Morphological Characterization of Five Nigerian Indigenous Chicken Types
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Journal of Scientific Research and Development
The sustainable management, utilization and conservation of a particular population of domestic animals require its characterization. Standard characterization and evaluation of particular populations of domestic animals may be carried out by using different methods, including traditional practices such as the use of descriptor lists of morphological characters. A detailed morphological study was performed on adult birds of five Nigerian indigenous chicken types. The chicken types include: Asa (frizzle feather), Abolorun (naked neck), Onigbaogbe (rose comb), Ibile (wild type), and Opipi (featherless wing). Eight morphological measurements were taken from birds of the different types. Tests of equality of group means revealed significant differences between means of the five types for 5 out of 8 morphological measurements. Morphological measurements were also analysed through discriminant analysis and hierarchical cluster analysis in order to establish relationships among the different types as well as to have a tool to assign new sets of data for unknown types to one of the groups analysed here. The first canonical function accounted for 72.7%, the second, third and fourth accounted for 20.4%, 5.5% and 1.4% respectively, between-group variability. Plotting the first, second and third principal components showed that the observed differences were mainly from all the measurements except jaw width and wing length. Visual examination of the samples along the canonical functions revealed some between-sample differentiations. The rose comb and the wild type were mostly isolated from each other and from all other types. The overall percentage of correctly classified cases was 56.0%. The proportion of individuals correctly classified into their original group was highest in the wild type (78.6%), then naked neck (63.6%) and featherless wing (60.0%), indicating that the wild type is highly divergent from the other types. Application of molecular genetics technique will be useful in confirming the detected phenotypic differentiation.
Chicken , Morphological measurements , Discriminant analysis , Canonical function , Nigeria
Adekoya, K.O. , Oboh, B.O., Adefenwa, M.A. and Ogunkanmi, L.A. (2013). Morphological Characterization of Five Types Nigerian Indigenous Chicken Types. Journal of Sci. Res. Dev. 14 : 55 – 66.