REPETIBILIDADE EM GENÓTIPOS DO GÊNERO URUCHLOA spp.

Repeatability is an important parameter to genetic breeding of perennial species. The objective was to evaluate the repeatability of agronomic characteristics in genotypes Urochloa spp. by different methods. Twenty-seven genotypes were evaluated in a randomized block design with 3 replicates. The method of mixed models presented the lowest repeatability values to all characteristics while the principal components presented the highest values. Coefficients raging from 0,0929 to 0,3284 were observed to forage production and from 0,0917 to 0,4157 to leaves percentage. The highest values were observed to regrowth index (from 0,2501 to 0,4630). In general, the different methods presented high variation in the coefficient. The methodologies based on principal component analysis provide greater values of repeatability and the use of mixed models provided lower values.