Abstract
The aim of the present study was to determine the effect of GnRH on the measurements of testes, accessory sex glands and testosterone hormonal concentrations during the non-breeding season. Eight mature healthy Egyptian Baladi male goat injected with Buserelin acetate (GnRH analogue) 8μg once weekly for one month. Ultrasonographic measurements of the scrotum and its contents and all accessory sex gland and blood samples collection were done one week before experiment and one week after the end of experiment. Results revealed that scrotal circumference, length and breadth of both testes did not differ significantly (p>0.05). While, the length and breadth of the tail of epididymis was increased significantly after treatment (p<0.05). The length and breadth of vesicular gland and bulbourethral gland differed significantly (p<0.05) after treatments. The ampulla and pars disseminata of prostate breadth was increased significantly (p<0.05). Treated bucks showed higher values for serum testosterone after treatment. In conclusion, the present results demonstrated that GnRH injection ameliorates male goat reproductive efficiency. Moreover, ultrasonography is an affirmative indicator to the response of male reproductive system to exogenous GnRH analogue treatment during the non-breeding season.
Highlights
Male reproductive efficiency may be enhanced by melatonin treatment (Rosa et al, 2000), or by applying artificial lighting regimes (Delgadillo et al, 2004).The eCG injections stimulate testosterone secretion and testicular activity in rams (Hochereau-De et al, 1990; Price et al, 1991)
Long-term treatment of Gonadotropin releasing hormone (GnRH) at lower doses had a stimulatory effect on the pituitary gland and indirectly affects gonadal function but in large doses have a depressive effect on prostate, testis and vesicular glands (Warner et al, 1983)
Accessory sex glands viewed in Egyptian Baladi bucks after GnRH analogue in the current study revealed a significant difference in length and breadth measurements of after treatment
Summary
Male reproductive efficiency may be enhanced by melatonin treatment (Rosa et al, 2000), or by applying artificial lighting regimes (Delgadillo et al, 2004).The eCG injections stimulate testosterone secretion and testicular activity in rams (Hochereau-De et al, 1990; Price et al, 1991). There was a strong relation between testis volume and serum testosterone concentration after injection of GnRH in male animals (Schanbacher and Lunstra, 1977; Anderson, 1992; Gabor et al, 1995). The non-breeding season can affect the reproductive pattern of rams desire, sexual activity, androgen concentration, testicular volume and semen parameters (Avdi et al, 2004; Dufour et al, 1984; Gündogan, 2007). Testicular measuraments can be changed by photoperiod, Season, temperature and relative humidity
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