Indirect selection of forage yield in Italian ryegrass

Mittelmann, Andréa; Buchweitz, Elizandra Döring; Goulart, Eduardo Silveira

doi:10.12702/1984-7033.v06n01a14

Cited by 3 publications

(3 citation statements)

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“…Previous studies have reported phenotypic correlations of 0.96 and 0.97 between DMY and FMY in perennial ryegrass and Lolium multiflorum Lam. spaced plants, respectively (Frandsen and Fritsen, 1982; Mittelmann et al, 2006). Frandsen (1986) did not present the data for the correlations between DMY and FMY in perennial ryegrass sward plots but described them as highly significant and positive.…”

Section: Resultsmentioning

confidence: 99%

Efficiency of Indirect Selection for Dry Matter Yield Based on Fresh Matter Yield in Perennial Ryegrass Sward Plots

et al. 2008

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Forage dry matter yield (DMY) is a high‐priority trait in breeding perennial ryegrass (Lolium perenne L.). However, determining dry matter concentration is highly labor intensive. For a similar level of resources, indirect selection based on fresh matter yield (FMY) would allow a greater number of replicates, genotypes, or both to be evaluated. Our objective was to estimate the efficiency of indirect selection for DMY based on FMY of pure perennial ryegrass sward plots. Over a 14‐yr period, replicated trials, containing perennial ryegrass genotypes of similar ploidy and maturity category, were sown in Ireland and assessed for DMY and FMY at each harvest over two consecutive years. Forage was generally surface dry when harvested. The estimated efficiency of indirect selection based on two replicates and comparable selection intensity was high (≥0.80). Simulation models indicated that resources would be used more efficiently by evaluating more genotypes than by increasing the number of replicates. For example, doubling the number of plots to increase the number of replicates from two to four indicated an increase in the efficiency of indirect selection from a mean 0.88 to 0.94. However, doubling the number of plots and including more genotypes, facilitating greater selection intensity, indicated an increase in the efficiency of indirect selection from a mean 0.88 to 1.04. This study indicates that FMY can be used successfully as an indirect selection method of increasing DMY in perennial ryegrass swards.

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Section: Resultsmentioning

confidence: 99%

Efficiency of Indirect Selection for Dry Matter Yield Based on Fresh Matter Yield in Perennial Ryegrass Sward Plots

et al. 2008

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“…These traits may be selected as estimates of early production. In a Brazilian population of Italian ryegrass, correlations with early dry matter production were 0.50 for natural height and 0.54 for diameter (Mittelmann et al 2006). Castro et al (2003) found an even higher value for the diameter x dry matter yield correlation (0.68).…”

Section: Resultsmentioning

confidence: 88%

Half-sib progenies evaluation in velvet grass

Mittelmann

Buchweitz

2010

Crop Breed. Appl. Biotechnol.

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-Velvet grass (Holcus lanatus L.) has a great potential use for winter pasture in subtropical regions due to its good establishment, persistence, high forage production, cold resistance, palatability and tillering ability. The objective of this work was to estimate genetic variability and heritability of agronomic traits and to identify superior progenies. Sixty half-sib progenies were assessed for natural height at the vegetative stage (NH), plant diameter (diameter), heading date (cycle), final height (after flowering) (FH), and tiller number (tillers). Difference among progenies was observed for all traits. Heritability estimates were 38%, 32%, 92%, 57% and 64% for NH, diameter, cycle, FH and tillers, respectively

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“…De maneira geral, parece haver uma ligação entre o rápido desenvolvimento inicial de uma população e o fato de florescer e cessar a produção mais cedo. Porém, já foi demonstrado que essa associação pode ser quebrada (MITTELMANN et al, 2006).…”

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