Sex determination in domestic rock pigeons (Columba livia) using radiographic morphometry

Determination of sex on the base of external morphological features is very difficult in most birds. However, molecular sex identification methods can be used for sexing of these so-called monomorphic bird species. This study analysed the sexual dimorphism of radiographic morphometric features in rock pigeons whose sexes were determined by the molecular sex identification method. Body weights and 21 radiographic measurements of 43 rock pigeons (18 males and 25 females) were taken. Among cranium measurements, the skull width value was statistically significant in terms of gender (p < .01). Length of carpometacarpus (p < .001) was the most statistically significant measurement of the thoracic limb skeleton, and length of tarsometatarsus (p < .01) was the most statistically significant measurement in the pelvic limb. The body weight showed a positive correlation with all measurements. It was observed that 81.4% of the samples were classified correctly with the measurements used in the discriminant analysis. With this study's results, it can be concluded that sex determination in rock pigeons can also be made by radiographic morphometric methods. In addition, more measurements can be obtained with radiographic images compared to external morphometry.