efeitos da compactação, da inclusão de aditivo absorvente e do emurchecimento na composição bromatológica de silagens de capim-tanzânia effects of different compaction degrees, inclusion of absorbent additive and wilting on the chemical composition of tanzania grass silages

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ID: 128585
2009
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Abstract
Objetivou-se neste trabalho avaliar o efeito do grau de compactação, da inclusão de aditivo absorvente e do emurchecimento da forragem na composição bromatológica de silagens de capim-tanzânia. O capim-tanzânia (Panicum maximum Jacq. cv. Tanzânia I) foi colhido aos 60-65 dias de crescimento e ensilado em silos experimentais de PVC adaptados com válvula tipo Bunsen, com capacidade individual de 8,5 kg. O delineamento experimental utilizado foi de blocos ao acaso, com quatro repetições, em esquema fatorial 3 × 5, composto de três tipos de silagens (testemunha, com 5% de polpa cítrica e com capim pré-emurchecido) e cinco graus de compactação (400, 500, 600, 700 ou 900 kg/m³). O aumento da densidade reduziu o pH e o N-amoniacal, de modo que, em maiores densidades, o pH se manteve na faixa ideal. A inclusão de polpa cítrica e o pré-emurchecimento do capim reduziram as perdas por efluente e gás das silagens. Com o aumento da densidade, a quantidade de efluente aumentou na silagem testemunha e diminuiu nas silagens com polpa cítrica.
The objective of this work was to evaluate the effects of different compaction degrees, inclusion of absorbent additive and wilting on the chemical composition of tanzania grass silages. The experiment was conducted using tanzania grass (Panicum maximum Jacq. cv. Tanzânia I) harvested at 60-65 days of growth. The forage was ensiled in experimental PVC silos fitted with Bunsen type valves, with capacity for about 4 and 8 kg each. The treatments consisted of three types of silages (control, 5% of citric pulp and pre-wilted) with five compaction degrees (400, 500, 600, 700 and 900 kg/m³). The experimental design was random blocks, with four replicates. Citric pulp and pre-wilting increased the dry matter content of tanzania grass silages. The increased density resulted into decreases in the pH values and amoniacal-N contents; the greatest densities resulted in pH values within the ideal range. The presence of citric pulp and the pre-wilting practice reduce the losses by effluent and gas relative to the control. As the density increased, the amount of effluent increased in the control silage and decreased in silages with citric pulp.
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Authors ;Valdir Botega Tavares;José Cardoso Pinto;Antônio Ricardo Evangelista;Henrique César Pereira Figueiredo;Carla Luiza da Silva Ávila
Journal european journal of lipid science and technology
Year 2009
DOI
10.1590/S1516-35982009000100006
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000100006
Keywords
panicum maximum density pre-wiltinganimal culture

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