Escore de células somáticas e sua relação com os componentes do leite em amostras de tanque no estado do paraná

Abstract

Dairy management programs have been using somatic cells score of bulk tank milk (BTSCS), being helpful evaluating the quality of the milk, making it possible to measure the maintenance of mastitis on the herd. BTSCS is the result of logarithms transformations of the somatic cells count of bulk tank milk (BTSCC). This research studied the BTSCS comportment and its relations with raw milk's fat, protein, lactose and total solids in bulk tank milk samples from milk processors of the state of Paraná, Brazil, analyzed at the Milk Quality Laboratory Analysis of the Holstein Association of Paraná, the result of technical and scientific cooperation between UFPR and McGill University of Canada. Have been analyzed 1.950.034 tank milk samples from ten regions of Paraná from January 2005 to April 2012. The BTSCS was determined by flow cytometry and percent composition by the differential absorption of infrared waves. The milk's composition is influenced by high BTSCC, which affect its quality, changing the permeability of blood vessels of the mammary gland and reducing the secretion of components of the synthesized milk (protein, fat and lactose) by the direct action of pathogens or enzymes. The estimated averages and standard deviation for BTSCC, fat%, protein%, lactose%, total solids% and age of the sample in days were: 553 ± 545 (1.000cells/mL); respectively. From the analyzed samples, 65,95% showed score 5 or less. The Pearsońs correlations between fat%, protein%, lactose% and total solids% in BTSCS, showed strong statistic evidence (P<0,01), finding the following results: 0,207; 0,029; -0,420 e 0,039 respectively.