Limits...
Biometric variability of goat populations revealed by means of principal component analysis.

Pires LC, Machado TM, Araújo AM, Olson TA, da Silva JB, Torres RA, Costa Mda S - Genet. Mol. Biol. (2012)

Bottom Line: The Moroccan breeds were separated into two groups, one comprising the Drâa and the other the Zagora and Rhâali breeds.The Anglo-Nubian and Boer breeds were similar to each other.In general, the use of graphical representation of PCA values allowed to distinguish genetic groups.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Agronomia, Universidade Federal de Piauí, Bom Jesus, PI, Brazil.

ABSTRACT
The aim was to analyze variation in 12 Brazilian and Moroccan goat populations, and, through principal component analysis (PCA), check the importance of body measures and their indices as a means of distinguishing among individuals and populations. The biometric measurements were wither height (WH), brisket height (BH) and ear length (EL). Thorax depth (WH-BH) and the three indices, TD/WH, EL/TD and EL/WH, were also calculated. Of the seven components extracted, the first three principal components were sufficient to explain 99.5% of the total variance of the data. Graphical dispersion by genetic groups revealed that European dairy breeds clustered together. The Moroccan breeds were separated into two groups, one comprising the Drâa and the other the Zagora and Rhâali breeds. Whereas, on the one side, the Anglo-Nubian and undefined breeds were the closest to one another the goats of the Azul were observed to have the highest variation of all the breeds. The Anglo-Nubian and Boer breeds were similar to each other. The Nambi-type goats remained distinct from all the other populations. In general, the use of graphical representation of PCA values allowed to distinguish genetic groups.

No MeSH data available.


Related in: MedlinePlus

Distribution of the 12 genetic groups of goats in Brazil and Morocco, in relation to the principal components 1, 2 and 3. Genetic groups: T = Toggenburg, S = Saanen, G = Anglo-Nubian, A = Alpine, B = Boer, D = Drâa, Z = Zagora, R = Rhâali, U = Azul, M = Marota, N = Nambi, P = Undefined goat breeds from Piauí.
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3526085&req=5

f3-gmb-35-777: Distribution of the 12 genetic groups of goats in Brazil and Morocco, in relation to the principal components 1, 2 and 3. Genetic groups: T = Toggenburg, S = Saanen, G = Anglo-Nubian, A = Alpine, B = Boer, D = Drâa, Z = Zagora, R = Rhâali, U = Azul, M = Marota, N = Nambi, P = Undefined goat breeds from Piauí.

Mentions: By relating principal components to known breed variability (Figures 2 and 3), the Brazilian Nambi-type appears to be removed from all the other groups, due to its short ears. The undefined breed goats from Piauí were also isolated from the other groups and placed in apposition opposite to the Nambi type goats. The closest groups to the undefined breed goats from Piauí were the Moroccan and the Brazilian Azul and Marota goats. The only difference between the groupings in Figures 2 and 3 is the positioning of the Drâa breed, which was included with the other Moroccan breeds and some Brazilian goats in the first analysis and then with the European breeds in the second analysis. This difference is easily explained by the variability among Drâa individuals, as shown in Figure 1. In Figure 3, the group constituted by the Moroccan Rhâali plus Zagora and the Brazilian Azul and Marota goats occupied an intermediate position between the European dairy breeds together with the Drâa, and the Anglo-Nubian together with the Boer. These results are in accordance with the literature (Igarashi et al., 2000; Ouali et al., 2000; Oliveira et al., 2007), and occasionally also with the origins of the respective populations.


Biometric variability of goat populations revealed by means of principal component analysis.

Pires LC, Machado TM, Araújo AM, Olson TA, da Silva JB, Torres RA, Costa Mda S - Genet. Mol. Biol. (2012)

Distribution of the 12 genetic groups of goats in Brazil and Morocco, in relation to the principal components 1, 2 and 3. Genetic groups: T = Toggenburg, S = Saanen, G = Anglo-Nubian, A = Alpine, B = Boer, D = Drâa, Z = Zagora, R = Rhâali, U = Azul, M = Marota, N = Nambi, P = Undefined goat breeds from Piauí.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3526085&req=5

f3-gmb-35-777: Distribution of the 12 genetic groups of goats in Brazil and Morocco, in relation to the principal components 1, 2 and 3. Genetic groups: T = Toggenburg, S = Saanen, G = Anglo-Nubian, A = Alpine, B = Boer, D = Drâa, Z = Zagora, R = Rhâali, U = Azul, M = Marota, N = Nambi, P = Undefined goat breeds from Piauí.
Mentions: By relating principal components to known breed variability (Figures 2 and 3), the Brazilian Nambi-type appears to be removed from all the other groups, due to its short ears. The undefined breed goats from Piauí were also isolated from the other groups and placed in apposition opposite to the Nambi type goats. The closest groups to the undefined breed goats from Piauí were the Moroccan and the Brazilian Azul and Marota goats. The only difference between the groupings in Figures 2 and 3 is the positioning of the Drâa breed, which was included with the other Moroccan breeds and some Brazilian goats in the first analysis and then with the European breeds in the second analysis. This difference is easily explained by the variability among Drâa individuals, as shown in Figure 1. In Figure 3, the group constituted by the Moroccan Rhâali plus Zagora and the Brazilian Azul and Marota goats occupied an intermediate position between the European dairy breeds together with the Drâa, and the Anglo-Nubian together with the Boer. These results are in accordance with the literature (Igarashi et al., 2000; Ouali et al., 2000; Oliveira et al., 2007), and occasionally also with the origins of the respective populations.

Bottom Line: The Moroccan breeds were separated into two groups, one comprising the Drâa and the other the Zagora and Rhâali breeds.The Anglo-Nubian and Boer breeds were similar to each other.In general, the use of graphical representation of PCA values allowed to distinguish genetic groups.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Agronomia, Universidade Federal de Piauí, Bom Jesus, PI, Brazil.

ABSTRACT
The aim was to analyze variation in 12 Brazilian and Moroccan goat populations, and, through principal component analysis (PCA), check the importance of body measures and their indices as a means of distinguishing among individuals and populations. The biometric measurements were wither height (WH), brisket height (BH) and ear length (EL). Thorax depth (WH-BH) and the three indices, TD/WH, EL/TD and EL/WH, were also calculated. Of the seven components extracted, the first three principal components were sufficient to explain 99.5% of the total variance of the data. Graphical dispersion by genetic groups revealed that European dairy breeds clustered together. The Moroccan breeds were separated into two groups, one comprising the Drâa and the other the Zagora and Rhâali breeds. Whereas, on the one side, the Anglo-Nubian and undefined breeds were the closest to one another the goats of the Azul were observed to have the highest variation of all the breeds. The Anglo-Nubian and Boer breeds were similar to each other. The Nambi-type goats remained distinct from all the other populations. In general, the use of graphical representation of PCA values allowed to distinguish genetic groups.

No MeSH data available.


Related in: MedlinePlus