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Archivos de Zootecnia

On-line version ISSN 1885-4494Print version ISSN 0004-0592


OLIVEIRA, T.N. et al. Estimative of repeatability coefficients, for leaf spot ocurrence in Pennisetum sp. clones. Arch. zootec. [online]. 2011, vol.60, n.231, pp.797-808. ISSN 1885-4494.

The work was conducted at the Itambé Experimental Station, of the Pernambuco State Agricultural Research Enterprise, to obtain genetic parameters estimates and repeatability coefficient, under different methods, for leaf spot in Pennisetum clones. Sixteen Pennisetum clones were evaluated on a randomized block design, with five replicates, from March 2004 to May 2005, totaling seven evaluations. Repeatability coefficients were estimated by: analysis of variance, principal components - correlation matrix, principal components - covariance matrix, and structural analysis - correlation matrix. Maximum heritability for leaf spot was 95%. Repeatability coefficients the four methods ranged from 0.75 to 0.78 among. Seven evaluations were able to obtain determination a coefficient of 0.95 for all evaluated methods. No differences were observed among methods.

Keywords : Elephant-grass; Helminthosporium sp. Forage breeding; Genetic variability.

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