[Results of the intracisternal treatment of subacute and chronic mastitis in lactating cows].

In a field trial 92 lactating cows and 138 quarters affected with subacute or chronic mastitis were treated with intramammary preparations. Antibiotics were chosen in every case regarding to the antibiotic sensitivity test. The names of the preparations, their compositions and the dosages are stated in table I. Post-treatment samples were collected about 4 weeks after the treatment and a clinical investigation and CMT were made at the same time. The bacteriological cure rate was 57% and the rate of completely cured quarters (negative CMT and clinical findings) was 35% for all infections. The cure rate was 43% and 18%, respectively, in 40 cases of infections when S. aureus was the cause. For the streptococcal mastitis, a total of 57 quarters, the cure rate was 65% and 53%, respectively. The cure rates for different infection agents are seen in table II and for different antibiotics in table III.