Variabilidade e herdabilidade de caracteres morfológicos em clones de capim-elefante na Zona da Mata de Pernambuco

Silva, Antônio Luiz Cordeiro da; Santos, Mércia Virgínia Ferreira dos; Júnior, José Carlos Batista Dubeux; Lira, Mário de Andrade; Ferreira, Rinaldo Luíz Caraciolo; Freitas, Erinaldo Viana de; Cunha, Márcio Vieira da; Silva, Maria da Conceição

doi:10.1590/s1516-35982010001000005

Cited by 15 publications

(11 citation statements)

References 18 publications

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“…m -² was estimated at 38.7 days. The number of tillers is a characteristic of strong genetic character, which may explain the fact that there was no significant difference for some ages between transition and dry seasons (SILVA et al, 2010). In the last two seasons, there was variation in the magnitude of TPD, probably due to the dispersed precipitation that occurred during those seasons.…”

Section: Resultsmentioning

confidence: 99%

Biomass components of Pennisetum purpureum cv. Roxo managed at different growth ages and seasons

Maranhão

Cândido

Lopes

et al. 2018

Rev. bras. saúde prod. anim.

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SUMMARY This study was carried out aiming to evaluate the biomass components of elephant grass cv. Roxo at seven growth ages, during rainy, transition and dry seasons. A completely randomized design was adopted with a split plot arrangement over time. The treatments consisted of seven growth ages (9, 18, 27, 36, 45, 54 and 63) and three seasons (rainy, transition and dry). The variables green forage biomass, dead forage biomass, green stem biomass and green leaf blade biomass showed positive linear responses to age and had their magnitude influenced by the evaluated seasons. The live/dead material ratio showed a decreasing linear response as a function of age. The leaf blade/stem ratio showed a negative linear adjustment in the rainy season, reaching a critical value of 1.0 at 59 days, and it showed a quadratic adjustment in the transition season, with the maximum point at 27.53 days; however, this ratio was not influenced by age in the dry season, revealing an average value of 2.22 ± 0.27. The canopy height and leaf area index showed a positive linear response to age in the three seasons. Tiller population density showed quadratic behaviour for age, with maximum estimated values of 134 and 110 til. m-2 at 31.24 and 37.40 days in the rainy and dry seasons, respectively. Rainfall seasonality influences the magnitude of the daily increase of the distinct biomass components of Pennisetum purpureum cv. Roxo.

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Section: Resultsmentioning

confidence: 99%

Biomass components of Pennisetum purpureum cv. Roxo managed at different growth ages and seasons

Maranhão

Cândido

Lopes

et al. 2018

Rev. bras. saúde prod. anim.

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“…The high precipitation followed by high temperatures and light intensity in the region during the months preceding the harvest ( With the favorable soil-climatic conditions in the region, i.e., the increased rainfall and higher temperatures during the experimental period, elephant grass can develop more easily, because such conditions, according to Silva et al (2010), are near the ideal setting for the growth of this grass.…”

Section: Dry Matter Yield (Dmy)mentioning

confidence: 99%

Chemical Composition and Energy Yield of Elephant-Grass Biomass as Function of Five Different Production Ages

Freitas¹,

Barbé²,

Daher³

et al. 2017

JAS

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Elephant grass has high biomass production, with qualities suitable for conversion into bioenergy, but has long been used exclusively for animal feed and only in recent years has it become an energetic alternative. Therefore, it is necessary to select genotypes with potential for energy production. This study evaluated the effect of five harvest times (8, 12, 16, 20, and 24 weeks) on the yield and chemical composition related to biomass quality through combined polynomial regression analyses of the following elephant grass genotypes: Cubano Pinda, Mercker 86-México, Pusa Napier n°1, Mole de Volta Grande, P-241-Piracicaba, and King Grass. A completely randomized design with three replicates, in a split-plot arrangement, was adopted, including two factors (plots = genotypes, subplots = harvest times). The evaluated variables were whole-plant dry matter yield, in t ha -1 (DMY), percentage of neutral detergent fiber (%NDF), and percentage of acid detergent fiber (%ADF). The elephant-grass genotypes Cubano de Pinda, Mercker 86-México, and P-241-Piracicaba showed a linear first-degree effect as a function of the harvest intervals, indicating that they did not reach their maximum production potential. Genotypes Pusa Napier n°1, Mole de Volta Grande, and King Grass, in turn, had a linear second-degree effect. For the NDF variable, all genotypes showed a significant linear second-degree effect as a function of the harvest intervals, except P-241-Piracicaba, for which no regression was observed. For this genotype, there was a significant linear first-degree effect on the %ADF variable.

