Current through Register Vol. 41, No. 14, April 7, 2022
If infection is disclosed in swine herds, one of the following
plans should be selected for eradicating the disease and for subsequent
qualifying the herd for validated brucellosis-free status, if desired. Infected
herds under test for area validation status should also choose one of these
plans to eradicate brucellosis from the herd:
Plan 1 This plan is recommended for
commercial herds found infected. The following procedures should be carried
(a) Market the entire herd for slaughter
as soon as practicable.
and disinfect houses and equipment.
(c) Restock premises with animals (from
validated brucellosis-free herds), placing them on ground that has been free of
swine for at least 60 days.
After 2 consecutive negative tests, not less than 60 nor more than 90 days
apart, the herd is eligible for validated brucellosis-free herd status.
Plan 2 This plan is
recommended for use in infected pure-bred herds only where it is desired to
retain valuable blood lines. The following procedures should be carried out:
(a) Separate pigs from sows at 42 days of age
or younger and isolate.
infected herd for slaughter as soon as practicable. Infected sows should not be
rebred and should be slaughtered as soon as possible. Complete isolation of
infected animals is essential. The separated weanling pigs form the nucleus for
establishment of the infection-free herd.
(c) Test the gilts to be used for the
following breeding season about 30 days before breeding. Save only the gilts
that are negative. Breed only to negative boars.
(d) Retest the gilts after farrowing and
before removing them from individual farrowing pens. Should reactors be found,
they should be segregated from the remainder of the herd and slaughtered as
soon as possible. Select only pigs from negative sows for breeding gilts.
(e) If reactors are found in step
(d), the process is repeated.
Following 2 consecutive negative tests, not less than 90 days apart, the herd
is eligible for validated brucellosis-free herd status.
Plan 3 This plan is not recommended in
general, but it has been found useful in herds where only a few reactors are
found and where no clinical symptoms of brucellosis have been noted. Carry out
the following procedures:
(a) Market reactors
(b) Retest herd at
30-day intervals, removing reactors for slaughter until the entire herd is
(c) If the herd is not
readily freed of infection, abandon this plan in favor of plan 1 or plan 2.
(d) Following 2 consecutive
negative tests, not less than 90 days apart, the herd is eligible for validated
brucellosis-free herd status.