>-Lanc«ster Farming, Saturday, March 8,1969
22
Most Dairy Cattle Have
Worms, Study Indicates
Parasitic roundworms have research effort to discover
infected some of the cows in an geographical patterns of round
estimated 08% of the nation's worm distribution in all U.S.
dairy herds, according to a study cattle beef, dairy and feeder,
by Merck & Co., Inc. Some animals in almost all of
The study covered 140 dairy the herds surveyed carried
herds in nine representative mundworm burdens. The actual
states. It was part of a larger number of individual animals
showing evidence of roundworm as Montana and Wisconaln—-once obtained even when animate
infection averaged 87% of those thought to be relatively free of with fecal counts of'less' than
tested in the study. Infection roundworm problems—the rate 100 epg were treated, indicating
was determined by fecal round- of infection among dairy herds that roundworm infection may
worm egg counts undertaken was 100%, while the infection be present even in some cases
by local agencies with the help rate for individual dairy animals where there is little evidence of
oi Merck veterinary technical was among the highest found in it Thus, they said, even though
specialists. the survey. 67% more than two:thirds of
States covered in the survey While evidence of widespread individual dairy animals
were Illinois, Indiana, lowa, parasite problems among beef, studied proved to be harbor-
Mississippi, Montana, Oklahoma, cattle has been accumulating for in £ parasites by the above
Tennessee, Texas and Wisconsin, some time, there has been, a lack- ac toaliy the .true figure
Little difference in the generally of similar basic information nusht be somewhat higher. ,
high rate of herd infection was about patterns of infection an •
found from state to state. dairy cattle. Turnpikes
Noting the almost universal In evaluating the figures for Control of early American
presence of roundworm evi- dairy herds, the researchers con- highways was given to the. in
dcnce, the researchers concluded sidered as “positive” only those dividual _states, which levied
that “roundworms appear to be samples which showed the tolls for their maintenance. Toll
the most serious overall internal presence of eggs through the houses, were equipped with long
parasite problem in ruminants in Stoll or flotation methods, or pikes to stop travelers for the
the U.S.“ No difference, they which had a McMasters epg collection of tolls and, after col
said, was observed in the rate of count of 100 or more. However, lecting the fees, the gatekeeper
herd infection between beef they pointed out that significant turned the pike. The roads
cattle and dairy cattle. improvements in rate of gain thus came to be called “turn-
Even in such northerly states and feed conversion have been pikes.”
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