Factor Analysis of Biometric Traits of Kankrej Cows to Explain Body Conformation

Pundir, R. K.; Singh, P. K.; Singh, K. P.; Dangi, P.S.

doi:10.5713/ajas.2011.10341

Cited by 50 publications

(59 citation statements)

References 11 publications

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“…The variables associated with withers height, back height and rump height had the highest loadings (component-variate correlations), followed by thoracic girth. It corroborates the submission of Pundir et al [8], Salako [10], Shahin & Hassan [11] and Yakubu & Ayoade [13], between others, for whom the PC1 can be considered as a generalized size factor. Similarly, Ruales-España & Perdomo [9] extracted eight principal components from 31 original traits and concluded that these could be of great importance in the determination of body attributes of criole Romosinuano cow.…”

Section: Discussionsupporting

confidence: 77%

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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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Section: Discussionsupporting

confidence: 77%

“…Pundir et al [8] studied Kankrej cows using 18 measurements and these explained 66.0% of total variation. Salako [10] who studied Uda sheep using seven measurements and these explained 67.7% of the total variation.…”

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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“…The KMO values obtained for adult male (0.687) and female (0.696) Muscovy ducks in the present study were higher than the threshold value (0.5); thus indicating that the sample size was adequate to apply PCA (Pundir et al, 2011). In addition, values obtained for Bartllet's test of sphericity for male (Chi-square 711.842) and female (Chi-square 836.241) were significant and validated further the suitability of the data analyzed for PCA.…”

Section: Multivariate Analysiscontrasting

confidence: 69%

“…Kaiser-Meiyer-Olkin (KMO) measure of sampling adequacy was estimated to determine whether the common factor model was appropriate and a KMO value below five was rejected (Pundir et al, 2011). In addition, Bartlett's Test of Sphericity, which tests the null hypothesis that the original correlation matrix is an identity matrix used to test the validity of the Principal Component analysis (PCA) of the data sets (Shrestha et al, 2008) at P < 0.01.…”

Section: Principal Component Analysismentioning

confidence: 99%

“…Multifactorial analyses of morphological traits have been used to characterize different breeds of livestock as they give idea of body conformation and are used to describe a population or an individual in a better way than the conventional methods of grading and weighing (Pundir et al, 2011). Besides, application of multivariate techniques such as Principal Component Analysis and Discriminant Analyses to morphometric variables have been used extensively for assessing SSD in water birds and proved effective in identifying variables capable of separating sexes (Mc Cracken et al, 2000;Svalgelj and Quintana, 2007;Herring et al, 2011;De Marchi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Sexual size dimorphism and sex determination by morphometric measurements in locally adapted muscovy duck (Cairina moschata) in Nigeria

Oguntunji

Ayorinde

2015

AAS

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Sexual size dimorphism (SSD) is a common phenomenon in most mammalian and poultry species. This study was undertaken to investigate SSD in nondescript locally adapted Muscovy ducks in Nigeria by applying descriptive analysis, sexual dimorphism index (SDI), sexual size dimorphism index (SSDI) and Principal Component analysis to morphological variables. Besides, attempt was made to identify best morphological predictors of sex using Stepwise Discriminant analysis. Data on ten morphological traits; body weight, body girth, body length, wing length, shank length, shank circumference, thigh length, total leg length, bill length and bill width were taken from 1,020 extensively managed adult Muscovy ducks comprising 287 males and 733 females. These birds were randomly sampled from Rain Forest, Derived Savanna and Guinea Savanna agro-ecological zones of Nigeria. Sex significantly (P < 0.001) affected all morphometric measurements in favour of males. Assessment of relative contribution of morphological traits to SSD through SDI and SSDI revealed that body weight followed by skeletal frame-related variables (body length and wing length) were the most dimorphic traits. Three Principal Components were generated for each sex; accounting for 62.70 % and 54.24 % of the total variance explained of male and female ducks, respectively. In tandem with the SDI and SSDI results, Stepwise Discriminant analysis indicated body weight as the best predictor of sex of adult Muscovy ducks followed by wing length and body length; correctly classifying 98.5 % of ducks and are reliable for sex determination in the field. The established SSD in this study could be employed for description, utilization, selection and planning of improvement programs of male and female Muscovy ducks.Key words: ducks / Muscovy duck / Cairina moschata / sex / size / dimorphism / morphometric measurements / Nigeria Spolni dimorfizem in določitev spola na osnovi morfometričnih meritev pri lokalno prilagojeni muškatni raci (Cairina moschata) v Nigeriji Spolni dimorfizem telesne velikosti (SDTV) je splošen pojav pri večini vrst sesalcev in perutnine. To študijo smo zasnovali z namenom, da bi proučili SDTV pri doslej neopisani, na lokalne razmere prilagojeni muškatni raci v Nigeriji s pomočjo opisne analize, indeksa spolnega dimorfizma (ISD), indeksa spolnega dimorfizma telesne velkosti (ISDTV) in analize glavnih komponent variance morfoloških lastnosti. Poskušali smo tudi določiti morfološke lastnosti z največjo napovedno vrednostjo za določitev spola z več-stopenjsko diskriminantno analizo. Podatke o desetih morfoloških lastnostih: telesna masa, obseg telesa, dolžina telesa, dolžina krill, dolžina goleni, obseg goleni, dolžina stegna, dolžina noge, dolžina kljuna in širina kljuna, smo zbrali pri 1.020 muškatnih racah iz ekstenzivne reje, med katerimi je bilo 287 samcev in 733 samic. Ptice smo vzorčili naključno v agro-ekoloških conah deževnega gozda, degradirane in gvinejske savane v Nigeriji. Spol statistično značilno (p < 0,001) vpliva na morfometrične lastnosti. A...

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Multivariate characterisation of the phenotypic traits of Djallonke and Sahel sheep in Northern Ghana

Birteeb

Peters

Yakubu

et al. 2012

Trop Anim Health Prod

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The characterisation of the small ruminant populations in developing countries will play a major role in the maintenance of the genetic resources as the basis for future improvement in livestock production. The present study aimed at morphological characterisation of the two main breeds of sheep in Ghana by assessing variation within and between breed populations using principal component and discriminant analyses. The two breeds were the Sahel and the Djallonke sheep of both sexes and of two groups namely, young (1 year old, consisting of 74 animals) and mature sheep (≥ 2 years old, comprising 219 animals). The analysis of variance revealed significant (P < 0.05) differences in the morphological traits of the Sahel and the Djallonke sheep breeds with higher values recorded for the former. Sexual dimorphism was in favour of male animals in all the morphological traits examined. Mature animals also had comparative advantage over the young. Two principal components were extracted to discern the structure of the two genetic groups. The most discriminating traits between the two sheep breeds were rump height, height at withers, neck girth and pin-bone width. Mahalanobis distance between the two genetic groups was 5.723 (P < 0.0001). The developed discriminant functions clearly discriminated and classified the Sahel and the Djallonke sheep into their breeds of origin, thus yielding 100, 93.4 and 90.4 % accurate classification for the rams, ewes and the overall sheep population, respectively. The present approach would greatly help in establishing management and conservation policies for the sustainable production of the two Ghanaian sheep breeds.

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Factor Analysis of Biometric Traits of Kankrej Cows to Explain Body Conformation

Cited by 50 publications

References 11 publications

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

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

Sexual size dimorphism and sex determination by morphometric measurements in locally adapted muscovy duck (Cairina moschata) in Nigeria

Multivariate characterisation of the phenotypic traits of Djallonke and Sahel sheep in Northern Ghana

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