Influences of dietary selenium, zinc and their combination on semen characteristics and testosterone concentration in mature rams during breeding season

摘要

ABSTRACT This study was conducted to determine the effect of dietary supplementation of organic zinc (Availa ???? Zn100) and selenium (Availa ???? Se1000) on semen characteristics, testes measures and serum testosterone concentration. Twenty Sanjabi rams (50.01?￠???????±?￠????5.6?￠????kg) were randomly divided into four equal groups, given the basal diet as control (C) or supplemented with 0.3?￠????mg/kg Se (SE) or 40?￠????mg/kg Zn (ZN) or 40?￠????mg/kg Zn plus 0.3?￠????mg/kg Se (ZS) for 120 days experiment (from July to November). The semen samples and blood samples were collected every 3 weeks and scrotal circumference was measured every 15 days. The results indicated that scrotal circumference and testosterone concentrations did not differ due to treatment ( P ?￠????>?￠????.05). In contrast, semen characteristics were affected by ZS supplementation. The sperm density and total sperm number increased ( P ?￠????