The seminiferous epithelium cycle and its duration in different breeds of dog (<i>Canis familiaris</i>)

Soares, José Francisco; Avelar, Gleide Fernandes de; França, Luiz R.

doi:10.1111/j.1469-7580.2009.01122.x

Cited by 41 publications

(53 citation statements)

References 25 publications

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“…Similarly, the total duration of spermatogenesis in S. lilium (15.52 days) was far below the average previously recorded for mammals, ranging from 30 to 75 days (França & Russell, ; Leal & França, ; Hess & França, ; Soares et al. ).…”

Section: Discussionmentioning

confidence: 55%

Stages and duration of the seminiferous epithelium cycle in the bat Sturnira lilium

et al. 2013

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Knowledge of the stages that compose the seminiferous epithelium cycle (SEC) and determination of the duration of spermatogenic processes are fundamental for the accurate quantification of the dynamics of spermatogenesis. The aim of this study was to characterize the stages that compose the SEC of the bat Sturnira lilium, including evaluation of the average frequency of each of these stages throughout the year and calculation of the duration of the spermatogenic process. An ultrastructural characterization of the formation of the acrosomal cap was also performed. Testicular fragments were processed for morphological and immunohistochemical analysis as well as ultrastructural analysis using transmission electron microscopy. According to the tubular morphology method, the SEC in S. lilium is divided into eight stages, following the pattern found in other mammals. Primary spermatocytes were found at zygotene in stage 1 of the cycle. There was no variation in frequency of each of the stages over the seasons, with stage 1 being the most frequent, and stage 7 the least frequent. The duration of one seminiferous epithelium cycle was 3.45 days, and approximately 15.52 days were required for the development of sperm from spermatogonia. Ultrastructural characterization allowed the formation of the acrosomal cap in round spermatids to be monitored. In conclusion, the stages that compose the SEC in S. lilium are generally similar to those described for other mammals, but the duration of the spermatogenic process is shorter than previously recorded for mammals. The presence of primary spermatocytes at zygotene in stage 1 of the cycle is probably due to the longer duration of this stage.

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Section: Discussionmentioning

confidence: 55%

Stages and duration of the seminiferous epithelium cycle in the bat Sturnira lilium

et al. 2013

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“…() investigated semen quality 60 days after ultrasound examination; an interval spanning one spermatogenic cycle length. It is plausible that in the present study, the method of calculating mean semen quality throughout the 6‐month monitoring period (spanning 1–3 spermatogenic cycles [Soares, Avelar, & França, ]) masked subtle changes in semen quality, although semen quality did decline in 26 of the 55 dogs across the two studies.…”

Section: Discussionmentioning

confidence: 82%

Canine reproductive ultrasound examination for predicting future sperm quality

England

Bright

Pritchard

et al. 2016

Reprod Domestic Animals

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ContentsThe reproductive potential of male animals is commonly evaluated using a breeding soundness examination incorporating B-mode ultrasound examination of the testes and recently Doppler ultrasound examination of the testicular arteries. These techniques may detect testicular normality or pathology, and while some measured parameters are associated with semen quality at the time of ultrasound examination, few studies have investigated the relationship with future semen quality. We hypothesized that B-mode and Doppler ultrasound measurements would correlate with future semen quality. Within two studies, we investigated the relationship between ultrasound measured testicular volume, testicular echogenicity, testicular homogeneity, subjective assessment of the testicular parenchyma, testicular artery resistance index, and pulsatility index with subsequent semen quality. Fifty-five normal fertile dogs of which 29 had stable semen quality and 26 had a subsequent decline in semen quality were examined during a 6-month period commencing 62 days after the ultrasound examination.Statistical analysis showed that no ultrasound parameters were predictive of future total sperm output or percentage live normal sperm. However, mean testicular echogenicity was positively related to future sperm motility (t = 2.202, p = .039). We conclude that quantitative ultrasound assessment of the appearance of the testicular parenchyma has potential for the evaluation of future semen quality in dogs.

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“…In respect to breeds, Soares et al (2009) studied seminiferous epithelium cycle in different breeds of dogs, and they did not find any differences on the total number of stages, duration of spermatogenesis and seminiferous epithelium cycle length among breeds. In the current study, it was further noted that the gene expression of a single RA signalling molecule within the test group was statistically similar.…”

Section: Discussionmentioning

confidence: 97%

Expression of CYP26b1 and Related Retinoic Acid Signalling Molecules in Young, Peripubertal and Adult Dog Testis

Kasimanickam

2012

Reprod Domestic Animals

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Contents The objective of the study was to elucidate mRNA expression of CYP26b1 (cytochrome P450, family 26, subfamily B, polypeptide 1) and signalling molecules ALDH1 (aldehyde dehydrogenase 1), CRABPII (cellular retinoic acid‐binding protein II), RARα (retinoic acid receptor alpha) and STRA8 (stimulated by retinoic acid gene 8) in dog testis from different post‐natal developmental ages. Testicular tissue samples were collected from medium‐sized mixed breed dogs at different ages such as young (<4 months; N = 4), peripubertal (4–8 months; N = 3) and adult (>8 months; N = 4) were used to evaluate relative mRNA expression. Genes of RA‐degrading enzyme CYP26b1, ALDH1 involved in RA synthesis and genes of carrier protein CRABPII involved in RA metabolism were turned on during the post‐natal testicular development in dogs. Their expression pattern differs at different developmental ages (p < 0.05), and the levels of mRNA expression were compensated towards a normal developmental response for the sexual maturity and continuous spermatogenesis. The mRNA expression of RARα, one of the RA receptors participates in RA signalling in connection to spermatogenesis, was recorded in young and adult stages at varying degree. STRA8 is one of the responsive genes with regard to meiosis, and this functional gene product was expressed in all ages with the changing level (p < 0.01). In summary, the expression pattern of RA signalling molecules differed from young to adult ages, and it is expected that these changes are to compensate towards a normal developmental response for the sexual maturity and continuous spermatogenesis.

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The seminiferous epithelium cycle and its duration in different breeds of dog (Canis familiaris)

Cited by 41 publications

References 25 publications

Stages and duration of the seminiferous epithelium cycle in the bat Sturnira lilium

Stages and duration of the seminiferous epithelium cycle in the bat Sturnira lilium

Canine reproductive ultrasound examination for predicting future sperm quality

Expression of CYP26b1 and Related Retinoic Acid Signalling Molecules in Young, Peripubertal and Adult Dog Testis

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