Comparative Studies on Clinical and Subclinical Mastitis in Dairy Cattle

Abstract

This study was carried out in separate farms from different localitions in the governorates of El-Fayoum, Giza, Esmailia, Alexandria and El-Sharkia. The aim of this work is to study more about bovine mastitis and to determine the different risk factors provoke mastitis and the most common pathogen causing such problem, as well as phenotypic and genotypic assessment of their antimicrobial resistance profile and the comparison between them. In addition, the detection of multidrug resistance profile of the various pathogens and their relationship to the drugs used in treatment protocol of each farm. In this study, the minimum inhibition concentration (MIC) was performed on the milk itself as in vivo study. The results revealed that: A total of 295 potential pathogens causing IMI isolated from 265 milk samples. A field study was conducted on 265 infected cows. Twenty cows exhibit CM, nine of them with bloody milk and10 with yellowish milk and only one cow has gangrenous mastitis, and 245 lactating cows with SCM. The prevalence of clinical and sub-clinical mastitis was 10.14% and 69.35% respectively. Bovine mastitis risk factors were analyzed through statistical analysis which revealed that the prevalence of clinical and sub-clinical mastitis is significantly different between different months (p value < 0.05). For clinical mastitis, the OR is significantly higher in October 2020 than in March 2020. For sub-clinical mastitis, the OR is significantly higher in November 2019 and October 2020 than March 2020. On the other hand, there is no significant impact for cow’s number of parities and lactation stage on both clinical