Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds

Fernandez-Abella, D.; Becú-Villalobos, Damasia; Lacau-Mengido, I.M.; Villegas, N.; Bentancur, O.

doi:10.1051/rnd:19990508

Cited by 13 publications

(9 citation statements)

References 11 publications

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“…There are differences in opinion about the relationship between testicular measurements and spermatological characteristics in rams. While several researchers concluded that there are favourable genetic and phenotypic correlations between semen characteristics and testicular measurements in rams (Rege et al, 2000) others reported no relationship between testicular size and sperm production measured at the same time (Fernandez-Abella et al, 1999). In the present study a significant positive correlations were observed between all testicular measurements with semen volume and motility rate at seven and eight months of age, while no correlation was found from nine to 14 months of age (Table 3).…”

Section: Resultssupporting

confidence: 43%

“…While some researchers suggested that testicular size provided a good index of testicular sperm output in rams (Lino, 1972), others reported that biweekly scrotal measurements were poorly correlated with semen quality in adult rams (Langford et al, 1989). Fernandez et al (1999) did not record a relationship between testicular size and sperm production. In contrast, testicular volume during late spring was correlated with sperm production in autumn.…”

Section: Introductionmentioning

confidence: 97%

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Relationship of testicular development with age, body weight, semen characteristics and testosterone in Kivircik ram lambs

Elmaz¹,

Cirit²,

Demir³

2007

SA J. An. Sci.

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The study was conducted to measure the development of several testicular characteristics and to investigate the relationship between testicular parameters with body growth, semen characteristics and serum testosterone levels in growing ram lambs. Seventeen single born Kivircik ram lambs from three to four year old ewes were used. When the rams were two months old measurements of the length, diameter and circumference of their testes and body weights started, and blood samples were collected at 20-day intervals for the next 12 months. From seven to 14 months of age semen was collected at monthly intervals. There was a gradual and linear increase in testicular dimensions from two to 11 months of age. A rapid increase in all testicular dimensions was observed between 140 to 160 days of age. All measurements of testes, live weight, age and serum testosterone concentrations were positively and significantly correlated with each other. While a significant positive correlation was found at seven and eight months of age between all testicular measurements and semen volume and motility, no such correlations were observed between nine and 14 months of age. From seven to 14 months of age no correlation was measured between serum testosterone concentrations and spermatological characteristics. These results demonstrated that testicular measurements, especially scrotal circumference, can be used as criteria for early selection of ram lambs to be used in breeding at relatively young ages.

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Section: Resultssupporting

confidence: 43%

Section: Introductionmentioning

confidence: 97%

Relationship of testicular development with age, body weight, semen characteristics and testosterone in Kivircik ram lambs

Elmaz¹,

Cirit²,

Demir³

2007

SA J. An. Sci.

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“…However, Fernandez‐Abella et al. () in Uruguay observed that there was no relationship between testicular size determined by orchimetry and sperm production measured at different times of the year in rams varying in the duration of the breeding season (Corriedale and Merino genotypes). In a previous study of sexually mature Santa Iněs rams, scrotal circumference was positively correlated only with sperm motility (Batissaco et al., ).…”

Section: Resultsmentioning

confidence: 99%

Changes in testicular size, echotexture, and arterial blood flow associated with the attainment of puberty in Dorper rams raised in a subtropical climate

