Discriminant analysis of sexual dimorphism in morphometric traits of local duck populations in Nigeria
This study was carried out to determine sexual dimorphism among local ducks populations in southeastern Nigeria by discriminant analysis of morphometric traits. A total of one hundred and forty-six (146) adult local ducks of both sexes randomly selected from their breeding tracts were used for the study. The nine (9) morphometric traits measured were body weight (BDW), Body Length (BDL), Body Circumference (BDC), Thigh Circumference (THC), Bill Length (BLL), Neck Length (NKL) Foot Length (FTL) Total Leg Length (TLL) and Wing Length (WNL). Data collected were subjected to analysis of variance while significant means were subjected to discriminant analysis. Results revealed that drakes were superior (p<0.05) to the ducks for body weight and all the body characteristics studied. Standardized canonical function coefficients of morphometric traits showed that body weight had the highest discriminating power, followed by shank length, total foot length, bill length, body length, neck length, thigh length and body circumference. Group centroids indicated that the body measurements were distinctly different from each other when sex is used as the discriminating factor. Classification results showed that 92.2% and 100% of original cases and also cross-validated test for local ducks were correctly classified into males and females respectively. These results could be used as baseline data for duck improvement and conservation programme in a bid to tackle food insecurity which is a global challenge.
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