Seasonal Changes of Testicular Weight, Sperm Production, Serum Testosterone, and in Vitro Testosterone Release in Korean Ring-Necked Pheasants(Phasianus colchicus karpowi).

Kim, In Shik; Yang, Hee‐Young

doi:10.1292/jvms.63.151

Cited by 22 publications

(22 citation statements)

References 26 publications

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“…Histological and morphometric analyses revealed that gander testes undergo marked structural seasonal changes as it has been described in Bilgoraj goose (Anser anser) and Canadian goose (Branta canadensis) [28,31,32] and other bird species [1,20,25,42]. Interestingly, structural changes in testicular tissue in the sexual reactivation phase remain weakly researched, especially in geese.…”

Section: Discussionmentioning

confidence: 96%

Seasonal changes in the expression of the androgen receptor in the testes of the domestic goose (Anser anser f. domestica)

Leska

Kieżun

Kamińska

et al. 2012

General and Comparative Endocrinology

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Section: Discussionmentioning

confidence: 96%

Seasonal changes in the expression of the androgen receptor in the testes of the domestic goose (Anser anser f. domestica)

Leska

Kieżun

Kamińska

et al. 2012

General and Comparative Endocrinology

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“…Androgens play an important role in avian reproduction, with modifications in plasma androgen levels paralleling changes in the spermatogenic activity of the testes (KIM, YANG, 2001). , analyzing the plasma testosterone levels, reproductive behavior and reproductive cycle of Hylophylax naevioides (Passeriformes), observed that testosterone levels increased at the beginning of spring and remained elevated throughout the reproductive period, but this situation was not observed in the domestic duck.…”

Section: Discussionmentioning

confidence: 99%

Seasonal reproductive cycle and variability in plasma testosterone levels in the domestic duck (Anas platyrhynchos)

et al. 2017

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ABSTRACT:Morphofunctional gonadal alterations constitute an annual cycle in birds during which four phases can be distinguished in the testes based on histological modifications in the seminiferous epithelium, called quiescence, recrudescence, reproduction and regression. The aim of the present investigation was to conduct a morphometric and morphological study of the seminiferous epithelium on the testis of domestic duck and to evaluate the plasma testosterone levels in order to determine the possible presence of a reproductive cycle in the tropical region. The study was conducted on 60 adult domestic ducks (Anas platyrhynchos), where five animals were sacrificed per month and the testes were removed and histologically and morphometrically studied. Blood samples of the five animals were collected monthly in the morning period and the testosterone levels were analyzed. Annual reproductive cycle of the domestic duck presented by four distinct phases, starting with the reproductive phase at the beginning of winter (July) and peak of reproduction in spring (October), accompanied by an increase in tubule seminiferous diameter, epithelium height, weight and testicular volume, followed by a regressive phase at the end of spring (November) and the beginning of summer (December). Testicular quiescence was observed during summer (January and February) and was followed by a phase of spermatogenic recrudescence, which lasted throughout autumn (March to June), corresponding to the longest phase of the cycle. Complete spermiogenesis in terms of spermatozoa maturation and spermiation was observed during the reproductive phase, coinciding with the plasma testosterone peak. At regressive phase an exfoliation of the seminiferous epithelium was observed, accompanied by a great amount of fibrillar collagen. A decrease in tubular seminiferous diameter and epithelium height was observed during testicular quiescence, with predominance of spermatogonia and Sertoli cells and a second plasma testosterone peak was also observed during this phase (January), probably representing the preparation for a gradual return to the spermatogenic process during recrudescence. The latter phase was characterized by gradual recovery of the seminiferous epithelium, accompanied by the increase of spermatogonia, onset of meiosis, and the presence of primary spermatocytes and maturing spermatids. In conclusion the domestic duck presented the testicular cycle divided in four distinct phases in the tropical region with testosterone peaks in the testicular quiescence and reproductive phases.

