Uso de vácuo e inoculante na produção de silagem de capim-Tifton 85

• Autor(a) principal: Weirich, Daiane Thais
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNIOESTE
• Texto Completo: http://tede.unioeste.br:8080/tede/handle/tede/1558
• topic: Ácidos orgânicos; Bactérias; Fermentação; pH; Organic acids; Bacteria; Fermentation; pH; CIÊNCIAS AGRÁRIAS:ZOOTECNIA

The objective was to evaluate the chemical composition, the fermentation profile, microbiological profile and aerobic stability of Tifton 85 silage with 28 days of silage, produced with vacuum and without vacuum, with or without microbial inoculant. The experimental design was completely randomized in a 2x2 factorial arrangement (whether or not the vacuum and inoculant application), with five replications. The inoculant consisted of lactic acid bacteria (LAB): Lactobacillus acidophilus at a concentration of 3 x 109 CFU ml-1 viable cells per ml of the product. The variables for the chemical composition were: dry matter (DM), mineral matter (MM), crude protein (CP), neutral detergent insoluble protein (NDIP), acid detergent insoluble protein (ADIP), neutral detergent fiber (NDF), acid detergent fiber (ADF), soluble carbohydrates (CHO'S) total carbohydrates (total CHO'S), ether extract (EE) and lignin. The pH and ammonia nitrogen (NH3/Total N) were evaluated before ensiling and after opening the silage. The organic acids (lactic, acetic, propionic and butyric) were quantified after the silo opening. In the microbiological profile, after the silage opening, it was counted by culture medium of the population of Clostridium, Bacillus, Enterobacteriaceae, lactic acid bacteria, yeasts and fungi. The aerobic stability was evaluated by the opening on the sixth day of the silage exposure to oxygen. The DM, CP, MM, lignin and NH3/total N content did not differ between treatments and the concentrations of NH3/total N were low (average of 71.7 4g kg-1). The use of vacuum and inoculant had higher levels of soluble CHO'S (23.48 g kg-1). NDF, ADF, cellulose and ADIP contents were lower in treatments without inoculation with vacuum. The ADF and cellulose content were lower when using the inoculant without vacuum. The values of organic acids were low for lactic and acetic acid and within levels recommended for propionic and butyric. The pH values were lower with vacuum use, however above the ideal value for a good preservation of the silage (4.2) in all treatments, with quadratic behavior. There was no variation in the population of lactic acid bacteria between treatments. The Bacillus population was lower with the use of vacuum. The population of Clostridium reduced with the use of inoculant with vacuum compared to the one without vacuum. The population of yeast tended to linear growth in all evaluated treatments from the first to the sixth day of exposure to oxygen and consequently the increase of temperature that showed a quadratic behavior. There was no growth of fungi in the silage during the period of exposure to oxygen. The breaking of aerobic stability occurred from the 3rd day after opening the silage. The use of vacuum and inoculant are alternatives which can be used in the production of silage Tifton 85, since they promote greater drop in pH, accelerate the aerobic phase reducing consumption of carbohydrates and increases the population of lactic acid producer bacteria, thus improving the fermentation and microbiological profile, and reducing fiber content with slow degradation of the rumen, improving the chemical composition