Estudo retrospectivo de fatores que promovem a qualidade do leite em um sistema intensivo de produção a pasto

Abstract

Mastitis is an inflammatory reaction of the parenchyma of the mammary gland, responsible for several physical-chemical changes of the milk and also modifications of the glandular tissue of the udder. Because it affects the health of the udder and the production of milk, it is the disease of the dairy cattle herd that brings more economic damages to the sector. Therefore, a retrospective study was carried out of factors that promote milk quality in an intensive pasture production system. For this purpose, data on the health of the mammary gland of Holstein, Jersey and Kiwicross cows kept on pasture for one year and the quality of this milk (standard plate count – SPC; somatic cell counts – SCC and temperature variation in a expansion) for six months in an Ag-industry of type A milk. The cows were milked twice a day, according to their category: high, medium and low production lot and animals with mastitis, obeying the appropriate hygienic-sanitary criteria. It can be noticed that the maximum percentage of occurrence of mastitis affected in the present study was 6.03%, in March 2018. There was a lower percentage of mastitis in the months of May to October, which correspond to dry period, which is due to the low incidence of infection. Mastitis rate 6.03%, maximum SCC 267,300 cells/mL, maximum SPC 9.85 and maximum expansion tank temperature 4.30°C. Based on the results of this survey, it can be stated that the hygienic-sanitary management of the herd associated with the pasture system was sufficient to control the clinical and subclinical mastitis in this herd.