Antibiotic Sensitivity Profiling of Subclinical Mastitis Affected Sheep and Goat in Organized Farms of Tamil Nadu, India

Mastitis is an inflammation of the mammary gland or udder. A total of 267 numbers suspected milk samples were collected recently kidded female sheep and goats, aged 3 to 4 years, maintained in organized farms across Tamil Nadu during the period from 2021 to 2024. The suspected animals were clinically examined and showed sudden swelling in both quarter of udder and unable to feed kids and some of them are hyperthermia and anorectic. Clinical examination revealed that the mammary gland as hard, swollen, and reddish in colour, milk secretions are watery and yellowish in colour in some goats, no clinical symptoms. The body temperature remained elevated, and the animals appeared dull and depressed. Some of them also showed signs of diarrhoea and metritis. The BHI, Mac Conkey, SDA, Hichrome agar, EMP agar were used for isolation of different types of bacteria. The ABST was performed with Muller Hinton agar and the affected animal milk sample showed resistance against erythromycin, ampicillin, amoxycillin and sensitive towards ciprofloxacin, ceftriazone chloramphenicol and cefotaxime, gentamicin, enrofloxacin and gatifloxacin in ABST in case of staphylococcus. The streptococcus showed sensitivity towards ciprofloxacin, gentamicin, enrofloxacin and chloramphenicol, resistance towards cefotaxime, oxytetracycline, sulphadiazine, ceftriazone.