Viabilidade da utilização de aditivos na ensilagem de capim-braquiarão (Brachiaria brizantha (Hochst ex A. Rich.) Stapf cv. Marandu), manejado sob intensidades de pastejo / Viability on the addictives utilization in braquiarão grass [Brachiaria brizantha (Hochst ex A. Rich.) cv. Marandu] silage process, managed under grazing intensities

Felipe Barros Macedo

Silage is a grassing food conserved by a fermentative process specialy used during scarcity period (dry season). It aims to conserve a high nutritional value with a minimum of losses. In order to assure its produced forage utilization efficiency, it needs to considerate its harvest by animals and machines in a system that uses rotational stocking method. In this context, this work has had as objectives: to evaluate the viability to produce braquiarão grass silage [Brachiaria brizantha (Hochst ex A. Rich.) cv. Marandu] from pasture under grazing intensities, using addictives or not. To determinate the gases and effluent losses and, to verificate the possible differences in chemical-bromatologic composition in the silage related to the strategies to process the silage that the producer is able to use, at the beginning or at the end of summer season (rain period). The experiment was conducted in the Animal Science Department at the Faculty of Animal Science and Food Engeneering of University of São Paulo FZEA/USP. The experimental design was totally alleatory in a 4X3 factorial mode, with four replications. The factors were: 1st Factor Forage allowance (FA) (5% - 5Kg of dry mass/ 100kg living animal weight.day, 10%, 15% and 20%). The pasture was being managed in rotational stocking method, with a 35 day grazing cycle (7 day animal occupation time and 28 day pasture rest time); 2nd Factor addictive A) Control without peletized citric pulp and inoculant. B) 7,5 % peletized citric pulp (75 Kg/ton of forage). C) Sil-All C4 inoculant Trading recommendation: 250 g of the product in 50 liters of potable water; pulverizing 1 liter/ton. The experiment were composed by 48 small plastic silos parcels ( 12 treatments X 4 replications) for each grazing cycle, that was used the forage harvest (1st 23/02/04 and 2nd 27/03/04). The gases and gases+effluent losses were evaluated during the fermentative process and, the silage chemical-bromatologic characteristics. The braquiarão grass conservation process, in a property that uses animals handled in a rotational stocking method, can be installed through forage mechanical cuts in strategically chosen pickets. In lower grazing intensities the braquiarão grass shows better characteristics to ensile, once it´s important to the forage used in grazing process to have a potential to high mass production just like its dry matter rate, that can decrease the expense per unit of area and it guarantees the final product quality. In tropical forage harvest with high humidity and low fermentable carbohydrate rate, the addictives utilization is a feasible and necessary method to increase the dry matter and fermentable carbohydrate rate and keep the buffering in low rate (citric pulp) or in microorganisms (Sil-All C4) to collaborate the fermentative process in order to obtain better nutritional value silage.

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