There will always among the suppliers of a dairy be one or more farmers who have a highly
tuberculosis stock, one or more cows which yield in the course of the year great quantities
of infected milk, and so, by employing this milk, after it has been skimmed, to feed other
stock, the infection is spread to hitherto healthy herds. This was formerly done on a
larg« scale, and there is no doubt that most stocks of cattle and pigs in Denmark would
gradually be infected in this way. if measures had not been taken to prevent it. Of course
the heating of the whey ought to have been enforced by law as well; this was proposed
but the proposal was not accepted, chiefly because the heating of the whey is rather trouble-
some. It is, however, to be hope that this measure will be carried out some day, though



49

as whey is mostly used for feeding pigs, it is not so important as the other dairy products,
as regards bovine tuberculosis, and besides, cheese-making is not nearly so considerable in
Denmark as butter-making.
