©1996-2009 All Rights Reserved. Online Journal of Veterinary Research.
Online Journal of Veterinary Research
Volume 5 : 217-230, 2001.
Sexing parrots (P. senegalus) by discriminant analysis
Zeffer A Sexing parrots (P. senegalus) by discriminant analysis Online J Vet Res 5:212-220, 2001. In many bird species, there is no obvious difference in the external features of the sexes. This study investigates the problem of sex determination in the Senegal Parrot (Poicephalus senegalus senegalus). The work was conducted on 27 captive individuals, 13 females and 14 males. 32 morphological characters were measured, and 20 showed significant differences between the sexes. The data were analysed with discriminant analysis, a method that separates groups of individuals by equations based on measured variables. A specialised case of discriminant analysis was also used (jack knifing). The result shows that in significantly separating characters, males are larger than females. This size difference is especially visible in facial characters. The discriminant analysis managed to separate 100 % of the individuals into the correct groups using only two characters: bill height and distance between the inner canthus. When using the jack-knifing method, 94,7 % of the individuals were correctly classified. This high percentage indicates that the equation is a useable tool for quick determination of the sex in Senegal Parrots.