Genetic parameters and correlations of forage yield and nutritional quality in ruzigrass (Urochloa ruziziensis) half-sib families.
2024
SANTOS, E. M. dos | FONSECA, C. E. L. da | KARIA, C. T. | RAMOS, A. K. B. | CARMONA, R. | PESSOA FILHO, M. A. C. de P. | ÉRIKA MOREIRA DOS SANTOS, UNIVERSIDADE DE BRASÍLIA; CARLOS EDUARDO LAZARINI DA FONSECA, CPAC; CLAUDIO TAKAO KARIA, CPAC; ALLAN KARDEC BRAGA RAMOS, CPAC; RICARDO CARMONA, UNIVERSIDADE DE BRASÍLIA; MARCO AURÉLIO CALDAS DE PINHO PESSO, CPAC.
This study estimated genetic and phenotypic parameters, heritabilities, correlations, selection accuracy, and expected gain from selection for dry matter yield and nutritional traits in 178 half-sib ruzigrass families. Eight traits were evaluated, with nutritional quality measured via NIRS. Data analysis using mixed models and clustering revealed significant differences between progenies. Narrow-sense heritability ranged from 0.26 to 0.42, and selection accuracy ranged from 0.51 to 0.65. Genetic variation was lower for nutritional quality traits compared to dry matter yield. Dry matter yield had positive genetic correlations with neutral and acid detergent fiber and cellulose, but negative correlations with crude protein and hemicellulose. Clustering identified two groups of families: one correlated with in vitro dry matter digestibility and crude protein, and the other with remaining traits. Selecting for dry matter yield may reduce crude protein content but not affect digestibility; selecting for low fiber or high crude protein may improve forage quality.
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