Genetic evaluation and selection index in tetraploid Brachiaria ruziziensis |
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| Authors: | Rosangela Simeão Adriane Silva Cacilda Valle Marcos Deon Resende Sérgio Medeiros |
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| Affiliation: | 1. Brazilian Agricultural Research Corporation, Embrapa Beef Cattle, Campo Grande/MS, Brazil;2. Universidade Católica Dom Bosco (UCDB), Campo Grande/MS, CEP 79117‐900, Brazil;3. Brazilian Agricultural Research Corporation, Embrapa Forestry, Universidade Federal de Vi?osa, Vi?osa/MG, CEP 36570‐000, Brazil |
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| Abstract: | Half‐sib progenies of congo signal grass (Brachiaria ruziziensis Germain & Evrard, syn.: B. eminii, Urochloa ruziziensis) were analysed using a mixed model methodology. The objective was to estimate genetic and phenotypic parameters, predict individual genetic values, estimate correlations between characters associated with biomass production and forage nutritive value and use this information to determine the economic weights to compare three multiplicative selection indices. Individual narrow‐sense heritabilities corrected for inbreeding varied from 0.14 to 0.91 for characters associated with biomass production and from 0.04 a 0.24 for nutritional value characters. The correlations among characters associated with annual biomass production were of high magnitude. In contrast, biomass production characters were negatively correlated with crude protein, acid detergent fibre and lignin. Total dry matter yield, crude protein and regrowth ability were weighted separately in evaluations during wet and dry season or annually in selection indices. Index that considered characters annually resulted in better distribution of forage production along the year than indices that separated wet and dry season production. |
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| Keywords: |
Brachiaria
forage grass genetic parameters mixed models nutritional value progeny test tropical grass yield |
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