KEYWORDS
Metabolism Lipids Serum Glucose Plasma
PALAVRAS-CHAVE Metabolismo Lipídios Soro Glicose Plasma
ABSTRACT:The purpose of this study was to analyze the influence of lactation and dry period in the constituents of lipid and glucose metabolism of buffaloes. One hundred fortyseven samples of serum and plasma were collected between November 2009 and July 2010, from properties raising Murrah, Mediterranean and crossbred buffaloes, located in the State of Sao Paulo, Brazil. Biochemical analysis was obtained by determining the contents of serum cholesterol, triglycerides, beta-hydroxybutyrate (β-HBO), non-esterified fatty acids (NEFA) and plasma glucose. Values for arithmetic mean and standard error mean were calculated using the SAS procedure, version 9.2. Tests for normality of residuals and homogeneity of variances were performed using the SAS Guide Data Analysis. Data were analyzed by ANOVA using the SAS procedure Glimmix. The group information (Lactation), Farm and Age were used in the statistical models. Means of groups were compared using Least Square Means (LSMeans) of SAS, where significant difference was observed at P ≤ 0.05. It was possible to conclude that buffaloes during peak lactation need to metabolize body reserves to supplement the lower amounts of bloodstream lipids, when they remain in negative energy balance. In the dry period, there were significant changes in the lipid profile, characterized by decrease of nutritional requirements, with consequent improvement in the general conditions of the animals.
RESUMO: Com o objetivo de se analisar a influência da lactação e do período seco nos constituintes do metabolismo lipídico e na glicemia de búfalas leiteiras, foram coletadas amostras de soro e plasma de 147 animais, entre novembro de 2009 e julho de 2010, sendo estes oriundos de propriedades criadoras de búfalos das raças Murrah, Mediterrâneo e Mestiços, localizadas no Estado de São Paulo. A análise bioquímica foi obtida por meio da determinação dos teores séricos de colesterol, triglicérides, ß-hidroxibutirato (ß-HBO), ácidos graxos não esterificados (NEFA) e teores plasmáticos de glicose. Os valores da média aritmética e o erro padrão da média foram calculados utilizando-se o procedimento