Reference | Finlayson1973a (10182)

A single litter of pigs was used for each experiment. For the first 8 experiments, the test group received rations supplemented with varying maounts of chlortetracycline while control gorup received unsupplemented but otherwise identical rations. In the 9th and 10th experiments, the test groups received rations containing 40 g of chlortetracycline per ton of feed and the control gorups 20 g per ton. The closed herd on Farm E supplying the litter used in experiment 10 was maintained entirely on commercially prepared rations. Starter pellets used contained 100 g of chlortetracycline, 100 g of sulphamethazine, and 30 g of penicillin per ton. Other rations used contained 10 g of chlortetracycline per ton.

Rectal swab collected form each animal within 2 days of admission to experimental quarters. Once test and control groups had been established, additoinal similar smaples were collected twice weekly until infection. Rectal swabs were collected 6 hrs after infection, daily for 4 or 5 days, and subsequently at increasing intervals until each experiment was terminated. If available, samples of the water in the drinking troughs were collected at each visit, both before and after infection.

AST Method: None

Reference explicitly reports AST breakpoints: False

Reference reports using a MIC table: False