Daily sperm production of zebus () estimated by quantitative histology of the testis

Cardoso, F.M.; Godinho, Hugo Pereira

doi:10.1016/0093-691x(85)90001-9

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…The diameter of the seminiferous tubules of the sham-operated testes compared well with data from other authors (Krishnalingam et al, 1982;Wildeus & Entwistle, 1983;Cardoso & Godhino, 1985). The mean diameter of the tubules of the experimental testes was significantly smaller than that of the sham-operated testes.…”

Section: Discussionsupporting

confidence: 80%

Effect of surgical restriction of growth of the testicular artery on testis size and histology in bulls

Kay¹,

Grobbelaar²,

Hattingh³

1992

Reproduction

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The growth of the testicular artery was restricted on one side in young bulls and subsequent testicular development was monitored. After the animals had been killed, the testes were studied histologically and compared with testes from hypoplastic bulls. The growth rate of testes from the experimental side was significantly lower than that of testes from the sham-operated side over a period of 578 days. At death, the experimental testes had a mean (+/- SD) mass of 76 (+/- 41) g compared with 220 (+/- 31) g for the control testes. The sham-operated testes accounted for 0.071 (+/- 0.008)% of live body mass compared with 0.025 (+/- 0.014)% for the experimental testes. The seminiferous tubules in the sham-operated testes had a mean diameter (+/- SD) of 211 (+/- 25) microns, whereas those of the artery-restricted testes and hypoplastic testes were significantly smaller (152 (+/- 37) and 145 (+/- 45) microns, respectively). In the artery-restricted and hypoplastic testes, the interstitial tissue accounted for a significantly greater proportion of the testicular tissue than in the sham-operated testes and spermatogenesis was either totally absent or present in only a small proportion of tubules. It is suggested that the artery-restricted testes could be used as a model for testicular hypoplasia.

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Section: Discussionsupporting

confidence: 80%

Effect of surgical restriction of growth of the testicular artery on testis size and histology in bulls

Kay¹,

Grobbelaar²,

Hattingh³

1992

Reproduction

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“…The higher rates of cellular losses occur during spermatogonial mitosis, reaching from 72 to 79% in bovines, followed by losses during the final phases of meiotic divisions, generally around 25%, obtaining total cellular losses during spermatogenesis of 78–79% in bovines. During meiotic prophase and spermiogenesis, no important losses were seen (Amann, ; Berndtson and Desjardins, ; Cardoso and Godinho, ). Therefore, it is clear that the values obtained in this study were compatible to previous studies.…”

Section: Discussionmentioning

confidence: 99%

Efficiency of the Spermatogenesis in Zebu Bulls (bos taurus indicus)

Andreussi

Faria

Fernandes³

et al. 2013

Anat Histol Embryol

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The objective of the research was to evaluate the efficiency of the spermatogenesis through the morphology of the testicular parenchyma in bulls of different zebu breeds. We used testicular fragments from bull of the breeds Nelore (n = 10), Polled Nelore (n = 6), Gyr (n = 5), Guzerat (n = 5) and Tabapuã (n = 5). The tissue was perfused with Karnovsky solution, included in glycol methacrylate and stained with toluidine blue-sodium borate 1%. Animals of the Nelore breed presented higher population of primary spermatocyte in pre-leptotene/leptotene (38.30) and in pachytene (38.14) and round spermatids (113.30), higher yield of spermatogonia mitosis (21.2) and higher daily spermatic production per gram of testicular parenchyma (32.8 × 10(6) ) than those from breeds Gyr, Guzerat and Tabapuã and higher general yield of spermatogenesis (62.4) than breeds Gyr and Tabapuã. There was no significant difference in any of the evaluated parameters between breeds Nelore and Polled Nelore. The rate of Sertoli cells did not vary between the studied breeds. Apparently, the genetic selection applied to the breeds has been improving the yield in the spermatogenic process by decreasing cellular loss, although it did not increase the support capacity of the Sertoli cells.

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“…Disruption of spermatogenesis by under-nutrition also seems to involve the pathways of apoptosis 7 , a crucial event in many physiological and pathological conditions 8 that was detected long ago in the seminiferous epithelium and is thought to be an important determinant of sperm output 9 . The efficiency of spermatogenesis depends on the total number of cells at successive stages of spermatogenesis 10 , so is probably regulated by programmed cell death. Indeed, factors that disrupt spermatogenesis can induce apoptosis in the testis – for example, suppression of FSH activity, which reduces Sertoli cell proliferation and germ cell number, leads to loss of germ cells through apoptosis rather than through a decrease in proliferation 11 12 .…”

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confidence: 99%

Roles of small RNAs in the effects of nutrition on apoptosis and spermatogenesis in the adult testis

Guan

Liang

Hawken

et al. 2015

Sci Rep

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We tested whether reductions in spermatozoal quality induced by under-nutrition are associated with increased germ cell apoptosis and disrupted spermatogenesis, and whether these effects are mediated by small RNAs. Groups of 8 male sheep were fed for a 10% increase or 10% decrease in body mass over 65 days. Underfeeding increased the number of apoptotic germ cells (P < 0.05) and increased the expression of apoptosis-related genes (P < 0.05) in testicular tissue. We identified 44 miRNAs and 35 putative piRNAs that were differentially expressed in well-fed and underfed males (FDR < 0.05). Some were related to reproductive system development, apoptosis (miRNAs), and sperm production and quality (piRNAs). Novel-miR-144 (miR-98), was found to target three apoptotic genes (TP53, CASP3, FASL). The proportion of miRNAs as a total of small RNAs was greater in well-fed males than in underfed males (P < 0.05) and was correlated (r = 0.8, P < 0.05) with the proportion of piRNAs in well-fed and underfed males. In conclusion, the reductions in spermatozoal quality induced by under-nutrition are caused, at least partly, by disruptions to Sertoli cell function and increased germ cell apoptosis, mediated by changes in the expression of miRNAs and piRNAs.

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Daily sperm production of zebus () estimated by quantitative histology of the testis

Cited by 13 publications

References 17 publications

Effect of surgical restriction of growth of the testicular artery on testis size and histology in bulls

Effect of surgical restriction of growth of the testicular artery on testis size and histology in bulls

Efficiency of the Spermatogenesis in Zebu Bulls (bos taurus indicus)

Roles of small RNAs in the effects of nutrition on apoptosis and spermatogenesis in the adult testis

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