Variação sazonal da qualidade do leite cru refrigerado sob inspeção federal proveniente de indústrias e laticínios da região Nordeste

Abstract

The aim was to study the seasonal influence on the chemical composition, somatic cell count (SCC) and total bacteria count (TBC) in bulk tank milk in the Brazil Northeast. The data analyzed were obtained from 116.989 samples of bulk tank milk collected from industries that have an account at the Federal Inspection Service (FIS).The samples were separated into three periods (I,II,III), according in its first phase of IN-51. Was using PROC GLM to study the comparison of means by Duncan’s test and PROC CORR to analyzed the correlation coefficient (r). The fat varied more, with average of 3.66%, protein and lactose had amplitude of 0.04% between periods, and the average of 3.16 and 4.41%, respectively. Higher values of SCC were observed in the months from May to July (594.33 to 625.28 thousand cells/mL), while TBC the largest values occurring in May and June (1308.54 and 1333.83 CFU/mL). Was observed significant differences in milk components between states, especially with regard to hygienic quality. TBC showed significant and negative correlation with all constituents except fat and SCC. The chemical composition, SCC and TBC influenced between periods and months of the year.