Test ultrasonic pest repeller
This is an abbreviated report on the repelling effect of pulsed ultrasound on
laboratory mice using a sound attenuating baffle chamber performed at Bio-Acoustical
Laboratories Inc., Dallas, Texas, U.S.A. July 1983.
Ten mice were placed in the experiment, with half the population on either
end, i.e., in each choice box. Observations were taken every six (6) hours for
seven (7) days without any ultrasound stimulus.
This provided for an adequate control group study in order for a proper analysis
of variance and multiple t-test for statistical analysis. This also allowed
the subjects to adequately accommodate to the environment.
Observations were made in numbers
of subjects in each of the data sections A, B, C, D, E and E. Proper attention
was placed on humidity, temperature food and water sources. These environmental
factors were maintained as steadily as possible to allow for proper experimentation,
testing only the one variance in environment, that being the presence or absence
of an ultrasound stimulus.
At the end of the control group data collection, the ultrasound stimulus was
begun and half the population again placed in each choice box. Again observations
were made every six hours for a full week.
In every section (A-E) there are identical food and water stations. The ultrasonic
energy attenuating baffles were placed in sections B, C & D at even distances
according to sketch above. An ultrasonic pest device branded El Mar 300D was
installed in section A.
As can be seen from the first table from the first week (Dag 1-7) without
ultrasound the mice move completely randomly between the different sections.
Evaluating the second table containing data from the second week (Dag 8-14)
with ultrasonic sound one can see that all subjects within a few days tend to
have moved to the sections D and E, with the centre of gravity in section D.
It is with this experiment difficult to make any firm conclusion as to the fact
that the mice prefer section D in favour of E. One feasible theory though could
be that mice under stress tends to seek protection in narrow spaces, the more
narrow the better.
This type of ultrasonic pest repeller did show statistically significant repelling
effect. Mice show avoidance behaviour rapidly. This avoidance was seen both in
terms of where the population was during the observation periods and via activity
monitors such as water consumption.
James P. Humphries, B.S., D.V.M.
Bio-Acoustical Laboratories Inc., 9550 Forest Lane Suite 330,
Dallas, Texas 75243, tel. 214 343-4420
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