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Testis Volume (testis + volume)
Selected AbstractsCo-evolution of male and female reproductive traits across the Bruchidae (Coleoptera)FUNCTIONAL ECOLOGY, Issue 5 2008P. F. Rugman-Jones Summary 1Despite the obvious importance of spermatozoa to individual reproductive success a general explanation of variation in spermatozoan form and function is still lacking. In species with internal fertilization, sperm not only have to interact with the physical and biochemical environment of the female reproductive tract, but frequently face competition from the sperm of rival males. Both sperm competition theory and adaptation to the selective environment of the female reproductive tract have been implicated in the evolution of spermatozoan morphological diversity. 2Using the comparative method, we examine variation in sperm length in relation to (i) sperm competition intensity (as measured by relative testis size) and (ii) female reproductive characters, across 15 species of beetle belonging to the family Bruchidae. 3Stepwise multiple regression within a phylogenetic framework revealed sperm length to be positively correlated with female spermathecal duct length and negatively related to spermathecal volume, but not testes size, indicating that the female reproductive environment rather than sperm competition per se exerts selection on sperm length in this taxonomic group. 4A positive association between testes volume and the volume of the female spermatheca was also evident suggesting correlated evolution of these traits. 5A number of models of sexual selection could lead to the correlated evolution of male and female reproductive characters, although the underlying mechanisms of cause and effect remain elusive. Divergence between species (and populations) in primary reproductive traits is likely to present a significant barrier to hetero-specific fertilization, and thus contribute to reproductive isolation. [source] Effects of radio-collars on European badgers (Meles meles)JOURNAL OF ZOOLOGY, Issue 1 2002F. A. M. Tuyttens Abstract The relationships between radio-collaring/tracking and 12 biometric parameters in a population of badgers (Meles meles) that were live-trapped in south-west England were investigated. The length of time for which a badger had worn a radio-collar was selected as an explanatory variable in generalized linear models of three biometric parameters (body condition, body weight and testes volume) irrespective of whether or not age class was included as a variable in the analyses. There was evidence that badgers that had been carrying a radio-collar for 1,100 days had lower body condition scores both when compared to badgers that had not been collared and with those that had been collared for longer than 100 days, suggesting a post-collaring acclimation period. In addition, the time period between first and last capture was longer for radio-collared than non-collared badgers. It is unlikely that this was due to an effect of collaring on trappability or to non-random selection of badgers for collaring. Although testes size differed between non-collared badgers and badgers that had been tagged for > 100 days, the relationship between radio-collaring and reproductive output remained unproven. These results highlight not only the need to assess the welfare aspects of radio-collaring but also the potential intricacy of corollaries of collaring. Explorations such as that reported here are important to the validity of studies that make use of radio-telemetry. [source] Hysterical Traits Are Not from the Uterus but from the Testis: A Study in Men with Sexual DysfunctionTHE JOURNAL OF SEXUAL MEDICINE, Issue 8 2009Elisa Bandini MD ABSTRACT Introduction., The relationship between testosterone (T) and psychopathology in subjects with sexual dysfunction has not been completely clarified. Aim., To evaluate the association between T levels and different psychopathological symptoms and traits in men seeking treatment for sexual dysfunction. Methods., A consecutive series of 2,042 heterosexual male patients (mean age 51.8 ± 13) consulting an outpatient clinic for sexual dysfunction was retrospectively studied. Main Outcome Measures., Several hormonal, biochemical, and instrumental parameters were investigated, including testis volume (Prader orchidometr) and penile blood flow (penile Doppler ultrasound). Patients were interviewed, prior to the beginning of any treatment, with the previously validated Structured Interview on Erectile Dysfunction (SIEDY), and ANDROTEST (a structured interview for the screening of hypogonadism in patients with sexual dysfunction). They also completed the Middlesex Hospital Questionnaire (MHQ) a brief self-reported questionnaire for the screening of the symptoms of mental disorders in nonpsychiatric setting. Results., T levels showed a negative correlation with depressive and anxiety (somatized and phobic) symptoms. Conversely, histrionic/hysterical traits were strongly and positively associated with elevated T. Men with histrionic/hysterical traits had higher androgenization, as suggested by both higher total and free T, higher testis volume and a lower ANDROTEST score. They were also characterized by better self-reported sexual functioning and penile blood flow. Accordingly, when SIEDY scales were considered, SIEDY scale 2 (relational domain) was significantly lower in subjects with histrionic/hysterical traits further indicating a more satisfying sexual relationship. Conclusions., In men consulting for sexual dysfunction, histrionic/hysterical personality is associated with higher androgenization and better sexual functioning. Hysteria, previously considered as a typically feminine psychopathological trait (the uterine theory), should now be considered as an index of better masculine sexual well-being. Bandini E, Corona G, Ricca V, Fisher AD, Lotti F, Sforza A, Faravelli C, Forti G, Mannucci E, and Maggi M. Hysterical traits are not from the uterus but from the testis: A study in men with sexual dysfunction. J Sex Med 2009;6:2321,2331. [source] ORIGINAL RESEARCH,ENDOCRINOLOGY: ANDROTEST©: A Structured Interview for the Screening of Hypogonadism in Patients with Sexual DysfunctionTHE JOURNAL OF SEXUAL MEDICINE, Issue 4 2006Giovanni Corona MD ABSTRACT Introduction., Detecting hypogonadism, which is important in the general population, becomes crucial in patients with sexual dysfunctions, because hypogonadism can have a causal role for them and testosterone (T) substitution represents a milestone for the therapy. Aim., No inventories are available for the screening of hypogonadism in patients with sexual dysfunction. We wished to set up a brief structured interview providing scores useful for detecting hypogonadism defined as low total T (<10.4 nmol/L, 300 ng/dL) in a symptomatic population (sexual dysfunction). Methods., A minimum set of items was identified within a larger structured interview through iterative receiver-operating characteristic curve analysis, with assessment of sensitivity and specificity for hypogonadism in a sample of 215 patients. Main Outcome Measures., Sensitivity and specificity were verified in a further sample of 664 patients. Correlation of test scores with prostate-specific antigen (PSA), testis volume, and others clinical and psychological parameters, was assessed for concurrent validity. Results., In the validation sample, the final 12-item version of the interview (ANDROTEST,©) had a sensitivity and specificity of 68% and 65%, in detecting low total T (<10.4 nmol/L) and of 71% and 65%, in the screening for low free T (<37 pmol/L). Furthermore, patients with a pathological test (i.e., score >8) showed higher prevalence of hypogonadism-related signs, such as lower testis volume and higher depressive symptoms. Finally, when only younger patients (<54 years, which represents the median age of the sample) were considered, Log10 [PSA] levels were significantly lower in those with ANDROTEST,© score >8. Conclusion., ANDROTEST,© is a quick and easy-to-administer interview that provides scores for the screening of male hypogonadism in patients with sexual dysfunction. Corona G, Mannucci E, Petrone L, Balercia G, Fisher AD, Chiarini V, Forti G, and Maggi M. ANDROTEST,©: A structured interview for the screening of hypogonadism in patients with sexual dysfunction. J Sex Med 2006;3:706,715. [source] | ||||||||||