Sources of shared variability for the egyptian buffalo body shape (conformation)

Shahin, Karima A.; Soliman, A. Y.; Moukhtar, A.E.

doi:10.1016/0301-6226(93)90049-n

Cited by 26 publications

(32 citation statements)

References 13 publications

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“…The present findings are in consonance with the observation of Shahin & in New Zealand White rabbits that the first factor (general size) explained the highest percentage of the total variance. Similarly (Shahin et al, 1993) reported in Egyptian buffalo that the first factor was characterized by high positive loadings on all body shape characters; the variables associated with body length had the highest loading, followed by heart girth and abdominal girth. It also corroborates the submission of Salako (2006) that the first principal component comprising seven measurements (foreleg length, tail length, face length, rump height, withers height, body length and heart girth) explained 67.7% of the generalized variance and can be considered as a generalized size factor.…”

Section: Resultsmentioning

confidence: 97%

Application of Principal Component Factor Analysis in Quantifying Size and Morphological Indices of Domestic Rabbits

Yakubu

Ayoade

2009

Int. J. Morphol.

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SUMMARY:Body weight and four morphostructural traits namely body length, heart girth, thigh circumference and ear length of 103 New Zealand White x Chinchilla crossbred rabbits were measured. The investigation aimed at describing objectively the interdependence among conformation traits and to predict body weight from their independent factor scores using principal component analysis. Phenotypic correlations between body weight and body dimensions were highly significant (r=0.61 -0.91; P<0.01). Pairwise correlations of the body shape characters ranged from moderate to high values. From the factor analysis with varimax rotation of the intercorrelated traits, two principal components which accounted for 90.27% of the total variance were extracted. The first principal component, PC1 termed general size, had its loadings for body length, heart girth and thigh circumference and explained 74.98% of the variance. Ear length primarily determined the second principal component, PC2 which contributed to 15.29% of the generalized variance. Orthogonal body shape characters derived from the factor analysis accounted for 81.7% of the variation in body weight of rabbits. The PC-based prediction model is preferable to linear measure-based models for selecting animals for optimal balance since it combines both size and shape components into a composite index for prediction.

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Section: Resultsmentioning

confidence: 97%

Application of Principal Component Factor Analysis in Quantifying Size and Morphological Indices of Domestic Rabbits

Yakubu

Ayoade

2009

Int. J. Morphol.

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“…Curiously, both Yakubu & Ayoade [13] in rabbit as Shahin et al [12] in buffalo obtained positive loadings on all body measurements. The variables associated with withers height, back height and rump height had the highest loadings (component-variate correlations), followed by thoracic girth.…”

Section: Discussionmentioning

confidence: 99%

Application of varimax rotated principal component analysis in quantifying some zoometrical traits of a relict cow

Casanova¹,

Sinfreu²,

Villalba³

2013

Korean Journal of Veterinary Research

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: A study was conducted to determine the interdependence among the conformation traits of 28 "Pallaresa" cows using principal component analysis. Originally 21 body linear measurements were obtained, from which eight traits are subsequently eliminated. From the principal components analysis, with raw varimax rotation of the transformation matrix, two principal components were extracted, which accounted for 65.8% of the total variance. The first principal component alone explained 51.6% of the variation, and tended to describe general size, while the second principal component had its loadings for back-sternal diameter. The two extracted principal components, which are traits related to dorsal heights and back-sternal diameter, could be considered in selection programs.

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“…Body measurements have been used in large animals to contrast variation in size and shape [5,21,22] and to estimate body weight [21,22]. The correlation between body dimensions may be different if these dimensions are treated as bivariate rather than multivariate.…”

Section: Introductionmentioning

confidence: 99%

“…The correlation between body dimensions may be different if these dimensions are treated as bivariate rather than multivariate. Since body measurements are interrelated both genetically and phenotypically [3,5,8,9,10,12,21,22], the analysis of these traits should consider interdependence among these traits. The presence of linear relationships among the predictors is termed multicollinearity.…”

Section: Introductionmentioning

confidence: 99%

Sources of shared variability among body shape characters at marketing age in new zealand white and egyptian rabbit breeds

Shahin

Hassan

2000

Ann. Zootech.

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-Body measurements (body length, thigh circumference, shank length and chest width) of 311 rabbits representing three breeds, New Zealand White (NZW), Red Baladi (RB) and Black Baladi (BB) purebreds were subject to factor analysis. The objectives of this study were (a) to disclose the main sources of shared variability among body shape characters, (b) deduce the factors that describe these traits, (c) quantify the breed differences in size and shape and (d) predict live weight at marketing age from orthogonal body shape characters. Body conformation 'shape' appeared to be controlled by common and unique factors. The communalities ranged from 0.80 for chest width to 0.99 for thigh circumference and uniqueness (special factors) made the balance. Compared with local breeds (RB and BB), NZW had higher communality (proportion of variance for a variable that is shared in common by other variables) for chest width and lower communality for thigh circumference and body length. Our findings indicated that most of the common variability in NZW body dimensions could be accounted for by factors representing general size and chest width. Corresponding factors in RB were general size and shank length and those in BB were general size and thigh circumference. Independent body shape characters derived from factor analysis accounted for 83.4%, 87.9% and 90.8% of the variation in live body weight in New Zealand White, Red Baladi and Black Baladi, respectively.

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Sources of shared variability for the egyptian buffalo body shape (conformation)

Cited by 26 publications

References 13 publications

Application of Principal Component Factor Analysis in Quantifying Size and Morphological Indices of Domestic Rabbits

Application of Principal Component Factor Analysis in Quantifying Size and Morphological Indices of Domestic Rabbits

Application of varimax rotated principal component analysis in quantifying some zoometrical traits of a relict cow

Sources of shared variability among body shape characters at marketing age in new zealand white and egyptian rabbit breeds

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