Health
expenditures are lower, average weight gains
are higher, and gross margin is increased
by $8.13 per calf fed pasteurized waste milk,
compared with calves fed nonpasteurized waste
milk.
" Waste
milk that has not been treated (by pasteurization,
for instance) before being fed to calves may
contain high numbers of pathogenic bacteria
that can adversely affect calf growth. "
Results show that Johne's disease is indeed
costly to dairy producers. "For positive Johne's
disease herds with less than 10 percent of cull
cows reported showing clinical signs consistent
with Johne's disease, adjusted
annual value of production was $40 per cow lower
than Johne's negative herds with no reported cull
cows with clinical signs. For positive Johne's
herds with 10 percent or more cull cows reported
showing clinical signs, the economic impact was
$227 per cow." These losses are applied to
every cow in the herd, not just the infected ones
Results from M. paratuberculosis heat inactivation
experiments when the lab-scale pasteurizer
method was used indicated that both strains
of M. paratuberculosis tested, 19698 and Ben,
at a concentration of either 104 or 106 CFU/ml
were effectively inactivated after treatment
at 72°C for 15 seconds ... Studies conducted
in our laboratory with the lab-scale industrial
pasteurizer unit have demonstrated that turbulent
flow of milk during pasteurization is essential
for complete killing of contaminating M. paratuberculosis.
This seems rational since organisms may clump
more readily in a static environment than
in a nonstatic environment and may protect
themselves from heat penetration.
