B-Mode ultrasonographic evaluation of the testis in relation to serum testosterone concentration in male Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) during the breeding season

Wu, Haiping; Hao, Yiming; Li, X.; Zhao, Qingzhong; Chen, D.-Q.; Kuang, Xin; Kou, Z.-B.; Feng, K.-K.; Gong, Wei; Wang, D.

doi:10.1016/j.theriogenology.2009.09.022

Cited by 13 publications

(8 citation statements)

References 20 publications

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“…However, the available maximum width of the ultrasonographic field of view was only 10 cm, much shorter than the testis length in mature males. Therefore, testis length was measured using the "indirect measurement method" described by Brook et al and Wu et al [25,26]. At the widest part of the testis, the transducer was rotated 90°to produce a cross-sectional image.…”

Section: Testis Ultrasonographymentioning

confidence: 99%

Variation in sexual behaviors in a group of captive male Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis): motivated by physiological changes?

Hao

et al. 2010

Theriogenology

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Section: Testis Ultrasonographymentioning

confidence: 99%

Variation in sexual behaviors in a group of captive male Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis): motivated by physiological changes?

Hao

et al. 2010

Theriogenology

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“…2010). Wu et al. (2010) demonstrated that pixel intensity is closely correlated with serum testosterone concentration and with the reproductive status, and according to Ulker et al.…”

Section: Introductionmentioning

confidence: 98%

Testicular Fluid Content Evaluated by Ultrasound Image Computer‐Assisted Analysis Increases with Small‐Dose Multiple GnRH Injections in Rams

Ungerfeld¹,

Fila²

2010

Reprod Domestic Animals

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The aim of the work was to determine whether multiple small doses of GnRH induce an increase in testicular blood flow and scrotal temperature in rams. The experiment was performed during the late breeding season (May-June) with 14 one-year-old rams. Seven rams received hourly doses of 7 ng of a GnRH analogue (busereline acetate) iv starting at 8:00 on the morning, and the other seven rams remained as controls. One week later, treatments were overcrossed. One hour before the first GnRH dose (7:00), and 0, 1, 2, 4, 7 and 10 h later, ultrasonographic examinations of the testes were performed with a B-mode ultrasound scanner with a 7.5 MHz linear array transducer. Each testicle was examined separately by placing the transducer vertically. Images were analysed with specific software using the spot metering technique in four spots with a diameter of 1 cm on the same place of the image. At the same times, rectal, anal and scrotal surface temperatures were measured with a laser thermometer. Pixel intensity was lower with time (blacker, p < 0.0001), as a consequence of GnRH treatment (p < 0.0001). Differences between pixel intensities were significant starting 1 h after the first GnRH dose (p < 0.0001). Perineal temperature (33.9 ± 0.2°C) was not affected by treatment or time (p > 0.1). Rectal temperature was similar in both groups (p < 0.05) until 4 h after the beginning of the treatment (13:00 h). The differences between treatments increased since 4 h after the first dose of GnRH. Scrotal surface temperatures were not affected by treatment (p > 0.1). We concluded that multiple small GnRH doses trigger a rapid increase in testicular fluid content not accompanied by changes on scrotal surface temperature.

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“…As we demonstrated, this index did not vary throughout the year and evidence of SSK activity was only obtained after histological examination. The absence of noteworthy differences between active spermatogenesis and testicular regressed groups removes KSI as a useful parameter for noninvasive evaluation of sexual segment development during the reproductive season, as has been proposed for reproductive organs in other species (Banzato et al, 2012; Pease et al, 2010; Robeck et al, 2009; Wu et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

The sexual segment of the kidney of a tropical rattlesnake, Crotalus durissus (Reptilia, Squamata, Viperidae), and its relationship to seasonal testicular and androgen cycles

Resende

Avelar

2021

Journal of Morphology

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The sexual segment of the kidney (SSK) is a hypertrophied region of the nephron, which occurs in males of most squamate species that have been investigated, at least, during the active season. Many studies have shown that the SSK has a seasonal secretory cycle that could be correlated to the mating season, testicular activity, and androgen synthesis. However, to date, no study has investigated the presence of androgen receptors (AR) in cells of the SSK, nor the relation between the expression of AR, testosterone levels, and testicular condition. The SSK in Crotalus durissus corresponds to the distal segment of the nephron and presents a peak of hypertrophy during the period of testicular activity (spermatogenesis) and high testosterone levels, suggesting that seasonal variation of the SSK might be under the control of androgens. Testosterone concentrations and expression of AR varied seasonally with increased values for both parameters directly correlated to hypertrophy of the SSK. This study is, therefore, the first to target the SSK of a tropical snake and to establish a relationship between the secretory cycle of the SSK, testicular cycle, and levels of androgens. Furthermore, this study is the first to identify the presence of AR in the nucleus of the SSK cells.

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B-Mode ultrasonographic evaluation of the testis in relation to serum testosterone concentration in male Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) during the breeding season

Cited by 13 publications

References 20 publications

Variation in sexual behaviors in a group of captive male Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis): motivated by physiological changes?

Variation in sexual behaviors in a group of captive male Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis): motivated by physiological changes?

Testicular Fluid Content Evaluated by Ultrasound Image Computer‐Assisted Analysis Increases with Small‐Dose Multiple GnRH Injections in Rams

The sexual segment of the kidney of a tropical rattlesnake, Crotalus durissus (Reptilia, Squamata, Viperidae), and its relationship to seasonal testicular and androgen cycles

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