Durand, Anette M.; Barnard, Marie-Luise; Swanepoel, Martha L.; Engelbrecht, Marie M.; Bigalke, R.D.
(Published by the Government Printer, Pretoria., 1987)
Resistance to 20 antibiotics of 128 Salmonella and 97 Escherichia coli isolates from various registrable farm feeds was determined. A high frequency of comparatively low levels of resistance was found in both the Salmonella ...