Frações fibrosas da silagem de milheto com níveis crescentes de substituição de girassol.
2017
Resumo: A mensuracao dos constituintes da fracao fibrosa faz-se necessaria para caracterizar a digestibilidade da fibra que sao responsaveis pelas atividades metabolicas e fisiologicas no organismo animal. O presente estudo buscou mensurar as fracoes fibrosas da silagem de milheto com niveis de substituicao de girassol e mensurar a partir dos tratamentos: T1 ? 100% milheto; T2 ? 75% milheto + 25% girassol; T3 ? 50% milheto + 50% girassol; T4 ? 25% milheto + 75% girassol e T5 ? 100% girassol, avaliadas em 15 unidades amostrais. As variaveis analisadas foram: materia seca (MS), proteina bruta (PB), fibra insoluvel em detergente neutro (FDN), fibra insoluvel em detergente acido (FDA) e lignina (LIG). A analise de variância foi avaliada por meio de regressoes aplicadas no teste de Tukey (P 0,05) por meio de regressao linear..As variaveis MS, PB, FDN, FDA e LIG apresentaram diferenca significativa (P>0,05) de acordo com os niveis de substituicao de girassol. Os teores de MS decresceram de forma linear 0,14 ponto percentual na MS a cada incremento de 1% de girassol na massa ensilada, a silagem de girassol apresentou 15,5%de MS, o qual pode comprometer os parametros fermentativos da silagem. Apenas o tratamento com 100% de milheto apresentou teor de MS adequado. A proteina bruta elevou-se linearmente com a inclusao de girassol na massa ficando sempre acima do minimo de 7% recomendado para um bom funcionamento da microbiota ruminal, com minima de 7,73 a 10,67% de PB. A FDN apresentou comportamento linear decrescente a inclusao do com variacao de 48,08 a 58,52% de FDN. As variaveis da parede celular FDA e LIG apresentaram comportamento linear crescente com a inclusao de girassol na massa ensilada, com teores variando de 4,28 a 9,80 % e 33,81 a 37,24% para LIG e FDA, respectivamente. Uma possivel razao para esse aumento e a maior concentracao destas fracoes na planta de girassol (principalmente nas sementes). Adicoes maiores que 50% de girassol embora tenham elevado os teores de PB, nao refletem uma melhoria na qualidade bromatologica da silagem, pois a adicao de girassol incrementou os teores mais indigestives da fracao fibrosa (LIG e FDA), o que normalmente e acompanhado por um decrescimo na digestibilidade do volumoso. [Fibrous fractions of millet silage with increasing levels of sunflower substitution]. Abstract: Measurement of the constituents of the fibrous fraction is a measure to characterize a fiber digestion that are responsible for metabolic and physiological activities not animal body. The present study sought to measure as fibrous fractions of millet silage with sunflower substitution levels and to measure from treatments: T1 - 100% millet; T2 - 75% millet + 25% sunflower; T3 - 50% millet + 50% sunflower; T4 - 25% millet + 75% sunflower and T5 - 100% sunflower, evaluated in 15 sample units. The variables analyzed were: dry matter (DM), crude protein (CP), neutral detergent insoluble fiber (NDF), acid detergent insoluble fiber (ADF) and lignin (LIG). An analysis of variance for evaluated by means of regressions applied without Tukey's test (P 0.05) by means of linear regression. The variables MS, PB, NDF, ADF and LIG presented a significant difference (P> 0.05) according to the levels of sunflower substitution. The DM content decreased linearly 0.14 percentage point in DM at each increment of 1% of sunflower in the ensiled mass, the sunflower silage presented 15.5% DM, which could compromise the fermentative parameters of the silage. Only the treatment with 100% of millet had adequate DM content. The crude protein increased linearly with the inclusion of sunflower in the mass, always being above the minimum of 7% recommended for a good functioning of the ruminal microbiota, with a minimum of 7.73 to 10.67% of PB. The NDF presented a linear behavior, decreasing the inclusion of the variation with 48.08 to 58.52% of NDF. The ADF and LIG cell wall variables presented increasing linear behavior with the inclusion of sunflower in the ensiled mass, with contents ranging from 4.28 to 9.80% and 33.81 to 37.24% for LIG and ADF, respectively. A possible reason for this increase is the higher concentration of these fractions in the sunflower plant (mainly in the seeds). Additions higher than 50% of sunflower, although they did increase the CP content, do not reflect an improvement in the bromatological quality of the silage, since the addition of sunflower increased the more indigestible contents of the fibrous fraction (LIG and ADF), which is usually accompanied by a decrease in the digestibility of the roughage.
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