Camela

Nociti

Santos

et al. 2018

Reprod Domestic Animals

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There is a paucity of information on the relationships of testicular morphology, echotextural attributes, and blood flow dynamics with pubertal development of rams raised in a subtropical climate. Forty-five Dorper rams (24 rams aged 8-11 months and 21 rams aged 12-24 months) were examined using a portable ultrasound scanner connected to a 7.5-MHz transducer. Computer-assisted analyses of testicular ultrasonograms utilized commercially available Image ProPlus analytical software. Spectral Doppler scans of testicular arteries were performed immediately after scrotal (B-mode) ultrasonography to determine peak systolic velocity (PSV), end-diastolic velocity (EDV), resistive index (RI = [PSV-EDV]/PSV), and pulsatility index (PI = [SPV-EDV]/mean velocity) of the blood vessels. The length of the testes (9.7 ± 0.3 compared with 9.0 ± 0.2 cm) and scrotal circumference (33.3 ± 0.5 compared with 31.8 ± 0.4 cm) were greater (p < 0.05) but testicular depth (4.9 ± 0.08 compared with 4.5 ± 0.1 cm) was less (p < 0.05) in sexually mature compared with peripubertal rams. There were no differences (p > 0.05) between the two age groups of Dorper rams in blood flow indices of testicular arteries. Mean numerical pixel values (100.5 ± 4.1 compared with 89.2 ± 4.8) and pixel heterogeneity (25.6 ± 0.6 compared with 23.6 ± 0.5) of testicular parenchyma were greater (p < 0.05) in peripubertal than in postpubertal rams. Semen volume was negatively correlated with PI of testicular arteries (r = -0.57, p = 0.04). In summary, the attainment of sexual maturity in the rams of the present study was associated with significant changes in testicular length and depth, scrotal circumference, and parenchymal echogenicity/hetrogeneity but not in testicular volume and blood perfusion rates. Testicular artery PI can be used to predict the volume of ejaculate in rams.

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“…Alternatively, Edens and Sefton [6] reported that broiler breeder roosters supplemented with a slightly lower concentration of Se (0.2 mg/kg of diet) regardless of source, had increased relative testes weights compared with a Se-deficient control. However, increased testicular size does not correspond to increased fertility [28] or greater reproductive hormone levels [29] and any identified relationships between these measures are breed-specific in poultry [30].…”

Section: Discussionmentioning

confidence: 91%

Source of Selenium Supplementation Influences Testis Selenium Content and Gene Expression Profiles in Single Comb White Leghorn Roosters

Brennan

Pierce

Cantor

et al. 2011

Biol Trace Elem Res

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Spermatogenesis is a tightly regulated, selenium-dependent process. Nutritional deficiencies, including Se, have been associated with decreased fertility. During Se depletion, testes preferentially retain Se while other tissues are depleted. This study was aimed at evaluating the effect of Se source (inorganic or organic yeast derived) on testes weight, Se content, and gene expression. At 17 weeks of age, roosters were randomly assigned to one of three treatments: basal diet (control), basal diet + 0.3 mg organic Se/kg organic yeast-derived Se (YS; Sel-Plex®, Alltech Inc.), or basal diet + 0.3 mg inorganic Se /kg inorganic Se as sodium selenite (SS). At 40 weeks of age, seven roosters from each treatment were euthanized and testes removed. Testes weight did not differ between treatments, but Se content was greater (P ≤ 0.01) in YS than SS and control. Testicular differential gene expression profiling was accomplished using the Affymetrix Genechip® chicken genome array. Ingenuity® pathway analysis revealed that Se supplementation, regardless of source, results in the up-regulation of genes governing cell structure/morphology. The enrichment of such pathways was greater with YS than SS. These expression patterns suggest that aside from playing a role in antioxidant defense, Se, especially in the organic YS form, is useful for maintaining testicular cell structure.

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Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds

Abstract: -The relationships between testis size, hormone secretion and sperm production were studied during the spring (December) and autumn (May)

Cited by 13 publications

References 11 publications

Relationship of testicular development with age, body weight, semen characteristics and testosterone in Kivircik ram lambs

Relationship of testicular development with age, body weight, semen characteristics and testosterone in Kivircik ram lambs

Changes in testicular size, echotexture, and arterial blood flow associated with the attainment of puberty in Dorper rams raised in a subtropical climate

Source of Selenium Supplementation Influences Testis Selenium Content and Gene Expression Profiles in Single Comb White Leghorn Roosters

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