with 89.8% of the extragonadal sperm reserved as the main storage organ of sperm for use during threading. Sperm reserve was positively correlated to body weight (r=±0.77, P = 0.000) and to the length of the testis (r=±0.55, P = 0.015). This may suggest that body weight and testicular length are indicators of fertility. The high gonadal sperm and hence reproductive potential may reflect an adaptive change in the local cocks, which have a very high mating frequency per day
