Number of cuts for estimating forage productivity in P. maximum

Torres, Francisco Eduardo; Teodoro, Paulo Eduardo; Benites, Simone Botelho; Oliveira, Elisa Fidêncio de; Corrêa, Caio Cézar Guedes; Silva, Flávia Alves da

doi:10.14393/bj-v32n1a2016-29307

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…Probably, gene expression is not stable during early stages of the plant development. Martuscello et al (2007) and Torres et al (2016) reported higher estimates when harvests 1 and 2 were not used in the analysis.…”

Section: Resultsmentioning

confidence: 96%

“…No individual repeatability method gives precise estimation of the number of repeated measures for DMY over wide ranges of conditions, such as years and experimental sites, different genetic composition of the populations and time of harvest. The differences between methods in six studies (Martuscello et al, 2007, Lédo et al, 2008, Torres et al, 2016, and Exp. 1 and Exp.…”

Section: Resultsmentioning

confidence: 99%

“…Repeatability estimates from 15 harvests (Lédo et al, 2008) ranged from 0.23 to 0.54 for DMY and for the same 0.85 level of accuracy it is necessary at least ten harvests. Torres et al (2016) reported high repeatability from six harvests, ranging from 0.76 to 0.87 and accuracy levels from 0.94 and 0.98. They concluded that seven harvests are necessary to select the highest DMY cultivars at 0.85 accuracy level.…”

Section: Introductionmentioning

confidence: 95%

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<b>Repeatability, number of harvests, and phenotypic stability of dry matter yield and quality traits of Panicum maximum jacq.

Fernandes

Braga

Ramos

et al. 2017

Acta Sci. Anim. Sci.

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ABSTRACT. Selection of superior forage genotypes is based on agronomic traits assayed in repeated measures. The questions are how repeatable the performance of individual genotypes is and how many harvests are needed to select the best genotypes. The objectives were to estimate repeatability coefficients of dry matter yield (DMY) and forage quality, their phenotypic stability and the number of harvests needed for an accurate selection. Two randomized complete block design experiments data with 24 genotypes each, undergoing 12 and 16 harvests, over a period of 2 and 3 years, respectively, were used. The DMY repeatability estimates ranged from 0.42 to 0.55, suggesting a low heritability. The mean numbers of repeated measures were 5 and 7 harvests for 0.80 and 0.85 accuracy, respectively. The inclusion of the first two harvests negatively affects the estimates. Repeatability for quality traits ranged from 0.30 to 0.69, indicating low to moderate heritability.Keywords: repeated measures, selection efficiency, selection effectiveness.Repetibilidade, número de colheitas e estabilidade fenotípica da produção de matérica seca e de características de qualidade de Panicum maximum jacq. RESUMO.A seleção de genótipos superiores em forrageiras é feita para características agronômicas analisadas em medições repetidas no tempo. As questões estão relacionadas à repetibilidade do desempenho dos genótipos e ao número necessário de colheitas para selecionar aqueles superiores. Os objetivos foram estimar coeficientes de repetibilidade da produção de matéria seca (PMS) e de características de qualidade da forragem, a estabilidade fenotípica e o número de colheitas necessárias para uma seleção mais precisa. Dois experimentos em blocos casualizados com 24 genótipos cada um, submetidos a 12 e 16 colheitas, durante um período de dois e três anos, respectivamente, foram utilizados para o estudo. As estimativas de repetibilidade de PMS variaram de 0,42 a 0,55, sugerindo baixa herdabilidade. Os números de colheitas foram cinco e sete para 0,80 e 0,85 de acurácia, respectivamente. A inclusão das duas primeiras colheitas afeta negativamente as estimativas de PMS. A repetibilidade para as características de qualidade variou de 0,30 a 0,69, indicando baixa à moderada herdabilidade.Palavras-chave: medidas repetidas, eficiência de seleção, eficácia de seleção.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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<b>Repeatability, number of harvests, and phenotypic stability of dry matter yield and quality traits of Panicum maximum jacq.

Fernandes

Braga

Ramos

et al. 2017

Acta Sci. Anim. Sci.

