Fixing Multicollinearity Instability in the Prediction of Body Weight from Morphometric Traits of White Fulani Cows
نویسنده
چکیده
Body weight and nine morphostructural characters (withers height, rump height, heart girth, body length, head width, cannon circumference, shoulder width, rump width and rump length) of 83 White Fulani cows aged 1.5-2.4 years old were used to study the problem of multicollinearity instability in the estimation of body weight from morphological indices. Pairwise phenotypic correlations indicated a high and positive significant relationship between body weight and body dimensions (r = 0.610.94; P<0.01). Among the linear type traits, the highest correlation was observed between withers height and rump height (r =0.98) while the lowest value was recorded for rump height and shoulder width (r =0.51). Severe collinearity problems were evident in 5 of the zoometrical variables as portrayed by variance inflation factors (VIFs) higher than 10.00 (VIF = 33.096, 31.421, 24.612, 22.726 and 13.327 for rump height, withers height, rump length, heart girth and body length respectively). Collinearity problems were further confirmed from the computations of the eigenvalues of the correlation matrix, condition indexes and variance proportions. Heart girth was retained among the collinear variables, and singly accounted for 87.9%, 92.3% and 94.1% of the variation in body weight in the subsequent stepwise regression, quadratic and cubic models, respectively.
منابع مشابه
Morphometric Traits and Correlation between Body Weight and Body Size Traits in Isa Brown and IlorinEcotype Chickens
Data collected in 2012 on 400 chickens were subjected to two-way analyses of variance to estimatebody weight, morphometric traits as well as the correlationbetween body weight and morphometric traitsin Isa Brown and Ilorin ecotypechickens. The studied morphometric traits were comb length, beak length,head length, neck length, body length, wing length, shank length, thigh length, toe length, bre...
متن کاملEffects of Genetic and Non-genetic Factors on Body Weight and Carcass Related Traits in Two Strains of Japanese Quails
The current study was conducted to investigate the effects of genetic and non-genetic factors on body weight and carcass traits of Japanese quails. Two strains of Japanese quail (150 wild quails and 150 white quails) were used as base population. Four mating groups were used to produce progenies: wild male × wild female, white male × wild female, wild male × white female and white male × white ...
متن کاملPhenotypic characterization of white Fulani (Bunaji) and Bunaji x Friesian breed of cattle from National Animal Production Research Institute (NAPRI) cattle herd from Nigeria
Phenotypic characterization of Bunaji (White Fulani) and Bunaji x Friesian breed cattle of the institutional herd of National Animal Production Research Institute (NAPRI) Shika; Kaduna State, Nigeria was carried out for the purpose of comparism. A total of 163 cattle were used comprising 20 Bunaji Bulls, 106 Bunaji cows and 37 Bunaji x Friesian. Data measured directly from the animals in the he...
متن کاملInvestigation of morphometric variation and differentiation in common kilka (Clupeonella cultriventris) using factor analysis (PCA) and discriminant function analysis (DFA) in southern part of the Caspian Sea
This study was conducted to investigate morphometric variation and differentiation in common kilka (Clupeonella cultriventris) caught from Amir Abad and Babolsar fishing ports during winter 2013. Totally, 330 specimens (272 specimens from Amir Abad port and 58 specimens from Babolsar port) were caught by lift net and 30 absolute morphometric traits, 9 meristic traits, length and gonad, body wei...
متن کاملSex Differences in the Cerebellum and its Correlates with Some Body Traits in the African Grasscutter (Thryonomys swinderianus – Temminck, 1827): Morphometric Study
Introduction: Sexual dimorphisms in biological structures such as brain and behaviour have been widely recognized in animals and humans. The purpose of this study was to examine whether there are sex differences in the size of the cerebellum with other body traits, such as the head, tail and brain. Methods: Twelve grasscutters comprising of 6 males and 6 females were used in this study. Each b...
متن کامل