Radiographic pelvimetry in the Tamandua tetradactyla

Abstract

The pelvis, formed by the ilium, ischium and pubis, forms the coxal, which is the largest of the flat bones of the skeleton, with an important role in the physiology of birth. Vastly studied in domestic animals, there is still much to be investigated regarding the anatomical classification in wild animals, mainly aiming to improve the understanding of the reproductive management of the species. Tamandua tetradactyla is one of these species in which morphological studies are still scarce, especially when it comes to reproductive aspects. In this context, we carried out the pelvimetry of T. tetradactyla using radiographic images to anatomically and obstetrically classify the pelvis of this species, classifying it as dolicopelvic, with evidence of homoscedasticity of the samples. Verification of the existence of a relationship between the variables studied by the statistical method of Pearson coefficients showed positive correlations of high intensity for the diameters studied (P < 0.01). Thus, we believed that our findings may support future reproductive studies in this species.

Sex determination in budgerigars using radiographic pelvimetry

“…Although positive correlations are commonly observed in the majority of studies on pelvic measurements, there are instances where negative correlations have been reported. For example, Leão et al (2022) found mostly positive correlations among pelvic measurements in Tamandua tetradactyla, and Pinheiro et al (2016) reported similar findings in the common marmoset. However, it should also be noted that there are slightly negative correlations among pelvis measurements in these animals.…”

“…Osteometric data from animal pelvises are commonly utilized for taxonomic classification, examining morphological variations within species, and identifying sexual dimorphism traits. Moreover, these obtained osteometric data offer significant insights into crucial scientific fields, including evolutionary studies, developmental research and forensic sciences (Pitakarnnop et al., 2017; Yilmaz & Demircioglu, 2021). It is especially important to examine the morphometric and morphological features of the pelvis in birds, to determine the phylogenic and allometric characteristics of bird species, to reveal their locomotor behaviour, to determine their ecological diversity, to control the healthy laying of eggs and to evaluate various congenital or acquired pathological changes related to the pelvis region (Frank et al., 2022; Reddy & Sivajothi, 2018; Rosen, 2012; Shatkovska et al., 2018).…”

“…Furthermore, studies have reported that the majority of measurement parameters obtained from the pelvis tend to be higher in males compared to females. However, the angle measurement parameters of the pelvis are generally found to be higher in females (Celimli et al., 2008; Monteiro et al., 2013; Pitakarnnop et al., 2017; Yilmaz et al., 2020). Consistent with the information provided, our study revealed that all linear measurement values ( L 1, L 2, L 3, L 4, L 5, L 6, L 7, L 8, L 9, L 10 and L 11) exhibited statistically significant differences between the sexes, with male budgerigars showing higher values compared to female budgerigars ( p < 0.05).…”

“…It is widely used in the diagnosis of many cases, such as hernia, tumours, ectopic eggs, fractures, lipoma, ovarian cystic hyperplasia, oophoritis and egg retention in pet birds (Durmus, 2022;Kılıcarslan, 2012;König et al, 2016;Krautwald-Junghanns et al, 2011;Kubiak, 2020). Furthermore, this imaging method proves valuable in determining the sex of animals (Celimli et al, 2008;Leão et al, 2022;Monteiro et al, 2013;Pinheiro et al, 2016;Silva et al, 2020;Szara et al, 2022). To the best of our knowledge, there is currently no research available regarding the application of this method in determining the sex of budgerigars.…”