Qualidade do leite em diferentes sistemas de produção, anos e estações climáticas no noroeste do Rio Grande do Sul

• Ano de defesa: 2011
• Autor(a) principal: Milani, Marceli Pazini
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; BR; Ciência e Tecnologia dos Alimentos; UFSM; Programa de Pós-Graduação em Ciência e Tecnologia dos Alimentos
• Palavras-chave em Português: Bovinos; Composição do leite; Instrução Normativa 51; Nível tecnológico; Qualidade higiênico sanitária; Variação sazonal; Dairy cattle; Milk composition; Normative Instruction 51; Hygienic sanitary quality; Seasonal variation; Technology levels; CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS
• Link de acesso: http://repositorio.ufsm.br/handle/1/5711

The objective was to evaluate the milk quality coming from Region Northwest Rio Grande Sul, under different technology levels, from October 2007 to September 2010, at different seasons. The variables were fat, protein, lactose, total solids, somatic cell count (SCC) and total bacterial count (TBC) of milk. Data were analyzed using mixed model with repeated measure data, having the effect of fixed production system, years and seasons, and random effect dairy farm designated in each production system. The results were compared with the standard required by Normative Instruction 51 (NI 51) of 18 September 2002 (Minisério da Agricultura, Pecuária e Abastecimento). There were significant differences between the systems of production for fat and total bacterial count milk, with higher values in non specialized system. All variables were influenced by season, featuring in the autumn, fat, protein, total solids and higher TBC. The lactose content was influenced by the production system, presenting the most specialized and smaller in the not specialized, and the season, being higher in winter and lower in autumn. There was a high percentage of samples in disagreement with the NI 51 to TBC and SCC, especially those belonging to dairy farm partially and not specialized.