title: Effect of age, pubertal stage and season on testosterone concentration in male dromedary camel.
abstract: The present study was conducted in the Laboratory of Animal Physiology and Biotechnology, Department of Animal Production, Faculty of Agriculture, Mansoura University, Egypt. The present investigation aimed at studying effects of ages, pubertal stages and seasons of the year on testosterone concentrations in blood plasma and tissue homogenate of the testes. The testes used in the current study were collected from a total of 104 one-humped male camels (Camelus dromedarius). Samples were taken from pre (1-3.5 years) and post (3.5-13 years) pubertal camels. Testes were studied for a two consecutive seasons. The freshly prepared homogenate of the testicular tissue and blood plasma were used for determining the concentrations of testosterone in plasma and testicular extract. The concentrations of testosterone in blood plasma and testicular tissue were significantly increased during the breeding season compared with that of non-breeding season; the concentration of testosterone was higher in testicular tissue than in blood plasma. Testosterone concentrations in plasma and testicular tissue were increased in breeding than in non-breeding season. In addition, the testosterone concentrations were closely related with seasonal changes, stage of puberty and advancing age.
authors: Department of Agriculture, Mansoura University, Elmansoura, Egypt.
authors: M A
authors: MA
authors: El-Harairy
authors: K A
authors: KA
authors: Attia
keywords: Age; Camel; Homogenate; Plasma; Pubertal stage; Season; Testis; Testosterone
references: Endocrinology. 1989 Oct;125(4):1829-43
references: 2791968
references: Endocrinology. 1993 Nov;133(5):2277-83
references: 8404681
references: Biol Reprod. 1995 Feb;52(2):226-36
references: 7711192
references: Vet J. 2001 Nov;162(3):241-9
references: 11681875
references: Theriogenology. 1983 Oct;20(4):449-57
references: 16725860
references: J Endocrinol. 1996 Jan;148(1):1-9
references: 8568455
references: Gen Comp Endocrinol. 1983 Nov;52(2):255-64
references: 6228485
references: Reprod Nutr Dev. 1984;24(3):281-96
references: 6729240
references: Dev Biol. 1975 Jun;44(2):394-436
references: 805734
references: J Androl. 2003 May-Jun;24(3):401-7
references: 12721217
references: Mol Endocrinol. 1994 Jun;8(6):665-73
references: 7935482
references: Theriogenology. 2003 Apr 1;59(7):1487-502
references: 12559454
references: Curr Top Dev Biol. 1996;33:61-102
references: 9138909
references: Gen Comp Endocrinol. 1984 Jul;55(1):1-11
references: 6745626
references: Anim Reprod Sci. 2004 Aug;84(1-2):73-82
references: 15302388
references: Am J Reprod Immunol. 1995 Jul;34(1):35-43
references: 7576129
references: J Reprod Fertil. 1987 Sep;81(1):227-32
references: 3668953
references: Biol Reprod. 1976 Dec;15(5):695-703
references: 1000010
references: Anim Reprod Sci. 2000 Sep 1;62(4):297-307
references: 10924832
references: Biol Reprod. 1986 Feb;34(1):145-58
references: 3006806