Sexual analysis in turkey (Meleagris gallopavo) neurocranium using geometric morphometric methods

Gündemir, Ozan; Özkan, Ermiş; Dayan, Mustafa Orhun; Aydoğdu, Sedat

doi:10.3906/vet-1910-92

Cited by 28 publications

(23 citation statements)

References 13 publications

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“…Rarely, however, the authors are able to indicate features of the skull or postcranial skeleton that allow differentiating males from females. In a study conducted in the turkey neurocranium, sexual dimorphism was tried to be determined using geometric analysis [37]. In our study performed on the quail, can be seen that male individuals have wider skulls in caudal view.…”

Section: Discussionmentioning

confidence: 94%

Sex Determination in Japanese Quails (Coturnix japonica) Using Geometric Morphometrics of the Skull

Szara

Duro

Gündemir

et al. 2022

Animals

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The study investigated whether there is a morphological difference between the shape of the female and male quail’s skulls. For this purpose, 18 female and 21 male quails were used. After the skulls were obtained, their photographs were taken, and geometric analysis was performed. Dorsal (14 landmarks), caudal (8 landmarks), and ventral (13 landmarks) images of skulls were evaluated. As a result of the Principal Component Analysis (PCA), 28 principal components (PCs) were obtained for dorsal view, 16 PCs for caudal view, and 26 PCs for ventral view. PC1 (41.206%) for the caudal aspect explained the highest shape variation in terms of sex. It was seen that PC1 for dorsal view explained 33.046% and PC1 for ventral view explained 34.495% shape variation. For the dorsal view, the orbital pit of males was found to be deeper than females. The foramen magnum was narrower in female skulls. The lateral borders of the neurocranium were more pointed upwards in males. On ventral view, it was seen that male individuals had a wider skull in shape. Geometrically, it was determined that the male and female distinction was the best in the dorsal view. According to the dorsal view, only one male individual was found to be in the female group, and all other male individuals were completely separated from the females. After the dorsal view, the best distinction was seen ventrally. In the caudal examination, sexual discrimination was not fully seen. In this study, shape differences in quail’s skulls were examined between sexes, and shape differences were revealed geometrically. In addition to traditional morphometry studies, it is thought that geometric analysis studies will add a useful perspective to the literature.

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Section: Discussionmentioning

confidence: 94%

Sex Determination in Japanese Quails (Coturnix japonica) Using Geometric Morphometrics of the Skull

Szara

Duro

Gündemir

et al. 2022

Animals

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“…However, there is a geometrical analysis study in cattle (Parés-Casanova et al 2020) to determine the asymmetries of the fingers. In addition, sexual dimorphism with skull bones was demonstrated in birds using geometrical analysis (Gündemir et al 2020). In a study conducted in bats, the geometrical analysis of wing shapes was carried out and the shape relationships between the species were examined (Schmieder et al 2015).…”

Section: Resultsmentioning

confidence: 99%

“…The points on the photo are determined and the positions of these Digits Angle and Digits Length Ratio in Japanese Quail (Coturnix coturnix Japonica) points relative to each other are examined on the x-y coordinates and the shape variations are revealed. W ith this method, which is used especially in the field of osteology, the differences of bone shapes are revealed both between sexes and between species (Gündemir et al 2020;Gürbüz et al 2020;Şahiner and Yalçın, 2007).…”

Section: Introductionmentioning

confidence: 99%

Digits Angle and Digits Length Ratio in Japanese Quail (Coturnix coturnix Japonica)

Demircioğlu¹,

Duro²,

Güngören³

et al. 2021

IJAR

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Background: Digit lengths are dimorphic in some other creatures as in humans. In particular, gender analysis can be done using the ratio between the second finger (D2) and the fourth finger (D4). The aim of this study is to examine whether the ratio of foot fingers is related to gender in Japanese quail (Coturnix coturnix japonica).Methods: In this study, 60 adults (30 female and 30 male) Japanese quail foot digit length ratios were examined in relation to gender. The ratios of the lengths of the second finger (D2), the third finger (D3) and the fourth finger (D4) to each other were taken on the computer. Result: In addition, geometrical analysis of base posture positions between female and male individuals were made and shape differences were revealed. It was observed that the second finger (D2) of male birds was more introverted than in females. It was seen that Principal component analysis (PCA1) explained 53.07% of the total variation between female and male groups. PCA2 explained 17.6% of the total variation and PCA3 announced 11.83%. In statistical morphometric analysis, the difference in shape between the male and female was statistically insignificant. D2:D3, D2:D4 and D3:D4 ratios were higher in males. It was observed that the lateral angle in both genders was higher than medial angle. This difference was statistically significant (p less than 0.001). While the average of the lateral angle was 50.89% in all individuals, the average of the medial angle was 42.81%. The highest length in all individuals belonged to the third finger. It was observed that the ratio of D2:D4 among females used in the study was 0.867 in females and 0.877 in males.

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“…In a study, the differences between wolf and German Shepherd's mandible bone and skull shapes were determined using geometric analysis (Gürbüz et al, 2020). Gender analysis was performed using photographs of turkey skulls and statistical differences were revealed (Gündemir et al, 2020). In another study, mandibular bones of the same breeds were examined via this method (Yalçın et al, 2010).…”

Section: Investigation Of Os Coxae In Horses Using Geometric Morphometry Methodsmentioning

confidence: 99%

Investigation of Os Coxae in Horses Using Geometric Morphometry Method

Gündemir

Özkan

İnce

et al. 2020

Harran Üniversitesi Veteriner Fakültesi Dergisi

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In contrast to normal morphometric measurements, geometric morphometry is a method that can explain the differences and variations on the x-y coordinates of the specified points on a 2D plane. In this method, two-dimensional samples, such as pictures or x-rays, are used. The study aims to investigate the right os coxae of 23 adults (12 males, 11 females) horses geometrically. Photographs were taken from each sample at 120 centimeters distance and landmarks were made on these samples. 13 determining landmarks were used on os coxae. Medial endpoint of the narrowest section of the body of ilium and medial endpoint of ischial spine points were found to be statistically significant in terms of female and male distinction (P < 0.001). It was seen that the remaining points in the ventrolateral section did not have a statistically significant difference in gender discrimination. However, the difference between the genders in the ventral endpoint of coxal tuber and midpoint of coxal tuber in the dorsolateral section was statistically significant (P < 0.001). The difference between females and males is visually indicated using the morphology program. In females, it was observed that the points in the inner region are more lateral than males. Gender analysis studies can be conducted on materials such as bone using the morphometric results obtained as a result of such modeling studies.

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Sexual analysis in turkey (Meleagris gallopavo) neurocranium using geometric morphometric methods

Cited by 28 publications

References 13 publications

Sex Determination in Japanese Quails (Coturnix japonica) Using Geometric Morphometrics of the Skull

Sex Determination in Japanese Quails (Coturnix japonica) Using Geometric Morphometrics of the Skull

Digits Angle and Digits Length Ratio in Japanese Quail (Coturnix coturnix Japonica)

Investigation of Os Coxae in Horses Using Geometric Morphometry Method

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