Estudo microbiológico e composição físico-química do leite de cabra

• Ano de defesa: 2017
• Autor(a) principal: MORAES, Anidene Christina Alves de
• Orientador(a): BARBOSA, Severino Benone Paes
• Banca de defesa: GUIM, Adriana, MOURA, Andrea Paiva Botelho Lapenda de, SILVA, Elizabete Rodrigues da, SILVA, Elizabete Cristina da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural de Pernambuco
• Programa de Pós-Graduação: Programa de Pós-Graduação em Zootecnia
• Departamento: Departamento de Zootecnia
• País: Brasil
• Palavras-chave em Português: Microbiologia; Leite; Caprino
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::ZOOTECNIA
• Link de acesso: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6951

The objective of this evaluation study was to evaluate the quality of goat's milk in order to establish the best direct and indirect indications for its characterization and better understanding of methods used in the production chain for food security. The work consists of two chapters, the first is about the estimated threshold values for the total bacterial count and physicochemical composition of the milk of goats. Based on the assumption that the best quality milk has a higher concentration of physicochemical constituents, less Somatic Cell Count (CCS), total bacterial count (CBT) and they are related, two questions have been elaborated: milk quality of goat can be evaluated based on the CBT and values lower than the prefabricated by the IN 37 can be suggested as good indicative of the quality of goat's milk. In order to answer questions, the results were initially evaluated together for analysis of simple variance and correlation. The data were then classified into two classes to evaluate the best result to express an overall milk quality: ≤300x10³UFC mL or ≤500x10³UFC mL. After a statistical investigation with a total of 607 samples in nine trials, totaling 5,463 observations, the best limit with the least impairment of the physicochemical composition was ≤300x10³UFC mL. The second chapter aimed to characterize the use of CCS as a good indicator for the diagnosis of subclinical mastitis in goats and its relation with etiological agents that cause this disease. Six herds of dairy goats and 121 goat matrices were studied. The diagnosis of subclinical mastitis was statistically evaluated against the count of somatic cells and identified microbial types. Of the total of 638 samples, 246 samples (38.56%) contained microorganisms. The main types identified were 183 agents of the genus Mycoplasma spp. and 115 Staphylococcus negative coagulase. The mean CCS was 1.132x10³ cells/mL. There is no significant association between bacterial isolation and values obtained in somatic cell counts, samples with and without bacterial growth.