Cat, cougar, and jaguar spermatogenesis: a comparative analysis

Paula, Tarcízio Antônio Rêgo de; Matta, S. L. P.

doi:10.1590/s1516-89132006000600006

Cited by 11 publications

(10 citation statements)

References 21 publications

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“…The four basic stages of spermatogenesis, namely spermatogonia, spermatocytes, spermatids and spermatozoa, identified at ultrastructural level in the leopard testes have been reported by Russell et al (1990) for most mammalian species. Many other stages occur in between these four stages that could not be easily identified (Russell et al, 1990;Costa, Paula, & Pinto De Matta, 2006;Wistuba et al, 2007;Hess & de Franca, 2009).…”

Section: Discussionmentioning

confidence: 99%

Morphology and ultrastructure of the testes and spermatozoa of the South African leopard (Panthera pardus)

Neves

Wagenaar

2018

Acta Zoologica

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The survival of South African leopard (Panthera pardus) populations is at risk due to the decrease in natural habitat caused by increasing human populations, development projects and industry. The use of ex situ conservation methods such as assisted reproductive techniques (ARTs) in captive breeding programmes can be used to conserve and protect this species. However, a good understanding of the reproductive system of the species is imperative in the development of successful ARTs. This study serves to provide information on the morphology and ultrastructure of the spermatozoa and testes of P. pardus that can be used to help in the development, testing and optimization of reproductive techniques. The objectives of this study were (i) to assess the morphology and ultrastructure of the spermatozoa by means of fluorescence and electron microscopy respectively, and (ii) to examine the morphology and ultrastructure of the testicular tissue as well as of the stages of spermatogenesis using light and electron microscopy. In this study, it was noted that the morphology and ultrastructure of the spermatozoa are similar to those reported in other feline and mammalian species and that a high amount of morphologically abnormal ejaculated sperm was found to be a common occurrence in all samples obtained.

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Section: Discussionmentioning

confidence: 99%

Morphology and ultrastructure of the testes and spermatozoa of the South African leopard (Panthera pardus)

Neves

Wagenaar

2018

Acta Zoologica

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“…The gonadosomatic index was only approximately 0.02% in mature males. The gonadosomatic index has been reported to be 0.08% in the domestic cat and 0.03% in the cougar and jaguar, the two latter species being larger than the lynx (Franc¸a and Godinho 2003;Costa et al 2006). Although large species often have a smaller relationship between testes volume and body weight, the relationship between body weight and testes size seems to be smaller for the lynx than for large feline species.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Reproductive Maturation in the Male Eurasian Lynx (Lynx lynx): A Study on 55 Reproductive Organs Collected from Carcasses During 2002–2005

Axnér

Uhlhorn

Ågren

et al. 2009

Reprod Domestic Animals

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Data on reproductive physiology from the Eurasian lynx (Lynx lynx) are still scarce. The lynx is protected under Swedish hunting legislation. All lynx that are found dead or that are culled at hunting are to be sent to the Swedish National Veterinary Institute. In this study, we examined reproductive organs from 55 male lynx collected during the years 2002-2005. Age, body weight, testicular weight and volume, production of spermatozoa, and sperm viability were evaluated. The majority of the animals (39) had been killed in February and March, which is during the hunting season. The ages varied between 6 months and 17 years, body weight between 3.6 and 25.5 kg, and mean testes weight between 0.16 and 3.16 g. The gonadosomatic index was low compared with other species (approximately 0.02% in mature males). Mean testes weight differed significantly between males <12 months of age and all other age groups but did not differ between males of 18-23 months and older males. Spermatozoa could be collected but had lost most of their viability. Seven of 10 males of 18-23 months were fertile, as defined by the production of spermatozoa while no males < or =15 months of age were fertile. Adherence of the prepuce to the penis and absence of penile spines were associated with immaturity. The results indicate that most males are fertile during the reproductive season of their second year.

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“…The GSI obtained was similar to that previously registered for the species in an area of Atlantic forest (0.54%; [16]), and higher than that found in other bat species, such as the frugivore Sturnira lilium (0.27%; [17]) and in the insectivore Molossus molossus (0.47%; [24]). Its GSI reflects a greater investment in testicular mass in individuals of the order Chiroptera when compared to other mammalian orders, which is consistent with the need for maintenance of the harem, since polygyny being the social organization commonly found among bats [25][26][27].…”

Section: Biometry and Morphometry Of Seminiferous Tubulesmentioning

confidence: 77%

Seasonal evaluation of spermatogenesis of the hematophagous bat Desmodus rotundus in the Caatinga biome

et al. 2020

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This study was aimed to characterize the spermatogenic process and its seasonal variation in Desmodus rotundus, in the Caatinga biome, a water-limited ecosystem, with marked water restriction during most of the year. Collections of adult animals were performed during the dry and rainy seasons, and after euthanasia, their testes were processed histologically to perform morphological, morphometric, ultrastructural and immunohistochemical analyzes. The percentage of seminiferous epithelium, number of Leydig cells per gram of testis, and population of Sertoli cells and A-type spermatogonia presented by D. rotundus were significantly higher in the rainy season, while the percentage of lumen, mitotic index, support capacity performed by Sertoli cells, and overall yield of spermatogenesis were higher in the dry season. The ultrastructure of spermatogenesis was similar to that described in other mammals, and the immunohistochemical analysis revealed activity of the aromatase enzyme in Sertoli cells, Leydig cells, spermatocytes and spermatids, as well as the presence of androgen receptors in Sertoli cells and Leydig cells. FGF2 activity was detected in primary spermatocytes in zygotene and pachytene, as well as secondary spermatocytes and rounded and elongated spermatids, while the BCL-2 protein was expressed in primary spermatocytes in zygotene and pachytene, secondary spermatocytes, and rounded spermatids. The activity of these molecules was similar in both seasons, and associated with the morphometric findings, indicates maintenance in the integrity of the seminiferous epithelium throughout the year. The seasonal study of D. rotundus spermatogenesis indicates a continuous spermatogenesis pattern and suggests a greater production of spermatozoa in the rainy season in the Caatinga biome.

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Cat, cougar, and jaguar spermatogenesis: a comparative analysis

Cited by 11 publications

References 21 publications

Morphology and ultrastructure of the testes and spermatozoa of the South African leopard (Panthera pardus)

Morphology and ultrastructure of the testes and spermatozoa of the South African leopard (Panthera pardus)

Reproductive Maturation in the Male Eurasian Lynx (Lynx lynx): A Study on 55 Reproductive Organs Collected from Carcasses During 2002–2005

Seasonal evaluation of spermatogenesis of the hematophagous bat Desmodus rotundus in the Caatinga biome

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