Published online by Cambridge University Press: 15 May 2009
The use of 1 per cent, milk agar gives a significant increase in colony numbers for both raw milk and pasteurised milk at all levels of count. There is a marked increase with pasteurised milk on the 1/100 and 1/1000 plates. Milk agar also gives better colony growth, tending to more rapid and accurate counting. With raw milk there is no correlation between the increase and the count on standard agar.