Report on the Agricultural Experiment Stations, 1953 Page: 26
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26 REPORT ON EXPERIMENT STATIONS, 1953
Hornfly control at lower cost
The Oklahoma station (coop. USDA) last year reported a 7-year
experiment that showed that there was an increase of about 18 pounds
in weight per beef animal in herds sprayed monthly during hornfly
season with a 0.5-percent DDT. Since then the Oklahoma station has
demonstrated that "rubbing posts" treated with insecticide solutions
were as effective as monthly sprayings with 0.5-percent DDT at half
the insecticide costs. There was practically no labor charge. The
type of post made little difference, but location was all important.
Best results were obtained when the posts were located where the cattle
spent most of their time. A comparison of hornfly control in
open and wooded pastures revealed that half the concentration of
insecticide used in wooded pastures was effective in open pastures.
Clipping cows controls lice
That lice on milk cows can be controlled by clipping is indicated in
Wisconsin station experiments. One group of cows was clipped, the
other remained unclipped. The following winter, the groups were
reversed. Each year, milk production was slightly higher in the
clipped group. These tests are being continued to verify the findings.
The station also ran clipping trials on heifers. Unclipped heifers
were badly infested with lice by early February, whereas heifers
clipped in the fall did not become badly infested until late March.
The heifers that were clipped or reclipped in February remained lousefree
for the rest of the season. One clipping in late fall and the other
in late winter apparently controlled chewing lice. A single clipping
was not sufficient since some lice lived through the clipping in protected
areas, and their offspring reinfested the animal when the hair got
long enough. No insecticides were used in these tests and the clipping
appeared to cause no discomfort, even in very cold weather.
Insecticide dusts control sheep keds
In 3 years of research the Wyoming station found that dusting
feeder lambs with insecticides controlled sheep keds but did not increase
the gains of the ked-controlled over the non-ked-controlled
lots. Although infestation of keds was moderate to heavy on the
lambs at the start of the trials, ked numbers on the untreated lots
soon declined after the lambs had been on feed for several weeks.
This was in contrast to increasing numbers of keds on range flocks at
the same time of the year.
The fact that the sheep ked feeds on its host by withdrawing blood
is sufficient evidence that the keds uses energy of the host and causes
some changes in the energy relations. Apparently, however, these
changes are not great enough to be reflected in the growth of feeder
lambs when the infestation of sheep keds on untreated sheep declines
after 4 weeks, as was the case with the feeder lambs. From a practical
standpoint the study presented no evidence that a saving could
be made by controlling keds on feeder lambs.
Cattle grub control
The cattle grub causes an annual estimated loss of millions of
dollars to the beef and dairy industries of the nation. The pest is
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United States. Office of Experiment Stations. Report on the Agricultural Experiment Stations, 1953, book, 1953; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5989/m1/28/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.