Correlation between somatic cell count and chemical composition of cooled raw milk in properties of Rio Grande do Norte, Brazil

Abstract

Due to the damage caused by subclinical mastitis in loss of production and quality of milk, the present study aimed to verify the correlation between somatic cell count (SCC) and the chemical composition of cooled raw milk collected in the Agreste region of Rio Grande do Norte, Brazil, in drought and rain seasons. Samples were collected in seven dairy farms during morning time, between January 2010 and March 2012, and sent to the Brazilian et of Milk Quality Laboratory (ESALQ/USP). The contents of protein, fat, lactose, casein, total solids, nonfat dry extract and urea nitrogen, besides of SCC and total bacterial count were performed. Data were submitted to analysis of variance, correlation analysis and comparison of means by Tuckey test , 5%. The average SCC was 604,000 cells/mL and had significant variation in the dry period (558 000 cells/mL) and rainy (650 000 cells/mL). The SCC was positively correlated with fat and total solids but negatively with the lactose cow’s milk of bulk tank, regardless of the season in the Agreste of Rio Grande do Norte.