Objective—To evaluate progress made by cattle herds in the control of paratuberculosis (Johne's disease) through participation in the Minnesota Johne's Disease Control Program (MNJDCP).
Design—Retrospective records analysis.
Sample Population—Data for dairy and beef herds participating in the MNJDCP.
Procedures—Data for the MNJDCP were collected for analyses. Outcome measures included changes in numbers of participating cattle producers, risk assessment scores, and within-herd seroprevalence of Johne's disease by year of program participation.
Results—Results revealed steady increases in program participation by cattle producers in Minnesota over time, with > 30% of dairy producers and 2% of beef producers in the state participating by the end of 2006. Despite risk of introduction of Johne's disease to cattle herds through continued introduction of cattle from other herds, dairy and beef herds in the Management Program of the MNJDCP reduced their on-farm risk assessment scores during the program. Dairy herds in the Management Program reduced their mean within-herd seroprevalence 1.1% during the first year, 2.6% during the first 2 years, and 4.0% during the first 3 years of program participation. Significant within-herd seroprevalence reduction was also detected for beef herds that participated in the Management Program for at least 3 years.
Conclusions and Clinical Relevance—This study revealed a reduction in the risk of withinherd transmission of Johne's disease and seroprevalence over time in dairy and beef herds in the Management Program of the MNJDCP. This is consistent with a positive effect of the program for the control of Johne's disease in cattle.
Objective—To record respiratory sounds in exercising
horses and determine whether spectrum analysis
could be use to identify sounds specific for laryngeal
hemiplegia (LH) and dorsal displacement of the soft
Animals—5 Standardbred horses.
Procedure—Respiratory sounds were recorded and
pharyngeal pressure and stride frequency were measured
while horses exercised at speeds corresponding
to maximum heart rate, before and after induction
of LH and DDSP.
Results—When airway function was normal, expiratory
sounds predominated and lasted throughout
exhalation. After induction of LH, expiratory sounds
were unaffected; however, all horses produced inspiratory
sounds characterized by 3 frequency bands
centered at approximately 0.3, 1.6, and 3.8 kHz. After
induction of DDSP, inspiratory sounds were unaffected,
but a broad-frequency expiratory sound, characterized
by rapid periodicity (rattling) was heard
throughout expiration. This sound was not consistently
detected in all horses.
Conclusions and Clinical Relevance—The technique
used to record respiratory sounds was well tolerated
by the horses, easy, and inexpensive.
Spectrum analysis of respiratory sounds from exercising
horses after experimental induction of LH or
DDSP revealed unique sound patterns. If other conditions
causing airway obstruction are also associated
with unique sound patterns, spectrum analysis of respiratory
sounds may prove to be useful in the diagnosis
of airway abnormalities in horses. (Am J Vet Res