PROMOTING ACCESS TO AFRICAN RESEARCH

African Journal of Biotechnology

Log in or Register to get access to full text downloads.

Remember me or Register



Serum testosterone in Arabian stallions during breeding and non-breeding seasons in Iran

G Saad, F Barati, NV Hossein, AM Hassan

Abstract


The study was conducted to investigate the serum testosterone concentrations of Arabian stallions during breeding and non-breeding seasons under natural photoperiodic condition in west south of Iran (Khuzestan Province; latitude 48:40°N, longitude 31:20°E and altitude 22.5 m). The blood samples (10 ml) were collected from the jugular vein, and it stood at room temperature for 3 h and was centrifuged. The sera were kept at -20°C until assayed by radioimmunoassay. The results show that total serum testosterone levels (ng/ml) in Arabian stallions was higher in May to June (Summer Solstice; 1.08±0.078) than in November to December (Winter Solstice; 0.65±0.11) (p<0.05). We conclude that serum testosterone concentration during the non-breeding season is lower than that of the breeding season. The results confirm a seasonal rhythm in the reproductive cycle of Arabian stallions over the year in this specific region.

Key words: Arabian stallion, season, testosterone, photoperiod.




http://dx.doi.org/10.5897/AJB11.1493
AJOL African Journals Online