STUDIES ON COMPARATIVE INCIDENCE OF SUB-CLINICAL AND CLINICAL MASTITIS AND IN VITRO ANTIBIOTIC SUSCEPTIBILITY OF ISOLATES FROM HOLSTEIN-FRI ESIAN AND JERSEY COWS AND BUFFALOES

I. A. Zahid

Research Institute for Physiology of Animal Reproduction, Bhunikey (Pottoki), District Kasur, Pakistan

Abstract   

    Data concerning sub-clinical and clinical mastitis in Hoistein-Friesian, Jersey cows and boffaloes available for the period from July, 1986 to June, 2002 at Microbiology Division of the Directorate of Research Institute for Physiology of Animal Reproduction Bhunikey (Pattoki) District Kasur were analysed. Year-wise incidence of sub-clinical mastitis in Holstein-Friesian cows was 5.54 to 56.60%. This breed showed 13.19% overall incidence of sub-clinical mastitis, lowest incidence was in the year 1998-99 while it was highest in the year 1989-90. The corresponding values for Jersey cows were 5.93 to 33.73%, 12.89%, years 1995-96 and 1989-90. Lactation-wise incidence of sub-clinical mastitis in Hoistein-Friesian cows was 8.33 to 21.90%, with lowest value in 10th lactation, while it was highest in 6th lactation. The corresponding values for Jersey cows were 10.26 to 41.56%, 1st and 7th lactations. Season-wise incidence of sub-clinical mastitis in Holstein-Friesian cows was 6.87 to 16.68%, lowest incidence was in dry hot season, while it was highest in autumn season. The corresponding values for Jersey cows were 8.57 to 16.55 per cent, dry hot and humid hot seasons. Year and season wise frequency of cases of clinical mastitis in buffaloes were 0.17 to 17.03%, lowest numbers of cases were in the year 1992-93, while these were highest in the year 2001-02. Season-wise cases of clinical mastitis in buffaloes were 11.90 to 31.72%, lowest frequency of cases was in dry hot season, while it was highest in humid hot season. Gentamycin showed the highest values of sensitivity for mastitis milk sample cultures of Holstein-Friesian cows and buffaloes (37.22 and 44.93%, respectively). Kanamycin gave the highest values (25.32%) of sensitivity for mastitic milk sample cultures of Jersey cows, It is concluded that years, seasons as well as lactation number showed their effect on incidence of sub-clinical and clinical mastitis in cattle and buffaloes. Gentamycin and kanamycin were found the drugs of first choice on the basis of drug sensitivity tests for the treatment of clinical mastitis in Hoistein-Friesian and Jersey cows and buffaloes, respectively.

Key words: Sub-clinical and clinical mastitis, Hoistein-Friesian Jersey cows, buffaloes, year, season, lactation.