Annual Change of the Testosterone Hormone in Male White Goats

In this research, changes of testosterone hormone in the blood serum of 9 male (3 of age 2 and 6 of age 4) White goats have been studied for a duration of one year. Analyses performed show that the general monthly averages of the testosterone hormone of the male White goats in the period of 12 months starting in January were (2.11±0.73), (2.22±0.52), (2.44±0.59),(2.10±0.41),(2.35±1.00), (3.42±1.48), (4.77±1.32), (5.61±1.40), (7.91±1.24), (10.84±1.59), (7.82±1.60), and (2.63±0.61) ng mL-1,respectively (P<0.05). The effect of the age factor on the testosterone production in White goats (age 2 and 4) was generally significant (P<0.05) for differences among months in each age group, but not significant for differences between age groups in each month. The testosterone hormone levels of male White goats encountered significant changes (P<0.05)with respect to the season.