Al6—Lancaster Farming, Saturday, June 13,1981
Humans and livestock benefit
- DENVER, Colo. Livestock are Laboratories,
the new guinea pigs for medical Genetic engineering research
research using recombinant DNA centered on livestock for
and other genetic engineering several reasons, primarily
techniques; but the animals stand because livestock today are nor
to benefit as much as humans from mally crowded into close quarters,
recent breakthroughs. " making them more susceptible to
“I think it is going to disease,
revolutionize the (livestock According to Dr. Robert Ellis,
pharmaceutical) industry with microbiologist at Colorado State
new methods of immunizing University, “If cattle were still on
animals against disease,” said Dr. the open range, they wouldn’t have
Dick Searl of the Ford Dodge as many problems with anything.
UNIVERSITY PARK - Do yon
have some hogs that are scrat
ching and rubbing: have skin that
is cracked, sore, and tender? If
even a few pigs in an otherwise
healthy-looking pen show these
signs, there'is a good chance your
pigs have mange, according to
Lawrence Hutchinson, Extension
PENNSVIMUIIA
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tolerance to other tested races. Plus good emergence, too. Look
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AP-250 is ideal for the Arnsoy 71-Beeson-Woodworth maturity
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But in addition to big yields, AP-250 gives you good emergence,
tolerance to tested races of Phytophthora root rot and good
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THINK A pi
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Hutchinson talks mange control
Veterinarian.
Hog mange is caused by white
mites about l/60th of an inch long.
They burrow in the skin and suck
body fluids. These mites also cause
a skin irrigation which is the cause
of the itching and scratching.
Mange mites lay small eggs which
from genetic breakthroughs
especially not serious diarrhea.
Confinement of any species does
amplify problems that already
exist.”
Dr. Ellis, who is developing a
vaccine against diarrhea caused
by E. coli bacteria in livestock,
believes that a vaccine against
travellers’ diarrhea in humans is
now possible. “The research is a
lot of work with a lot of problems,
but it can be done with imagination
and money,” he said.
hatch in 7 to 10 days into adult
mites.
Although you may be able to
diagnose mange just by looking at
your pigs as sure way to confirm
the diagnosis is to have your
veterinarian examine a skin
scraping under a microscope. A
scraping from inside the ear is the
best, says Dr. Hutchinson.
'Control of hog mange requires
regular dipping or spraying. Three
effective products are malathion
(Cythion) 57% EC or 25% WP,
toxaphene 61% EC, and Co-Ral
(coumpahos) 25% WP. Follow the
label directions for mixing and
use. These insecticides are ef
fective against the adult mite, but
not against the eggs so repeated
treatments at one week intervals
Bit) Dutchman.- the Original
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So why not start your cage shopping with the No. 1 company in the field.
We can provide “all" the components that make up a complete cage system and
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Designers of Qualify Sysft
The recombinant DNA vaccine
research focuses oh individual
proteins, called antigens, which
are indirect culprits of viral and
bacterial disease. In the case of E.
coli, a few types of protein antigens
must be present for the E. coli to
attach itself to the intestinal' wall
and begin to multiply in the in
testine.
Once the scientist has identified
the antigens, he can duplicate
them by cloning, or by isolating
will be necessary to completely rid
your hogs of mange.
Remember that even one in
fected pig on the farm can be a
source of spread to others. That
means you should treat your boars
when the sows are trCated. You
should also treat purchased
animals before they are added to
your own stock.
One good time to treat mange
suggests Dr. Hutchinson is befdre
the sows enter the farrowing
house. Even mild mange in
festation in sows can be disastrous
to baby pigs.
Hog mange is a profit-robber and
is present on many Pennsylvania
farms. All it takes is a little time to
remove those mange mites from
your operation.
STILL # 1
EQUIPMENT
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Route 30 West at the Centerville Exit
ms for Poulfiy, Swine W Grain Handing.
and purifying them, for the vital
ingredient in the vaccine. The
vaccine stimulates the production
of antibodies, which destroy the
antigens and thereby prevent the
multiplication of the bacteria.
Before genetic engineering,
vaccines were made from a smai|
amount of the attacking virus,
which caused antibodies to form
agains that strain of virus. They
ahve been very effective in
preventing some viral diseases,
such as measles, mumps and
polio; but they are not specific
enough for some viral strains and
they are not effective agains
bacteria. ,
In addition to E. coli reserach,
efforts to clone the important
proteins in rabies virus are now
underway. None of the genetically
engineered vaccines now being
developed are yet on the market.
Scientists at the US Dept, of
Agriculture’s Plant and Animal
Protection Quarantine Center at
Plum Island, N.Y., working with
the private firm, Genentech, are
reportedly very close to developing
a vaccine for foot-and-mouth
disease. Because the disease is one
of the most vicious killers of many
types of livestock, the virus strains
are not allowed in the continental
US, and,research can only by
conducted- at the island
laboratiries.