Prevalencia de mastitis subclínica en ganado bovino lechero de la zona occidental de la provincia del Azuay

Abstract

The objective of this research is to determine the prevalence of bovine subclinical mastitis (MSC) in 4 cantons of the western part of the province of Azuay: Girón, San Fernando, Santa Isabel and Pucará, 9.652 mammary quarters of 2,413 cows belonging at 425 cattle raising were analyzed. For the assessment of the MSC, the test of california mastitis test (CMT) was performed and for interpreting the classification of Gomez, et al., (2014) was used, negative, light (+), moderate (++) and abundant (+++). In addition; analyzed the relationship of the MSC with the variables: altitude, size of the UPA, type and frequency of milking, activities pre and post-milking, grazing system, volume of production herd/day, days of lactation, age and number of childbearings. The information of the above-mentioned variables were obtained through surveys applied to owners of farms. The prevalence of MSC analyzed per cow was 42,1%. To assess total quarters was determined a 21,2% prevalence. There was no interaction (P>0,05) between the prevalence of MSC with different quarters. Significant relationship was found (P<0,05) between the prevalence of subclinical mastitis and factors: size UPA (>30 animals), grazing system (electric fence), altitude (>3000 m. s. n. m), production (>425 litres//day), stage of lactation (third third), age (>5 years), parity (>3 births), system milking (mechanical). The analysis of principal components (ACP) established 5 components that explained 61,92 % of the entire variance