Ocorrência de leite instável na região semiárida do Rio Grande do Norte e sua correlação com a qualidade do leite

dc.contributor.advisorRangel, Adriano Henrique do Nascimento
dc.contributor.advisorIDpt_BR
dc.contributor.advisorLatteshttp://lattes.cnpq.br/9757343999118047
dc.contributor.authorFaria, Priscilla Fernandes de
dc.contributor.authorIDpt_BR
dc.contributor.authorLatteshttp://lattes.cnpq.br/9194234931895782
dc.contributor.referees1Macedo, Cláudia Souza
dc.contributor.referees1IDpt_BR
dc.contributor.referees1Latteshttp://lattes.cnpq.br/5335251554582575
dc.contributor.referees2Lima Júnior, Dorgival Morais de
dc.contributor.referees2IDpt_BR
dc.contributor.referees2Latteshttp://lattes.cnpq.br/9054517540280709
dc.contributor.referees3Urbano, Stela Antas
dc.contributor.referees3IDpt_BR
dc.contributor.referees3Latteshttp://lattes.cnpq.br/4735195863891753
dc.date.accessioned2016-06-20T19:25:08Z
dc.date.available2016-06-20T19:25:08Z
dc.date.issued2015-08-05
dc.description.abstractThe unstable non acid milk (UNAM) is characterized by coagulation in the alcohol test and wanted acidity (14-18°D). Among Brazilian regions, the South and Southeast have the highest occurrence of LINA, which has been causing problems for both producers and for industries, due to the disposal or undervaluation of milk. In the Northeast there are few studies that indicate their occurrence and quality. The objective of this study was to identify the occurrence of unstable non-acid milk in the west and central mesoregions of Rio Grande do Norte, determine their physicochemical characteristics, test alcoholic graduations and evaluate their correlation with the quality of milk. 176 raw milk samples were analyzed in the period from September to December /2014 from 23 APASA’s cooling tanks, located in 7 cities of west and central mesoregions RN. The samples were collected in duplicate, one sample used for alcohol testing at 68, 72 and 76%, measurement of pH, acidity, electrical conductivity and boiling proof, made in LABOLEITE / UFRN; and the other sample containing Bronopol® preservative, was sent to the APCBRH (Cattle Breeders Association Paranaense Holstein) laboratory in Curitiba-PR, which were analyzed fat, protein, total solids, lactose, casein, urea nitrogen and somatic cell count. The test alcohol samples disapproved 31.82%, of which 30% proved to be non-acid, and 30% had high acidity. The samples were divided into three classes: Stable Milk, UNAM and acid milk. 3% Tukey test was used for comparison of stable milk components and UNAM and there was no significant difference between them. Both classes obtained averages within the standard required by IN 62. The average value of electric conductivity was 4.84 mS/cm for stable milk, 4.55 mS/cm for unstable and acid milk and 4.53 mS/cm for non-acid unstable milk. The electrical conductivity was positively correlated with alcohol stability of milk and negative correlation with acidity and pH. Could not observe direct relationship between the electrical conductivity and the somatic cell count.The boiling test was negative for all samples UNAM. It can be concluded that the incidence of UNAM in the studied region is low, although the predisposing factors such as heat stress, drought and nutritional deficiency. In conclusion, the UNAM has quality similar to stable milk, conform the norms required by Agriculture Ministry, and with adequate thermal stability, which proves that there is no reason to reject this milk by industry.pt_BR
dc.description.resumoO objetivo deste trabalho foi identificar a ocorrência de leite instável não ácido nasmesorregiões oeste e central do Rio Grande do Norte, bem como avaliar a qualidade doleite. Foram analisadas 92 amostras, ao longo de 4 meses, provenientes de 23 tanques deresfriamento. Foi realizado o teste do álcool a 68%, 72% e 76%, além da mensuração dopH, acidez, gordura, proteína, sólidos totais, nitrogênio ureico, lactose, caseína e contagemde células somáticas. A incidência de LINA foi de 15,91%, e não houve diferençasignificativa na composição do LINA em relação ao leite estável em nenhuma dasgraduações alcoólicas. Nenhuma amostra de LINA apresentou coagulação na prova dafervura. Tais resultados permitem concluir que apesar das inúmeras adversidades climáticase nutricionais existentes na região, o LINA não representa um problema aparentept_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)pt_BR
dc.identifier.citationFARIA, Priscilla Fernandes de. Ocorrência de leite instável na região semiárida do Rio Grande do Norte e sua correlação com a qualidade do leite. 2015. 75f. Dissertação (Mestrado em Produção Animal) - Universidade Federal do Rio Grande do Norte, Universidade Federal do Rio Grande do Norte, Natal, 2015.pt_BR
dc.identifier.urihttps://repositorio.ufrn.br/jspui/handle/123456789/20740
dc.languageporpt_BR
dc.publisherUniversidade Federal do Rio Grande do Nortept_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.initialsUFRNpt_BR
dc.publisher.programPROGRAMA DE PÓS-GRADUAÇÃO EM PRODUÇÃO ANIMALpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectÁlcoolpt_BR
dc.subjectAcidezpt_BR
dc.subjectAnálise físico-químicapt_BR
dc.subjectCaseínapt_BR
dc.subjectCondutividade elétricapt_BR
dc.subjectEstabilidade térmicapt_BR
dc.subject.cnpqCNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMALpt_BR
dc.titleOcorrência de leite instável na região semiárida do Rio Grande do Norte e sua correlação com a qualidade do leitept_BR
dc.typemasterThesispt_BR

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