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“…So far, only the simple histological compositions of testis and the hormonal changes during the reproductive cycle have been described in studies of seasonal breeding avians (Donham, 1979;Dittami, 1981;Degen et al, 1994;Aire, 1997;Malecki et al, 1998;Kim and Yang, 2001). To our knowledge, there are no reports or morphometric studies of testis interstitium during the reproductive cycle in seasonal breeding avians, including the Korean ring-necked pheasant (Kim and Yang, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…The right testes (n = 12 pheasants per month) were removed, weighed, decapsulated, and incubated in Krebs^Ringer bicarbonate bu¡er (pH 7.4, aerated for 10 min) containing 2% glucose and 1000 ng/ml ovine LH (oLH-26, National Institutes of Health, Bethesda, MD, USA) at 378C for 3 h in a shaking water bath at 90 oscillations/min as described previously (Kim and Yang, 2001;Kim et al, , 2002. A similar dose of oLH stimulated maximal testosterone release in testicular incubations of the garden warbler (Bluhm et al, 1991) and the ostrich (Degen et al, 1994).…”

Section: Testosterone Release From the Lh-stimulated Testis In Vitromentioning

confidence: 99%

“…The amount of testosterone in the serum and incubation medium was measured by radioimmunoassay according to a method described previously (Kim and Yang, 2001). Brie£y, testosterone was extracted from the serum (200 ml) and incubation medium (200 ml) with diethyl ether, then evaporated in a freeze dryer and reconstituted in RIA bu¡er; it was then assayed without further puri¢cation.…”

Section: Testosterone Riamentioning

confidence: 99%

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Morphometric Studies on the Testis of Korean Ring-necked Pheasant (Phasianus colchicus karpowi) during the Breeding and Non-breeding Seasons

et al. 2005

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The purpose of this study was to obtain detailed quantitative information on all cell types in the testis interstitium of Korean ring-necked pheasants and to combine these data with changes in the steroidogenic function of the testis during the breeding and non-breeding seasons. For animals collected during the breeding season, their testis weights, sperm production, serum testosterone levels and leuteinizing hormone (LH)-stimulated testosterone secretion were significantly (p < 0.01) increased compared to the non-breeding season. Testes of the pheasants during the non-breeding season displayed a 98% reduction in testis volume that was associated with a decrease in the absolute volume of seminiferous tubules (98% reduction), tubular lumen (100%), interstitium (90%), blood vessels (84%), lymphatic spaces (97%), Leydig cells (79%), mesenchymal cells (51%) and myoid cells (61%) compared to the breeding season. The numbers of Leydig cells, mesenchymal cells and myoid cells per testis in the breeding season were much higher than in the non-breeding season. Although the mean volume of a Leydig cell was 74% lower in the non-breeding season, the mean volumes of myoid and mesenchymal cells remained unchanged. These results demonstrate that there are striking differences in the testicular structure of the Korean ring-necked pheasant during the breeding and non-breeding seasons. Every structural parameter of the Leydig cell was positively correlated with both testosterone serum levels and LH-stimulated testosterone secretion. The correlation of changes in hormonal status with the morphometric alterations of Leydig cells suggests that the Korean-ring necked pheasant may be used as a model to study structure-function relationships in the avian testis.

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Seasonal Changes of Testicular Weight, Sperm Production, Serum Testosterone, and in Vitro Testosterone Release in Korean Ring-Necked Pheasants(Phasianus colchicus karpowi).

Cited by 22 publications

References 26 publications

Seasonal changes in the expression of the androgen receptor in the testes of the domestic goose (Anser anser f. domestica)

Seasonal changes in the expression of the androgen receptor in the testes of the domestic goose (Anser anser f. domestica)

Seasonal reproductive cycle and variability in plasma testosterone levels in the domestic duck (Anas platyrhynchos)

Morphometric Studies on the Testis of Korean Ring-necked Pheasant (Phasianus colchicus karpowi) during the Breeding and Non-breeding Seasons

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