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“…Probably this is due to the bias caused by the occurrence of lower repeatability coefficients from the methods based on principal component analyses, which tend to overestimate the value of the parameter under these conditions (Mansour et al, 1981). Torres et al (2016) evaluating three P. maximum cultivars, in six harvests, found coefficients of repeatability and determination (in parentheses) of 0.52 (87) and 0.86 (97) for the ANOVA and PCCOV methods, respectively, which were higher than those found in this study. The importance of SDM in breeding is low, since this component is not intended for improvement of the production, but can be reduced by selecting plants that have the highest leaf percentage.…”

Section: S%mentioning

confidence: 99%

Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq.

Ferreira

Martuscello

Braz

et al. 2019

Chil. j. agric. res.

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In experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coefficients of agronomic characteristics in Panicum maximum Jacq. using different methods and identify the best combinations between harvests according to the genotypic stabilization. Seventeen genotypes were evaluated in a randomized complete block design with three replicates. The coefficients of repeatability were estimated by the methods: ANOVA, structural analysis based on the mean of the correlation coefficients (SACOR), analysis of principal components based on the covariance matrix (PCCOV) and correlation matrix (PCCOR). In the genotypic stabilization, coefficients estimated by ANOVA and PCCOR were used. For total DM, repeatability coefficients ranged from 0.3500 to 0.4300 by the ANOVA and PCCOR methods, respectively. High repeatability coefficients were found for the characteristic leaf DM, while low coefficients were observed for leaf and stem percentages and leaf:stem ratio. For the genotypic stabilization of total DM and leaf:stem ratio, the best coefficients were observed for the combination of harvests 5 to 8. There are variations in the estimate of repeatability by different methods and the highest coefficients were those of the principal components based on the correlation and covariance matrices. For the genotypic stabilization, the best coefficients of repeatability and determination were observed for the harvests performed in the second rainy period.

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“…It produces around 33 Mg ha -1 year -1 of leaf dry matter over 14 days of grazing and 60 days of rest during dry seasons and, 12 days of grazing and 37 of rest during rainy periods (BRÂNCIO et al, 2003). This forage should be well explored during rainy seasons, when growth is more intense and nutritional quality is also better (TORRES et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Response of tropical forages to irrigation in Cerrado/Pantanal ecotone

Basso¹,

Torres²,

Teodoro³

et al. 2016

Biosci. J.

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ABSTRACT:This work aimed to evaluate the irrigation influence on the forage production of Panicum maximum, Pennicetum pupureum, Urochloa brizantha and Urochloa ruziziensis during the rainy and dry seasons in Cerrado-Pantanal ecotone. Trial was conducted at experimental area of irrigated agriculture of Universidade Estadual de Mato Grosso do Sul, Unit of Aquidauana. We assessed the interaction between irrigation versus tropical forage species in the rainy and dry seasons. The first factor is the irrigation or non-irrigation, while the second factor comprises the species. Experimental design used was randomized complete with four replications in factorial scheme 2x4. There were two forage collections during the dry the rainy" interval for standardization cutting and harvest at 45 days after. Traits evaluated dry matter of leaves (DML), dry matter of stems (DMS), total dry matter (DMT) and leaf/stem ratio (L/S) were assessed. Irrigation management influences the production of the assessed forage species only in dry seasons. Urochloa brizantha is the most recommended forage for the Cerrado-Pantanal ecotone region, due to its high forage production, especially when it comes to sheets. In dry seasons, P. purpureum has increased DMT under an irrigated system, but with lower L/S ratio.

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Number of cuts for estimating forage productivity in P. maximum

Cited by 8 publications

References 19 publications

<b>Repeatability, number of harvests, and phenotypic stability of dry matter yield and quality traits of Panicum maximum jacq.

<b>Repeatability, number of harvests, and phenotypic stability of dry matter yield and quality traits of Panicum maximum jacq.

Repeatability and genotypic stability of agronomic characteristics in Panicum maximum Jacq.

Response of tropical forages to irrigation in Cerrado/Pantanal ecotone

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