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Multivariate analysis for morphological traits of the Hamra goat population in two regions of Morocco

Published online by Cambridge University Press:  03 January 2017

B. Hilal ,
S. El Otmani ,
M. Chentouf  and
I. Boujenane
B. Hilal*
Affiliation:
Department of Animal Production and Biotechnology, Institut Agronomique et Vétérinaire Hassan II, Rabat, Morocco INRA, Regional Centre of Agronomic Research, Tangier, Morocco
S. El Otmani
Affiliation:
INRA, Regional Centre of Agronomic Research, Tangier, Morocco
M. Chentouf
Affiliation:
INRA, Regional Centre of Agronomic Research, Tangier, Morocco
I. Boujenane
Affiliation:
Department of Animal Production and Biotechnology, Institut Agronomique et Vétérinaire Hassan II, Rabat, Morocco
*
Correspondence to: B. Hilal, Department of Animal Production and Biotechnology, Institut Agronomique et Vétérinaire Hassan II, Rabat, Morocco. email: hilalbtissam@gmail.com
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Summary

The goal of this study was to characterize the Hamra goat population and to determine if Hamra goats of Beni Arouss and Rommani regions belong to the same population. Eleven morphometric traits of 157 Hamra animals (94 from Beni Arouss and 63 from Rommani) were used for this study. Overall, heart girth, body length, height at withers (HaW), height at rump (HS), chest depth (ChD), pelvis width (PW), chest width (CW), cannon circumference, head length (HeL), head width (HeW) and horn length (HL) of Hamra goats averaged 81.3, 61.5, 64.8, 65.3, 40.9, 19.3, 20.2, 9.67, 28.0, 26.3 and 23.4 cm, respectively. The effect of region was significant only on HaW, PW, HeL, HeW and HL, indicating certain homogeneity among goats of the two regions. Moreover, the inter region variance component ranged from 0 percent (absence of variability) for HS, CW, ChD and ChD to 18.5 percent for HeL, suggesting that the variability of body measurements between Beni Arouss and Rommani regions is very low. The factor analysis revealed four factors, which accounted for 73.5 percent of the total variance. The most discriminant variables between the two populations were HeL, HeW, PW and CW. The Mahalanobis distance between the two populations was 1.197, suggesting that there was genetic exchange between the two populations. The discriminant analysis showed that 80.9 percent of Rommani and 50.0 percent of Beni Arouss individuals were classified into their respective population. Results obtained will help in developing improvement and preservation strategies for the Hamra goat population.

Résumé

Le but de cette étude est de caractériser la population caprine Hamra et de déterminer si les caprins Hamra des régions Beni Arouss et Rommani appartiennent à la même population. Onze mensurations corporelles de 157 caprins Hamara (94 de Beni Arouss et 63 de Rommani) ont été utilisées pour cette étude. Globalement, les moyennes du tour de poitrine, la longueur du corps, la hauteur au garrot, la hauteur au sacrum, la profondeur de la poitrine, la largeur du bassin, la largeur de poitrine, le tour de canon, la longueur de la tête, la largeur de la tête et la longueur des cornes des caprins Hamra sont respectivement de 81,3, 61,5, 64,8, 65,3, 40,9, 19,3, 20,2, 9,67, 28,0, 26,3 et 23,4 cm. L'analyse de la variance a révélé un effet significatif de la région sur la hauteur au garrot, la largeur du bassin, la longueur et la largeur de la tête, et la longueur des cornes, indiquant certaine homogénéité entre les caprins des deux régions. La composante de la variabilité entre régions a varié de 0% (absence de variabilité) pour la hauteur au sacrum, la largeur et la profondeur de poitrine et le tour de poitrine à 18,5% pour la longueur de la tête. Par conséquent, il y a une faible variabilité entre les caprins des régions Beni Arouss et Rommani. L'analyse factorielle a révélé quatre facteurs représentant 73,5% de la variance totale. Les caractères les plus discriminants sont la longueur de la tête, la largeur de poitrine, la largeur de la tête et la largeur de bassin. La distance de Mahalanobis entre les deux populations de caprins est égale à 1,197. L'analyse discriminante a montré que 80,9% et 50% des individus respectivement des populations Beni Arouss et Rommani sont correctement classés dans leurs populations d'origine. Les résultats obtenus vont aider à élaborer des stratégies d'amélioration et de préservation de la population Hamra.

Resumen

El objetivo de este estudio es caracterizar la población de cabra Hamra y para determinar si Hamra cabras de las regiones Beni Arouss y Rommani pertenecen a la misma población. Once medidas corporales en 157 animales (94 Beni Arouss y 63 Romaníes) se utilizaron para este estudio. En general, la ronda del pecho, la longitud corporal, la altura de garrotte, la altura de sacro, la profundidad del pecho, la anchura del pelvis, la anchura del pecho, la circunferencia de cañón, la longitud de la cabeza, la anchura de la cabeza, y la longitud de los cuernos de cabras Hamra promediado 81.3, 61.5, 64.8, 65.3, 40.9, 19.3, 20.2, 9.67, 28.0, 26.3 y 23.4 cm, respectivamente. El análisis de la varianza reveló un efecto significativo de la región solamente en los caracteres: la altura del garrote, la anchura de la pelvis, la longitud y la anchura de la cabeza, y la longitud de los cuernos, lo que indica una cierta homogeneidad entre las cabras en las dos regiones. El componente de la variabilidad entre región varía desde 0% para la altura de sacro, la anchura y la profundidad del pecho, y la ronda del pecho (falta de variabilidad entre las regiones) hasta 18,5% para la longitud de la cabeza. Por lo tanto, hay poca variabilidad entre las dos regiones (Beni Arouss y Rommani). El análisis factorial reveló cuatro factores, que representa el 73,5% de la varianza total de los caracteres. Las características más discriminantes para separar las dos poblaciones son: La longitud de la cabeza, la anchura del pecho, la anchura de la cabeza, y la anchura de la pelvis. La distancia de Mahalanobis entre las dos poblaciones de cabras es igual a 1,197. El análisis discriminante ha mostrado que 80,9% y 50% de los individuos están correctamente clasificados, respectivamente, en la población Beni Arouss y Rommani. Estas informaciónes ayudarán a elaborar estrategias para la mejora y la preservación de la población Hamra.

Keywords

Body measurementgoatsHamra populationMoroccomultivariate analysisMensurations corporellesCaprinsPopulation HamraMarocAnalyse multivariéeMenstruaciónes corporalesCabrasPoblación HamraMarruecosAnálisis multivariante
Type
Research Article
Information
Animal Genetic Resources/Resources génétiques animales/Recursos genéticos animales , Volume 59 , December 2016 , pp. 55 - 62
Copyright
Copyright © Food and Agriculture Organization of the United Nations 2016 

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