Annual testicular activity in the gray partridge (Perdix perdix L.)

Fraissinet, Maurizio; Varriale, Bruno; Pierantoni, Riccardo; Caliendo, Marco; Matteo, Loredana Di; Bottoni, L.; Milone, M.

doi:10.1016/0016-6480(87)90056-6

Cited by 9 publications

(10 citation statements)

References 8 publications

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“…the pattern of hormone secretion was not markedly dissimilar to geese [6], mallards [7], songbirds [29], and gray partridges [9]. In female Korean ring-necked pheasants, egg laying starts in April and ends in July, with a peak activity in May-June [12].…”

Section: Discussionmentioning

confidence: 97%

“…In several seasonal breeders [1,8,9] it has been shown that a different seasonal responsiveness of the gonads to gonadotropin stimulation plays a role in determining steroid profiles. In the present study, analysis of the testosterone production by testicular fragments indicates seasonal variations in their response to oLH stimulation.…”

Section: Discussionmentioning

confidence: 99%

“…However, in several seasonal breeders [1,8,9] it has also been shown that a different seasonal responsiveness of the gonads to gonadotropin stimulation plays a role in determining steroid profiles. In the present study, an ovine gonadotropin preparation was used to stimulate the pheasant testes, because ovine LH has been shown to possess a high specificity in androgen stimulation, similar to that shown by bird LH [11].…”

mentioning

confidence: 99%

“…Androgens are known to play an important role in male avian reproduction and many studies have described seasonal variations in plasma testosterone levels in birds such as penguins [30], mallards [7], gray partridges [9], ostriches [5], geese [6], Indian rose-ringed parakeets [14], and wild songbirds [29]. In many birds, it has been reported that testosterone levels changed in parallel with spermatogenic activity in the testis [8].…”

mentioning

confidence: 99%

“…Many avian species exhibit annual reproductive cycles and cyclic variations in reproductive hormones that are associated with structural changes in the testis and the changing patterns of spermatogenic cells [8,9] LH is the primary steroidogenic hormone acting on the testicular cells; therefore androgen production is controlled by the cyclic hypophyseal activity [2,28]. However, in several seasonal breeders [1,8,9] it has also been shown that a different seasonal responsiveness of the gonads to gonadotropin stimulation plays a role in determining steroid profiles.…”

mentioning

confidence: 99%

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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).

Kim

Yang

2001

The Journal of Veterinary Medical Science

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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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).

Kim

Yang

2001

The Journal of Veterinary Medical Science

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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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