Composição química, caracterização e quantificação da população de microrganismos em capim-elefante cv. Cameroon (Pennisetum purpureum, Schum.) e suas silagens

Pereira, Odilon Gomes; Rocha, Karina Dosualdo; Ferreira, Célia Lúcia de Luces Fortes

doi:10.1590/s1516-35982007000800006

Cited by 32 publications

(31 citation statements)

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“…There was a reduction in the population of fungi and yeasts during the fermentation process in both forage species, with an average 2.08 and 2.16 log cfu/g in the silages of signalgrass and Mombasa grass, respectively. These values are similar to those found by Pereira et al (2007) in the silage of elephant grass (3.25).…”

Section: Resultssupporting

confidence: 90%

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The chemical composition, fermentation profile, and microbial populations in tropical grass silages

et al. 2013

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-The objective of this study was to evaluate the fermentation profile, chemical composition and microbial population and losses in the silages of signalgrass and Mombasa grass fertilized with the following levels of nitrogen (N): 0, 30, 60 and 90 kg/ha. The grasses were harvested at 70 days of regrowth, chopped and then ensiled in laboratory silos that had 20 kg of capacity and a snap-top cover and were fitted with Bunsen valves. Before ensiling, samples of the plants were used for the isolation and identification of lactic acid bacteria (LAB) in epiphytic microbiota. The design adopted was a 4 × 2 factorial arrangement, with four doses of N and two forage species, in a completely randomized design, with four replicates. The predominant species of LAB was Lactobacillus fermentum. The interaction between the N dose and forage species affected the dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and water soluble carbohydrates (WSC) of the silages. The pH values and gas losses were influenced only by the forage species, with higher values for the Mombasa grass. For the ammonia (NH 3 -N) levels and effluent losses, there was an effect of the interaction between the forage species and N doses, and the highest values of NH 3 -N and effluent losses were found in the Mombasa grass silage fertilized with 60 kg N/ha. Nitrogen fertilization reduces the levels of DM and WSC in the silages and also increases the levels of CP, NH 3 -N and effluent losses.

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Section: Resultssupporting

confidence: 90%

“…In other studies, Pereira et al (2007), assessed the populations of lactic acid bacteria in plants of elephant grass cv. Cameroon and identified the isolates as Lactobacillus casei ssp.…”

Section: Resultsmentioning

confidence: 99%

The chemical composition, fermentation profile, and microbial populations in tropical grass silages

et al. 2013

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“…Pereira et al (2007) did not record this kind of bacteria group from the 7th to the 28th day of fermentation in silages of elephant grass treated with bacterial-enzymatic inoculant and the same was observed by Bernardes et al (2005), who did not detect presence of microorganisms in silages of Brachiaria brizantha with addition of pelletized citrus pulp from the 4th day. The population of lactic acid bacteria was constant in all studied treatments, but at total count, it was found that during the pre-drying in the sun, there was a higher development of microorganisms (Table 1).…”

Section: Resultssupporting

confidence: 62%

Microbiological profile and aerobic stability of Tifton 85 bermudagrass silage with different additives

Neres¹,

Zambom²,

Fernandes³

et al. 2013

R. Bras. Zootec.

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-The objective of this study was to evaluate the microbiological profile and aerobic stability of silage with Tifton 85 bermudagrass and different additives and wilting. The studied treatments were: pre-drying in the sun for two hours before ensiling; use of bacterial-enzymatic inoculant; addition of soybean peel; addition of corn grits and use of salt in the surface layer of the silo. The experimental design was completely randomized with six treatments and four replications. Plants of Tifton 85 bermudagrass with 38 days were ensiled in experimental silos with Bunsen valves, with compacting density of 236 kg silage per m 3 for Tifton 85 bermudagrass, which was pre-dried in the sun; the average silage was 294 kg m -3 for the other treatments. The ratios between soybean hulls and corn grits, added to the silage, were calculated based on the initial DM content from Tifton 85 bermudagrass in order to obtain 320 g/kg DM of the material to be ensiled. There was an increase of lactic bacteria and Clostridium as well as an absence of enterobacteria after the silo opening. Fungi developed only in Tifton 85 bermudagrass and its treatments before the ensilage and yeasts developed in silages of Tifton 85 bermudagrass when they received soybean hulls or corn grits after silo opening. There was no breach regarding aerobic stability of silages during the studied period. The pH reached the highest values within 48 hours after opening the silos, but there were variations during this period.

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“…Thus, the present study and other studies with tropical grasses (Santos et al, 2011;Pereira et al, 2007) have shown that the soluble carbohydrates present in plant tissue enable the development and predominance of LAB, resulting in a quick decline of the pH values and consequent inhibition of undesirable microorganisms. The silage pH values ranged (P<0.05) with the different cutting heights (Figure 2).…”

Section: Resultssupporting

confidence: 64%

Microbial and fermentation profiles, losses and chemical composition of silages of buffel grass harvested at different cutting heights

et al. 2013

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-The present study evaluated the microbial population, fermentation profile, losses and dry matter recovery, and chemical composition of silages of buffel grass at different cutting heights. To evaluate the microbial fermentation dynamics, the treatments resulted from a 4 × 5 factorial combination consisting of 4 cutting heights and 5 fermentation periods, in a completely randomized design with three replications. The fermentation was evaluated at the end of 1, 3, 7, 15 and 30 days. The other characteristics of silages with 30 days were evaluated following a completely randomized design with four treatments, consisting of 4 cutting heights (30, 40, 50 and 60 cm), and five replications. Fermentation period and cutting height effects and interaction between both factors were observed on the populations of lactic acid bacteria (LAB), enterobacteria and molds and yeasts. The peak of development of LAB populations was observed on the seventh day of fermentation for the heights of 40 and 50 cm, with 8.25 and 8.30 log cfu/g, respectively. The pH values of silages ranged with different cutting heights, in which at the height of 50 cm the decrease was most pronounced. However, the pH values were similar between the cutting heights at the end of 30 days of fermentation. Quadratic relationship was observed between lactic acid concentrations and cutting heights. The crude protein content behaved linearly, initially showing 128.5 g/kg DM at 30 cm, decreasing as the cutting heights increased. The neutral detergent fiber and ether extract contents increased linearly with the cutting heights. Based on microbial populations, fermentation, losses and chemical composition, it is recommended to harvest buffel grass for silage from 50 cm on.

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Composição química, caracterização e quantificação da população de microrganismos em capim-elefante cv. Cameroon (Pennisetum purpureum, Schum.) e suas silagens

Cited by 32 publications

References 10 publications

The chemical composition, fermentation profile, and microbial populations in tropical grass silages

The chemical composition, fermentation profile, and microbial populations in tropical grass silages

Microbiological profile and aerobic stability of Tifton 85 bermudagrass silage with different additives

Microbial and fermentation profiles, losses and chemical composition of silages of buffel grass harvested at different cutting heights

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