Biomedical subjects
Publications and source records attributed to F D Barnes.
Milk samples for aerobic culturing were collected from 72 quarters of cows with clinical mastitis that had been nonresponsive to antimicrobial intramammary treatment. All samples were collected within 24 hours of the most recent treatment. Mastitis pathogens were isolated from 56 samples (78%).
Lactating dairy cows (487) from five commercial herds were in a study of benefits from lactation therapy of sub-clinical mastitis. Bacterial isolations and composite milk samples for somatic cell counts were taken from each cow each month for 15 mo. Cows (254) in the experimental group were infused with cephapirin in all quarters for two consecutive milkings if somatic cell counts rose above 400,000 cells/ml; 103 cows were so treated. Stepwise regression showed that lactation number, somatic cell counts, days in milk, and percent quarters infected explained variation in milk production, but treatment group, herd, and season did not. Also, there were no significant differences between production of infected experimental and control cows with high somatic cell counts on test dates after treatment. With the experimental program, there was a net loss of +19.65/cow. Intramammary lactation therapy based on somatic cell counts less than 400,000 cells/ml is not recommended.
Mastitis in its complexity has managed to forestall all efforts of eradication in spite of years of research, antibiotics and practical control measures. This minisymposium will touch on seven topics current to treatment and control of this economically important disease.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.