Repetibilidade de variáveis produtivas e qualitativas da forragem e da excreta bovina em pastagem de braquiária

Teixeira, Vicente Imbroisi; Dubeux, José C. B.; Mello, Alexandre Carneiro Leão de; Lira, Mário de Andrade; Saraiva, Felipe Martins

doi:10.1590/s0100-204x2011000600012

Cited by 2 publications

(4 citation statements)

References 10 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies related to the r and R 2 for traits associated with nutritive value of the forage grasses are scarce, and generally have been based on the analysis of repeatability within a set of cultivars from the same species. In the studies of Shimoya et al (2002) and Teixeira et al (2011), the coefficients of repeatability found were close to or above 0.60 for crude protein, and this value is considered high. It is necessary to Table 2.…”

Section: Resultsmentioning

confidence: 78%

“…The repeatability analysis has been used to analyze different productive and structural traits in warmseason grasses (Lédo et al, 2008;Basso et al, 2009;Viana et al, 2009;Teixeira et al, 2011;Martuscello et al, 2015). Although the efforts that were made to estimate the repeatability of productive and structural traits in forage species, there is a gap in relation to the chemical composition.…”

Section: Introductionmentioning

confidence: 99%

“…Although the efforts that were made to estimate the repeatability of productive and structural traits in forage species, there is a gap in relation to the chemical composition. Only few publications were found in the literature (Shimoya et al, 2002;Teixeira et al, 2011); also, these publications only focused on isolated factors of chemical composition, in these cited cases, CP and N%, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of the nutritional value of grass species in the semiarid region by repeatability analysis

Coêlho

Mello

Santos

et al. 2018

Pesq. agropec. bras.

Self Cite

View full text Add to dashboard Cite

-The objective of this work was to estimate the repeatability (r) and the number of samples required to measure the nutritional value of four warm-season forage grasses growing in a semiarid region. The grasses evaluated were Urochloa mosambicensis, Cenchrus ciliaris, Digitaria pentzii, and Megathyrsus maximus. Evaluations occurred under two forage management conditions: stockpiling and grazing. Hand-plucked forage samples were analyzed for dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin, and in vitro DM digestibility (IVDMD). Four methods were used to estimate r and the number of samples required: analysis of variance, method of principal components based on the covariance (PCCOV) and the correlation (PCCOR) matrices, and structural analysis (EVCOR). Species were compared by the probability of the difference using the t-test. The method PCCOV presents the highest coefficient of repeatability and, therefore, a lower number of samples required. Lignin is the trait that have the highest number of samples required. In terms of qualitative traits, D. pentzii and M. maximus show the best forage qualities among the species evaluated.Index terms: chemical composition, IVDMD, sampling, warm-season grasses. Predição do valor nutricional de gramíneas na região semiárida por meio da análise de repetibilidadeResumo -O objetivo deste trabalho foi estimar a repetibilidade (r) e o número de amostragens necessárias para mensurar o valor nutricional de quatro gramíneas forrageiras tropicais numa região semiárida. As gramíneas avaliadas foram Urochloa mosambicensis, Cenchrus ciliares, Digitaria pentzii e Megathyrsus maximus. As avaliações ocorreram sob duas condições de manejo da forragem: diferimento e pastejo. Amostras de forragem coletadas por pastejo simulado foram analisadas para matéria seca (MS), proteína bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA), lignina e digestibilidade in vitro da MS (DIVMS). Para a análise de r e número de amostragens necessárias, utilizaram-se quatro métodos: análise de variância, componentes principais da matriz de covariância (CPCOV) e de correlação (CPCOR), e análise estrutural (AECOR). As espécies foram comparadas pela probabilidade da diferença, tendo-se utilizado o teste t. Para o método CPCOV, observa-se maior coeficiente de r, portanto, menor número de amostragens necessárias. A lignina é a característica que apresenta o maior número de amostragens necessárias. Em termos qualitativos, D. pentzii e M. maximus mostram melhores características entre as espécies forrageiras avaliadas.Termos para indexação: composição química, DIVMS, amostragem, gramíneas tropicais.

show abstract

Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of the nutritional value of grass species in the semiarid region by repeatability analysis

Coêlho

Mello

Santos

et al. 2018

Pesq. agropec. bras.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, several studies have been conducted to estimate the repeatability (ρ̂) of characteristics of interest in forage plants including Urochloa spp. (Basso et al, 2009;Souza Sobrinho et al, 2010;Teixeira et al, 2011;Martuscello et al, 2013;Matias et al, 2016;Coêlho et al, 2018;Figueiredo et al, 2019), Megathyrsus maximus (Martuscello et al, 2007;Braz et al, 2015;Martuscello et al, 2015;Coêlho et al, 2018;Ferreira et al, 2019), Medicago sativa L. (Botrel et al, 2000;Ferreira et al, 2010), Pennisetum purpureum Schum. (Shimoya et al, 2002;Rodrigues et al, 2020), and Lolium multiflorum Lamarck (Rios et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Repeatability and genotypic stability in intraspecific hybrids of Paspalum notatum Flügge

Weiler,

Silveira,

Brunes

et al. 2023

Revista Brasileira De Zootecnia

View full text Add to dashboard Cite

The objective of this study was to verify the repeatability of the expression of forage characters in intraspecific hybrids of Paspalum notatum Flügge to aid early selection. Across five harvests, plant height, tiller population density, leaf dry matter, stem dry matter, inflorescence dry matter, total dry matter, and growth habit were quantified for five parents, 189 hybrids, and a commercially available cultivar as a control (n = 195). Analysis of variance, principal components analysis, and structural analysis methods were used to determine the repeatability coefficients. The repeatability coefficients (ρ̂) for all evaluated characteristics generated by the different methods were between 0.05 (ANOVA II) and 0.95 (PCACov). For most of the characteristics studied, repeatability coefficients and determination coefficients were considered high. The repeatability coefficients estimates obtained for the eight characteristics evaluated with the ANOVA I and II methods were almost always lower than those obtained by PCA and structural analysis methods. Based on the covariance matrix, the principal component method generated higher estimates than those produced by ANOVA or structural analysis. Assuming a minimum 80% reliability to verify the relative superiority of the hybrids across all assessed traits, the five harvests proved adequate for selecting the optimal plant materials to advance to the next phase of the breeding program. However, reliable early selection for leaf dry matter, leaf:stem ratio, and total dry matter required a minimum of two harvests. The genetic parameters (h 2 and CVg) showed a favorable scenario for direct selection to increase forage production.

show abstract

Repetibilidade de variáveis produtivas e qualitativas da forragem e da excreta bovina em pastagem de braquiária

Cited by 2 publications

References 10 publications

Prediction of the nutritional value of grass species in the semiarid region by repeatability analysis

Prediction of the nutritional value of grass species in the semiarid region by repeatability analysis

Repeatability and genotypic stability in intraspecific hybrids of Paspalum notatum Flügge

Contact Info

Product

Resources

About