943 resultados para Estabelecimentos comerciais
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Over the past few years, the area of planted forests has expanded considerably in Brazil, reaching a level of 6.3 million hectares, which represents approximately 0.7% of the country, mainly with some species of the Eucalyptus genus. However, due to the global concern with biological invasions by exotic species, risk assessment is necessary to evaluate the potential of Eucalyptus species escaping cultivated stands and invading surrounding native ecosystems. Seedlings by natural regeneration from Eucalyptus grandis and E. urophylla, pure and hybrids between the two species were evaluated, by assessing natural regeneration of Eucalyptus in 18 sites located in Brazilian states with plantation forest tradition (Minas Gerais, São Paulo, Rio Grande do Sul and Espírito Santo). Sample plots were installed in the planted stands, along forest roads and in a nearby pasture or native vegetation.,at different distances from the Eucalyptus stands. Regeneration of Eucalyptus was not recorded in 90% of the plots installed outside the eucalipt stands. However, seedlings of eucalypts were observed in 29% of the plots within the commercial stands (mean density of 37 seedlings per hectare) and 40% of the plots located along forest roads (157 seedlings per hectare on average), but no adult plants by natural regeneration were found. The seedlings of eucalypt species studied rarely were found beyond the limits of the cultivated areas. In the planted stands or along forest roads, eucalypts can germinate, but the seedlings apparently do not establish. So the potential for invasion by seeds produced in commercial plantations of Eucalyptus is low.
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Pós-graduação em Engenharia de Produção - FEG
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Pós-graduação em Engenharia de Produção - FEG
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A energia é o item mais dispendioso na formulação de rações para poedeiras. A inclusão energética em níveis elevados resulta, além de gastos excessivos, no aumento da mortalidade e na redução do desempenho das aves. Via de regra, os manuais das linhagens e as recomendações propostas por tabelas desenvolvidas por instituições de pesquisa, não atendem em sua totalidade a demanda real das granjas produtoras de ovos. Desta forma, medidas que visem adequar as condições de criação às exigências nutricionais das poedeiras são almejadas a todo instante, resultando na aproximação entre a formulação das dietas e as exigências das poedeiras.