2 research outputs found

    Avaliação de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 2. Valor nutritivo Evaluation of elephant grass clones (Pennisetum purpureum Schum.) and an elephant grass x pearl millet (Pennisetum glaucum (L.) R. Br.) hybrid submitted to water stress. 2. Nutritive value

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    O objetivo deste trabalho foi avaliar o valor nutritivo de três cultivares de capim-elefante (Cameroon, Roxo de Botucatu e Mott) e de um híbrido de capim-elefante com o milheto (híbrido HV-241), cultivados sob diferentes condições de umidade (com e sem estresse hídrico). Utilizou-se o delineamento em blocos ao acaso com parcelas subdivididas e três repetições. Na parcela principal, estudou-se o efeito dos regimes de umidade e nas subparcelas, os diferentes clones. Foram avaliados os teores de matéria seca (% MS), proteína bruta (PB) e fibra em detergente neutro (FDN) e a digestibilidade in vitro da matéria seca (DIVMS). Os materiais submetidos a estresse hídrico apresentaram elevado grau de dessecação (mais de 58% de MS), sobretudo os cultivares de capim-elefante. As plantas submetidas a estresse hídrico apresentaram teores de PB (17,58%) significativamente superiores aos das irrigadas (14,45%), sendo que, entre os cultivares, apenas o Cameroon (14,68% PB) diferiu dos demais (16,46% PB). Quanto aos teores de FDN, não se verificou diferença entre os dois regimes de umidade, mas os cvs. Mott e Cameroon apresentaram teores superiores (61,79%) aos do cv. Roxo de Botucatu e do híbrido HV-241 (56,60%). Não foi verificada diferença na DIVMS entre os regimes de umidade nem entre os diferentes clones, sendo o valor médio de 53,07%.<br>This trial aimed to study the nutritive value of three Elephant grass clones (Cameroon, Roxo de Botucatu and Mott) and an Elephant grass with pearl millet hybrid (HV-241) cultivated under two different humidity conditions (with and without water stress). A randomized block design with split plots and three replicates was used. In the main plot, the effect of the humidity regimes was studied and in the split plot, the different clones. The dry matter (DM); crude protein (CP) and of neutral detergent fiber (NDF) content; and in vitro dry matter disappearance (IVDMD) were analyzed. The materials submitted to water stress showed a high dehydration level (more than 58% of DM), mainly in elephant grass cultivars. Plants submitted to water stress exhibited CP content (17.8%) significantly higher when compared to those plants submitted to the water treatment (14.45%), although, among cultivars, only Cameroon (14.68% CP) differed from the others (16.46%PB). As NDF contents, difference among the two humidity regimes was not observed, but Mott and Cameroon cultivars showed higher contents (61.79%) in relation to those of Roxo de Botucatu cultivar and HV-241 hybrid (56.60%). Difference in IVDMD among humidity regimes was not observed neither among the different clones and the average value was 53.07%
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