Produção de matéria seca e proteína bruta e relação folha/colmo de genótipos de capim-elefante aos 56 dias de rebrota

Lima, Erico da Silva; Silva, José Fernando Coelho da; Vásquez, Hernán; Araújo, Saulo Alberto do Carmo; Lista, Fábio Nunes; Costa, Dorival Pereira Borges da

doi:10.1590/s1516-35982007000700009

Cited by 10 publications

(14 citation statements)

References 5 publications

(3 reference statements)

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“…Genotype CNPGL 92-79-2 had moderate forage mass that was also not significantly different from that of low-mass genotypes. This contrasts with the results of Lima et al (2007) with this genotype: they reported high forage mass (13.5 kg.ha -1 DM) and digestible dry matter yield (8.06 kg.ha -1 DDM) 56 DAC (days after the standardization cut), similar to the values that they observed for cvs. Cameroon and Mineiro IPEACO.…”

Section: Trial 2: Cutting and Regrowthcontrasting

confidence: 99%

“…Guaçu. These are low values compared to those reported by Lima et al (2007), which ranged from 0.95 in Napier grass to 1.43 in genotype CNPGL 91-25-1 in an experiment with a shorter regrowth period (56 DAC). There were significant differences in number of internodes (P=0.0069), stem diameter (P<0.0001), and canopy height (P=0.005) across Elephant grass genotypes (Table 5).…”

Section: Trial 2: Cutting and Regrowthcontrasting

confidence: 75%

“…The plant height achieved by a genotype may be related to its productive potential under cutting conditions. Indeed, Lima et al (2007) evaluated Elephant grass genotypes subjected to cutting and reported that plant height was highest in the most productive genotypes (Cameroon, Mineiro IPEACO, and CNPGL 92-79-2). Mello et al (2002) also found a positive relationship between plant height and total and leaf dry matter in the dry and rainy seasons for 71 Elephant grass clones (pooled data).…”

Section: Trial 2: Cutting and Regrowthmentioning

confidence: 99%

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Forage mass and agronomic traits of Elephant grass genotypes under free-growth and conventional cutting systems

Gimenes

Berndt

Mateus

et al. 2016

Semin: Ciênc. Agrár.

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Few grass genotypes with high yield potential are used as fodder in Brazil, making it necessary to develop new cultivars. In this study, we compared tiller density, forage mass, and agronomic traits across 12 Elephant grass (Pennisetum purpureum Schum.) genotypes under free-growth and conventional cutting systems at the Agência Paulista de Técnologia dos Agronegócios (APTA), Andradina, São Paulo, Brazil. The experimental design of the two trials was three replicates of a randomized complete block, each experimental unit consisting of 37.5 m 2 plots with five rows spaced 1.5 m apart. We estimated tiller density 30, 60, and 150 days after planting (DAP), and 90 days after cut (DAC), and harvested the grass 150 DAP and 90 DAC for determination of forage mass and agronomic traits. In the free-growth system, forage mass was highest in genotypes CNPGL 00-155-2, CNPGL 92-41-1, CNPGL 92-51-1, and CNPGL 96-21-1 and in cultivar Guaçu. After cutting and regrowth, forage mass was highest in genotypes CNPGL 93-41-1, CNPGL 92-41-1, and CNPGL 91-11-2 and in cultivars Mineiro IPEACO, Guaçu, and Pioneiro. Stem mass was higher than leaf mass in the two trials, with leaf/stem ratio in most genotypes below 1.0. Aerial tiller density was highest for genotypes Pioneiro and CNPGL 00-155-2, and stem diameter was smallest in cv. Pioneiro in the free-growth and in the cutting and regrowth systems (9.7 and 7.62 mm, respectively). After regrowth, plant height ranged from 0.56 m in cv. Guaçu to 2.0 m in cv. Mineiro IPEACO and the mean number of internodes.stem -1 ranged from 2.1 in cv. Guaçu to 7.4 in cv. Pioneiro. Forage mass correlated positively with basal tiller density (r =0.4096) and negatively with stem diameter (r =-0.4879) in the free-growth trial, but relationships were not significant after regrowth. , com cinco linhas espaçadas de 1,5 m de distância. Foram estimamos a densidade de perfilhos aos 30, 60 e 150 dias após o plantio (DAP), e 90 dias após o corte (DAC), e colhidas a a forragem 150 DAP e 90 DAC para a determinação da massa de forragem e características agronômicas. No sistema de livre crescimento, massa de forragem foi maior nos genótipos CNPGL 00-155-2, CNPGL 92-41-1, CNPGL 92-51-1 e 96-21-1 CNPGL e no cultivar Guaçu. Após o corte e rebrota, a massa de forragem foi maior nos genótipos CNPGL 93-41-1, CNPGL 92-41-1 e 91-11-2 CNPGL e nos cultivares Mineiro IPEACO, Guaçu, e Pioneiro. A massa de colmos foi maior do que a massa foliar nos dois experimentos, com relação folha /colmo na maioria dos genótipos inferior a 1,0. Densidade de perfilhos aéreos foi maior para genótipos Pioneiro e CNPGL 00-155-2, e diâmetro do caule foi menor no cv. Pioneiro nos sistemas de crescimento livre e de corte e rebrota (9,7 e 7,62 mm, respectivamente). Depois da rebrotação, a altura da planta variou de 0,56 m na cv. Guaçu a 2,0 m na cv. Mineiro IPEACO e o número médio de internodes do colmo variou de 2,1 em cv. Guaçu para 7,4 em cv. Pioneiro. A massa de forragem foi positivamente correlacionada com a densidade de perfilhos basais (r =...

