Cluster evaluation of Brazilian and Moroccan goat populations using physical measurements

Abstract

-The aim of this study was to compare the genetic diversity of 12 populations of goats in Brazil and Morocco (n = 796) through the use of physical measurements and different multivariate techniques. Traits measured included wither height (WH), distance from the brisket to the ground (BH) and ear length (EL). The standardized Euclidean distance (D) was adopted. The D values were submitted to clustering analysis using hierarchical methods (from nearest neighbor and UPGMAUnweighted Pair Group Method with Arithmetic Mean) and the numbers of clusters were analyzed using the Tocher optimization method. The population clustering was different depending on the method of analysis used. Among the hierarchical methods, UPGMA showed the best fit (CCC = 0.82). The Tocher method enabled the formation of four different clusters. Although the hierarchical and Tocher methods resulted in different cluster formations, both contributed to the interpretation of the genetic cluster divergence. The results obtained through UPGMA and Tocher optimization enable their use for future studies that may include a larger number of biometric variables on greater numbers of individuals and additional populations.

Caracterização Biométrica dos Caprinos da República de Cabo Verde

“…As medidas corporais consideradas nas análises de agrupamento foram AC, AP, CC, CO, AG, CT, CCAB, LR, LCAB, LIL, LIS, CGA, PCA, TCH e DHC que apresentaram fraca multicolinearidade (NC<100) na amostra. Resultado semelhante foi encontrado em rebanhos espanhóis de caprinos nativos (Herrera et al 1996, p. 46) em que a profundidade torácica não foi discriminante, não devendo, portanto, ser considerada na elaboração de estudos de diferenças raciais, e também por Pires et al (2013), com caprinos brasileiros e marroquinos.…”

Linear body measures to predict the live weight of creole goats in Northeastern of Mexico

“…Los animales RA tienen un mayor AC y LC, posiblemente por la influencia de la raza Nubia, al ser animales longilíneos con menos corpulencia y robustez que las razas cárnicas. Al comparar los resultados con otros de Argentina, Brasil y México (Lanari et al, 2003;Pires et al, 2013; los valores de AC son similares. No obstante, también hay valores inferiores en estudios realizados en Brasil, África y Pakistán (Moaeenud-Din et al, 2006;Semakula et al, 2010;Pires et al, 2013).…”

Multivariate analysis unravels genetic diversity and relationship between agronomic traits, protein, and dietary fiber in yardlong bean (Vigna unguiculata subsp. sesquipedalis Verdc.)

“…It will provide more information to the other clustering methods i.e. heatmap or dendrogram since it could identify the optimum number of clusters (Pires et al 2013).…”