Seasonal variation in the activity of the Leydig cells in Egyptian Nubian goat (Zaraibi) bucks

El-Sayed, Eitedal H.; Barkawi, Ashraf Hesham; Shafie, M. M.; Ashour, G.; Shehata, E. I.

doi:10.1016/j.smallrumres.2006.04.014

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Expression of estrogen help the growth and differentiation for interstitial cells in between seminiferous tubules of testis at the annual reproductive cycle in the Atlantic cod (78) suggested that testosterone in concerned with spermatogenesis associated with general histomorphological changes of leydig cells like presence of the lipoidal contents, cholesterol -positive prior to onset of preproductive season. Leydig cells give rise for new generation of immature interstitial cells at the end breeding season or peroid (9). Lake (10 stated that when the sexual season was approached, the spermatogenic activity in the seminiferous tubules are building up and thse are lipids and cholesterol.as main components of it.…”

Section: Introductionmentioning

confidence: 99%

The effect of different seasons on the seminiferous tubules and leydig cells of the testis for the adult rabbit of the local breed (Histological study)

Thamer¹

2023

Tikrit J. Pure Sci.

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The season is an important factor determine the efficacy of the sexual activity of the adult males of different animal species, in this study, Sixteen adult male rabbit of local breed were used to investigate the effect of the different seasons of the year on the histology of the testicular tissue, particularly the leydig cells. Four animals were killed in each season and segments of testes processed by using histological technique. The results were indicated that the seasons winter and summer affect the seminiferous tubules reflected by subpopulation of different germ cells such as spermatogonia, primary and secondary spermatocytes, spermatids and spermatozoa. Leydig cells were atrophied with deeply basophilic nuclei associated with poorly blood capillaries in between, otherwise the seasons spring and autumn effect on the same germ cells and leydig cells, but in this case there was increase in the population of germ cells in the seminiferous tubules and the leydig cells were hypertrophied with the presence of cytoplasmic fat droplets and its nuclei were euochromatic, The blood capillaries in between these cells were abundant, these events indicated the increase activity of testicular tissue in both seasons, the (spring and autumn), While in winter and summer, this phenomena was contra versa. The present study was indicated that the spring and autumn seasons are the best for the progressed activity of the leydig cells and germ cells of the testicular tissue of the adult rabbit than the winter and summer seasons.

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Section: Introductionmentioning

confidence: 99%

The effect of different seasons on the seminiferous tubules and leydig cells of the testis for the adult rabbit of the local breed (Histological study)

Thamer¹

2023

Tikrit J. Pure Sci.

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Influence of season and climatic variables on testicular cytology, semen quality and melatonin concentrations in crossbred bucks reared under subtropical climate

et al. 2018

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Seasonality in reproduction and effects of climatic variables on testicular cytology and semen quality in bucks reared under subtropical climatic conditions were not well understood. In the present study, using testicular cytology, semen evaluation and melatonin concentrations assessed over a period of 1 year, we report that bucks reared under subtropical climatic conditions did not show seasonality in reproduction. Climatic variables including temperature, relative humidity, temperature-humidity index (THI), sunshine hours and day length were recorded daily during the whole period of experimentation (one complete year). Ejaculates were collected from crossbred (Alpine X Beetal) males (n = 6) biweekly using artificial vagina, and semen quality (volume, mass activity, sperm concentration, motility, viability, membrane integrity and protamine deficiency) was assessed. To understand the seasonal influence at testicular level, using fine needle aspiration biopsy method, testicular cells were aspirated and different types of cells and testicular cytology indices were quantified. Blood was collected biweekly for estimation of melatonin concentrations. Mass activity was higher (P < 0.05) during rainy season while individual sperm motility and sperm concentration were higher (P < 0.05) during rainy and autumn seasons as compared to other seasons. Sperm functional parameters did not show any differences during different seasons. Sertoli cell count, spermatogenic cell count and testicular indices did not differ among the seasons. Melatonin concentrations also did not differ significantly among the four seasons studied. Among the climatic parameters, THI had significant (P < 0.05) influence on sperm quality. The proportion of Sertoli cell in the testicular cytology had a significant and positive relationship with RH, THI and day length. It was concluded that seasonal variations are less evident in terms of spermatogenesis and semen quality in Alpine X Beetal crossbred bucks reared under subtropical climatic conditions.

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Switching photo-stimulated males between groups of goats does not improve the reproductive response during the male effect

Loya-Carrera

Bedos

Ponce-Covarrubias

et al. 2014

Animal Reproduction Science

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Seasonal variation in the activity of the Leydig cells in Egyptian Nubian goat (Zaraibi) bucks

Cited by 4 publications

References 7 publications

The effect of different seasons on the seminiferous tubules and leydig cells of the testis for the adult rabbit of the local breed (Histological study)

The effect of different seasons on the seminiferous tubules and leydig cells of the testis for the adult rabbit of the local breed (Histological study)

Influence of season and climatic variables on testicular cytology, semen quality and melatonin concentrations in crossbred bucks reared under subtropical climate

Switching photo-stimulated males between groups of goats does not improve the reproductive response during the male effect

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