Efeito da compactaÃÃo na qualidade e estabilidade aerÃbia da silagem de capim-tanzÃnia / Effect of compaction on the quality and aerobic stability of Tanzania grass silage

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The presence of oxygen, by the entrance of air during the storage process or at the opening of the silo, favors the growth of aerobic microorganisms. The greatest penetration of air in silage takes place when imperfect compactions of the ensiled mass are applied. The objective of this wok was to evaluate and the effect o different degrees of compaction on the quality and aerobic stability of Tanzania grass silage submitted to different making processes. The experiment was conducted in the dependencies of the Animal Science Department of the UFLA, by utilizing Tanzania grass (Panicum maximum Jacq. cv. TanzÃnia I) harvested at 60-65 days. The forage was ensiled in experimental PVC silos fitted with Bunsen type valves, with the capacity for about 4 and 8 kg each. The treatments consisted of three sorts of silages (control, with 5%citric pulp and pre-wilted), with five degrees of compaction (400, 500, 600, 700 and 900 kg/m3). The experimental design utilized was that of randomized blocks with two replicates in split plot scheme, the factors of the plot being the silages and of the subplots the densities. The increase of the density resulted into decreases in pH values and contents of amoniacal-N; the greatest densities presented 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 was increased, there was an increase in the amount of effluent and decrease in the losses by gas in the citric pulp silages and control. The silages with densities 400 and 500 kg/m to which were added citric pulp were less stable than the others, accompanied by the control and pre-wilted silages at the same densities. The presence of the additive citric pulp at the densities 400 e 500 kg/mÂ, resulted into a increase of temperature relative to the other silages in the aerobic stability. 1 Guidance committee: Josà Cardoso Pinto (Adviser); Henrique CÃsar Pereira Figueiredo Augusto Ramalho de Morais.

ASSUNTO(S)

prÃ-emuchecimento effluent citric pulp gas efluente pre-wilted zootecnia polpa cÃtrica gÃs

ACESSO AO ARTIGO

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