Forage peanut (Arachis spp.) genetic evaluation and selection.
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Forage peanut improvement for use in grass-legume mixtures is expected to have a great impact on the sustainability of Brazilian livestock production. Eighteen cloned Arachis spp. ecotypes were evaluated under clipping in a Brazilian Cerrado region and results analysed using a mixed model methodology. The objective was to estimate genetic and phenotypic parameters and to select the best ecotypes based on selection index applied on their predicted genotypic value. The traits of total dry-matter (DM) and leaf DM yield presented moderate (0_30 < h2g < 0_50) to high (>0_50) broad-sense heritability, in contrast to the low genetic variability in nutritional quality-associated traits. Ecotypes of Arachis spp. contained average crude protein concentrations of 224 g kg _1 DM in leaves and 138 g kg _1 DM in stems, supporting the potential role of these species to overcome the low protein content in Cerrado pastures. The correlations between yield traits and traits associated with low nutritional value in leaves were consistently significant and positive. Genetic correlations among all the yield traits evaluated during the rainy or dry seasons were significant and positive. The ecotypes were ranked based on selection index. The next step is to validate long-term selection of grass?Arachis in combination with pastures under competition and adjusted grazing in the Cerrado region.
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Amendoim forrageiro, Forage peanut, Repetibilidade, Produção sazonal, Seasonal production, Producción estacional, Arachis spp, Leguminosas forrajeras, Variación genética, Valor nutricional, Acumulación de materia seca, Fitomejoramiento, Heredabilidad, Pastizales, Rendimiento de los cultivos, Repetibilidad, Variación fenotípica, Melhoramento genético vegetal, Pastagem, Leguminosa forrageira, Parâmetro genético, Seleção fenótipa, Matéria seca, Rendimento, Hereditariedade, Cerrado, Valor Nutritivo, Plant breeding, Pastures, Forage legumes, Genetic variation, Phenotypic variation, Dry matter accumulation, Crop yield, Heritability, Repeatability, Nutritive value