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Observations on the Infusion of Penicillin in the Mammary Gland of the Goat

University of Illinois, Urbana

ABSTRACT

The problem of antibiotic adulteration in milk has been studied in considerable detail in the dairy cow. Existing data on the cow have been the standard for producers of goat milk, despite the known and unknown differences between the two genera (5).

An udder infusion study was conducted in the University of Illinois dairy herd with 20 French Alpine dairy goats to determine: (1) The persistence of penicillin following intramammary infusion, 2) the effect of standard oil or water-base materials, 3) if differences exist between early and late lactation, and 4) if there is a transfer of penicillin from the treated to the untreated half of the udder.

The does represented various ages (1 yr. 10 mo. to 6 yr. 10 mo.), stages of lactation (17 days to 259 days post-partum), and production levels (1.6 to 9.6 lb. per day). Each doe was checked and found to be producing normal milk and was negative for antibacterial substances in the milk as shown by the disc assay test (3).

¹ Department of Dairy Science.

² College of Veterinary Medicine.

³ Department of Food Technology.