composição bromatológica da silagem de quatro genótipos de girassol, ensilados em cinco diferentes idades de corte bromatological composition of silage of four sunflower genotypes ensiled at different harvesting ages

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ID: 157674
2005
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Abstract
Determinaram-se a composição bromatológica do material original e das silagens de quatro genótipos de girassol (M742, MG4, PM92007 e VDH483) utilizados para produção de grãos, ensilados em diferentes idades de corte após o plantio e aos 90, 97, 104, 111, e 118 dias, e o melhor momento de colheita desses cultivares para ensilagem. Os teores de matéria seca variaram entre as idades e cultivares, sendo observados valores de 12,7% a 42,2% no material original e 11,1% e 40,2% na silagem. Os valores de proteína bruta variaram de 8,3% a 12,6% no material original e de 9,4% a 12,9% na silagem. Foi observada diminuição (P<0,05) nos teores de carboidratos com a ensilagem. Os teores de extrato etéreo do material original e das silagens variaram de 2,2 a 13,3% no material original e de 3,0 a 17,9% na ensilagem. Houve diminuição dos teores de hemicelulose com a ensilagem, sugerindo que essa fração foi utilizada com substrato adicional para fermentação. Os teores de ácido lático diminuíram com o estágio de maturação da planta. Houve diminuição nos valores de digestibilidade in vitro da matéria seca com o avanço do estádio de maturação da planta. O melhor momento de colheita para os genótipos M742, MG4 e VDH483 foi aos 104 dias de idade e para o genótipo PM92007, aos 111dias.
The bromatological composition of four sunflower genotypes (M742, MG4, PM92007 and VDH483) used for producing seed, ensiled at different harvest ages (90, 97, 104, 111 and 118 days) after sowing, was used to determine the best time to ensile. Differences among ages and cultivars were found for dry matter of the genotypes. The crude protein values varied from 8.3 to 12.6% for the original sample and from 9.4 to 12.9% for the silage. A decrease (P<0.05) in the soluble carbohydrate values for the ensiled genotypes was observed. The ether extract values varied from 2.2 to 13.3% for the original sample and from 3.0 to 17.9% for the silage. The values of hemicellulose and lignin decreased with the ensiling process, suggesting the fibrous fractions contributed, as additional substrate source, for fermentation. The lactic acid values decreased with the plant maturity stage. The dry matter in vitro digestibility decreased with the plant maturity. The best time to ensile, based on the quality of the sunflower genotype M742, MG4 and VDH483 silage, was at 104 days of age and for the genotype PM92007 silage was at 111 days of age.
Reference Key
souza2005arquivocomposio Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;B.P.S. Souza;S.G. Coelho;L.C. Gonçalves;F.A.P. Vieira;A.L.C.C. Borges;N.M. Rodriguez;J.A.S. Rodrigues;Borges;E.S. Saliba
Journal Environmental research
Year 2005
DOI
10.1590/S0102-09352005000800011
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000800011
Keywords
in vitro ph sunflower digestibility cultivar cutivar

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