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“…Realizaram-se análises de digestibilidade in vitro da matéria seca de lâmina foliar e de colmo, segundo metodologia proposta por Tilley & Terry e modificada por Tinnimit & Thomas (1976), no Laboratório de Nutrição do Silva et al (2010), em estudo com esses mesmos clones, não observaram diferenças (P>0,05) no peso seco da parte aérea e de lâmina foliar entre os clones. Assim, na identificação de materiais superiores, devem ser incluídas diferentes características, além da produção e do teor de matéria seca.…”

Section: Resultsunclassified

“…Conforme relatos de Santos et al (2008), quando a forragem é fornecida picada no cocho, a capacidade do animal em selecionar folhas é limitada e, como a composição química da forragem ofertada depende principalmente da idade e do cultivar utilizado, deve-se priorizar cultivares de alta produtividade e com proporção equilibrada de caules e folhas. Silva et al (2010) observaram que genótipos 48 (CNPGL92F198.7) e 50 (CNPGL 94F44.3) são promissores para utilização como progenitores na geração de novos materiais de capim-elefante, notadamente para uso sob pastejo, por apresentarem maior porcentagem de lâminas foliares e melhor relação lâmina foliar:colmo. O teor de PB, tanto na lâmina foliar quanto no colmo, foi superior a 7%, nível crítico para o atendimento das necessidades de ruminantes, conforme Minson & Wilson (1994).…”

Section: Resultsunclassified

Variabilidade e herdabilidade de caracteres qualitativos relacionados à qualidade de forragem de clones de capim-elefante na Zona da Mata de Pernambuco

Silva¹,

Santos

Ferreira

et al. 2011

R. Bras. Zootec.

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RESUMO -Objetivou-se avaliar a variabilidade e herdabilidade de caracteres quantitativos relacionados à qualidade de forragem de 32 clones de capim-elefante (três testemunhas locais, da Zona da Mata de Pernambuco, e os demais provenientes da RENACE/ CNPGL). Utilizou-se delineamento inteiramente casualizado com testemunhas adicionais e aplicou-se a análise de variância por meio do procedimento de famílias com testemunhas intercalares. A avaliação foi realizada no período seco, aos 60 dias de crescimento.Foram observadas diferenças significativas entre os clones para as características fibra em detergente ácido de lâmina foliar e matéria orgânica no colmo, com médias de 34,05 e 78,83%, respectivamente. De maneira geral, a herdabilidade dos caracteres qualitativos foi baixa, inclusive com valores nulos para proteína bruta e fibra em detergente neutro de lâmina foliar e digestibilidade in vitro da MS da lâmina e do colmo. A composição química e a digestibilidade dos clones avaliados foram similares. Há poucas possibilidades de ganho na seleção de caracteres qualitativos, tendo em vista a baixa variabilidade e herdabilidade dos caracteres estudados.Palavras-chave: colmo, digestibilidade, fibra, folha, Pennisetum purpureum Variability and heritability of qualitative traits related to forage quality of Pennisetum clones in Zona da Mata in PernambucoABSTRACT -The objective of this research was to evaluate variability and heritability of quantitative traits related to forage quality of 32 clones of elephant grass (three local controls, from Zona da Mata de Pernambuco, and the remaining from RENACE/CNPGL). A complete randomized design was used with additional controls and analyses of variance was applied by using the procedure of families with controls between rows. Evaluation was performed during the dry period, at 60 days of growth. It was observed significant differences among clones for the traits acid detergent of leaf blade and stem organic matter, with means of 34.05 and 78.83%, respectively. In general, heritability of qualitative traits was low, including null values for crude protein and neutral detergent fiber of leaf blade and in vitro digestibility of dry matter of leaf blade and stem. Chemical composition and digestibility of evaluated clones were similar. There are few possibilities of gain in selection for qualitative traits considering the low variability and heritability of the studied characters.

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Variabilidade e herdabilidade de caracteres morfológicos em clones de capim-elefante na Zona da Mata de Pernambuco

Cited by 15 publications

References 18 publications

Biomass components of Pennisetum purpureum cv. Roxo managed at different growth ages and seasons

Biomass components of Pennisetum purpureum cv. Roxo managed at different growth ages and seasons

Chemical Composition and Energy Yield of Elephant-Grass Biomass as Function of Five Different Production Ages

Variabilidade e herdabilidade de caracteres qualitativos relacionados à qualidade de forragem de clones de capim-elefante na Zona da Mata de Pernambuco

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