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Section: Trial 2: Cutting and Regrowthcontrasting

confidence: 99%

Section: Trial 2: Cutting and Regrowthcontrasting

confidence: 75%

Section: Trial 2: Cutting and Regrowthmentioning

confidence: 99%

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Forage mass and agronomic traits of Elephant grass genotypes under free-growth and conventional cutting systems

Gimenes

Berndt

Mateus

et al. 2016

Semin: Ciênc. Agrár.

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“…has one of the highest production potentials among tropical forages used in intensive grazing, both in terms of forage production and animal performance (Carvalho et al, 2005;Lima et al, 2007). However, problems related to management have hampered its adoption by farmers.…”

Section: Introductionmentioning

confidence: 99%

“…Trindade et al (2007), while studying Urochloa brizantha, cultivar Marandu, reported that the combination of 95% of light interception for regrowth interruption, associated with post-grazing height of 15 cm, provided greater proportion of leaves in the forage. For elephant grass, several studies have evaluated forage production and canopy structure (Deresz, 2001;Paciullo et al, 2003;Carvalho et al, 2005;Lima et al, 2007), but those involving management strategies based on morphological criteria for defining the defoliation interval are still incipient (Gomide et al, 2011b). Moreover, knowledge of the response of new forage accesses to variation in management represents a breakthrough in the development and future adoption of cultivars.…”

Section: Introductionmentioning

confidence: 99%

Forage production of elephant grass under intermittent stocking

Chaves

Gomide

Ribeiro

et al. 2013

Pesq. agropec. bras.

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-The objective of this work was to evaluate the dry matter production of elephant grass (Pennisetum purpureum) genotypes, managed under intermittent stocking. A completely randomized design was used, with two genotypes and three replicates. The treatments consisted of factorial combinations (2x2x2) of genotypes ('BRS Kurumi' and the clone CNPGL 00-1-3), two light interception levels (LI) at the onset of grazing (90 and 95%), and two post-grazing canopy heights (30 and 50 cm). A total of 24 Holstein x Zebu crossbred heifers were used. The stocking density varied in order to finish the grazing periods in two days. The interval between the defoliation, based on 95% LI, resulted in a higher leaf mass per grazing cycle. The post-grazing height of 30 cm did not affect the number of grazing cycles but provided a greater herbage accumulation rate. The cultivar BRS Kurumi has higher pasture growth, lower rest period, and greater number of grazing cycles, which results in increased forage production in the growing season.Index terms: Pennisetum purpureum, canopy structure, grazing efficiency, leaf dry mass, rotational grazing, rest period. Produção de forragem de capim-elefante sob lotação intermitenteResumo -O objetivo deste trabalho foi avaliar a produção de matéria seca de genótipos de capim-elefante (Pennisetum purpureum) manejado sob lotação intermitente. Utilizou-se o delineamento inteiramente casualizado, com dois genótipos e três repetições. Os tratamentos consistiram da combinação fatorial (2x2x2) de genótipos ('BRS Kurumi' e o clone CNPGL 00-1-3), dois níveis de interceptação luminosas (IL) por ocasião da entrada dos animais nos piquetes (90 e 95%) e duas alturas pós-pastejo do dossel (30 e 50 cm). Foram usadas 24 novilhas mestiças Holandês x Zebu. A densidade de lotação variou para que se finalizasse os períodos de pastejo em dois dias. O intervalo entre desfolhações com 95% de IL resultou em maior massa foliar por ciclo de pastejo. A altura pós-patejo de 30 cm não afetou o número de ciclos de pastejo, mas proporcionou maior taxa de acúmulo de forragem. A cultivar BRS Kurumi apresenta maior crescimento do pasto, menor intervalo entre pastejos e maior número de ciclos de pastejo, o que resulta em maior produção de forragem na estação de crescimento Termos para indexação: Pennisetum purpureum, estrutura de dossel, eficiência de pastejo, matéria seca foliar, pastejo rotacionado, período de descanso.

