[Trial of kormogrisein-40 as a growth stimulant in pigs]

An experiment was carried out with 36 pigs, weighing 8 to 70 kg, divided into 4 groups to test the growth-promoting effect of kormogrisin-40 given with the feed. The animals were fed on one and the same standard combined feed--a basic ration to which antibiotics were added in the form of a premix as follows: group I (controls); group II--zinc-bacitracin in conc. of 40 ppm; group III--grisin in conc. of 5 ppm; and group IV--grisin in conc. of 12 ppm. It was ascertained that growth stimulation was best manifested with group IV--the average daily gain increased by 17 per cent, and the consumption of feed per kilogram of gain decreased by 13.2 per cent. Second in effect ranked group III--13.0 and 9.6 per cent respectively. When concentrations of 5 and 12 ppm of grisin were used with pigs, and these were slaughtered without observing any withdrawal times there were residual amounts of the antibiotic in the meat and the parenchymal organs.