Variability in size and shape in muscovy duck with age: principal component analysis.
2013
Body weight and six linear body measurements, body length (BL), breast
circumference (BCC), thigh length (TL), shank length (SL), total leg length
(TLL) and wing length were recorded on 150 male and female muscovy ducklings
and evaluated at 3, 5, 10, 15 and 20 weeks of age. Principal component
analysis was used to study the dependence structure among the body
measurements and to quantify sex differences in morphometric size and shape
variations during growth. The first principal components at each of the five
ages in both sexes accounted between 71.54 to 92.95% of the variation in the
seven measurements and provided a linear function of size with nearly equal
emphasis on all traits. The second principal components in all cases also
accounted for between 6.7 to 16.17% of the variations in the dependence
structure of the system in the variables as shape, the coefficient for the
PCs at various ages were sex dependent with males showing higher variability
because of spontaneous increase in size and shape than females. Contribution
of the general size factor to the total variance increase with age in both
male and female ducklings, while shape factor tend to be stable in males and
inconsistent in females.
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