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<b>Produção, utilização e comercialização de dieta completa peletizada ou extrusada para equinos</b>

Feltre¹

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produção agrícola do volumoso até a comercialização da Dieta Completa e mostrouse viável economicamente nos três cenários propostos. Pode-se concluir que as fontes de fibra interferem na AAC-In e na digestibilidade aparente dos nutrientes; o processamento interfere nas AAC de glicose e Insulina, bem como nas concentrações de ácido láctico e na digestibilidade aparente dos nutrientes. Além disso, a interação entre esses fatores influenciam no metabolismo lipídico e no CDA do EE. Porém, esses resultados não trazem prejuízos comportamentais e metabólicos aos equinos. The aim of this research was to evaluate the effects of a complete product, pelleted or extruded, composed of different sources of fiber (dehydrated whole corn plant, dehydrated elephant-grass and Tifton 85 hay) in equine feeding management as well as its economic feasibility. For this research, we used eight male, geldings, ponies of the Mini-Horse breed. Diets were divided into Control Diet (50% Tifton 85 hay and 50% pelleted concentrate, supplied separately) and Complete Diet (50% roughage more 50% concentrated) provided as a single product. The experimental design was two Latin Squares balanced in a 2x4 factorial scheme, with contrasts applied in order to compare the effects of processing in relation to the control diet. In order to compare the effects within the processed diets, we proceeded to the exclusion of the control group applying a 2x3 factorial scheme. For the significant results, Tukey's test was used with p<0.05. We used four periods with 20 days each, intercalated for 21 days of washout. We evaluated the following variables: blood and fecal parameters, the Apparent Digestibility Coefficients of the nutrients (ADC) and the economic feasibility of the production. The results of the contrasts indicated differences (p<0.05) in the frequencies (%) of standing time, feeding and locomotion, and time of diet intake (minutes); for the Area Under the Curve (AUC) of glucose (G) and insulin (In); for cholesterol concentration; in ADC of dry matter (DM), neutral detergent fiber (NDF) and acid (ADF). The comparison made between the processed diets showed that the fiber source interfered (p<0.05) in the AUC-In values: the dehydrated whole corn plant diet presented higher AUC-In. The ADC of DM and Organic Matter was lower for the diet containing dehydrated elephant-grass. For the ADC of NDF and ADF, the tifton 85 grass diet presented better results. Processing interfered (p<0.05) in AUC-G and AUCIn: pelleting resulted in higher AUC in relation to the extrusion; in the concentration of lactic acid in feces: the pelleting presented higher concentrations in relation to the extrusion; in the ADC of ADF: the extrusion improved the apparent digestibility for this variable. There was an interactive effect (p<0.05) for the concentrations of triglycerides and very low density lipoprotein: the diet with extruded Tifton 85 hay presented higher concentrations in relation to the diet containing dehydrated whole corn plant; for the ADC of the ethereal extract (E...

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Produção de matéria seca e proteína bruta e relação folha/colmo de genótipos de capim-elefante aos 56 dias de rebrota

Cited by 10 publications

References 5 publications

Forage mass and agronomic traits of Elephant grass genotypes under free-growth and conventional cutting systems

Forage mass and agronomic traits of Elephant grass genotypes under free-growth and conventional cutting systems

Forage production of elephant grass under intermittent stocking

<b>Produção, utilização e comercialização de dieta completa peletizada ou extrusada para equinos</b>

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