Lancaster Holstein Field Day
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A judging contest highlighted events at the Lancaster County Holstein Field Day, held
Thursday at the farm of Nelson Wenger, Manheim.
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Contestants judged heifers, three-year-olds, and aged cows, while Atlantic's Dale
Olver served as official judge. First-place winners were (from left): Dorothy Ranck,
women; Tom Wiker, youth; and Clifford Gibble, men.
Other activities at the field day included a buffet lunch and brief reports from Lan
caster county agent Glenn Shirk, dairy princess Janae Martin, and state director
Mowery Frey.
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DEKALB 12
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• Verticillium wilt resistance
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• Good anthracnose and
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WASHINGTON - US
Department of Agriculture
researchers have had 100 percent
success in tests of two ex
perimental vaccines to protect
sheep against costly bluetongue
" disease, a USDA scientist said.
Charles H. Campbell of USDA’s
Agricultural Research Service
said the vaccines immunized 12
sheep against two of the five
bluetongue viruses that are in this
country and cost farmers millions
of dollars a year. Worldwide, there
are 24 types of the virus that strike
cattle as well as sheep.
Campbell, a microbiologist, did
the vaccine research at the Plum
Island Animal Disease Center off
Long Island, N.Y., and
veterinarian T Lynwood Barber
undertook the testing at the
agency’s Arthropod-borne Animal
Diseases Laboratory, Denver,
Colo.
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Bl
Advantage
• One of our newest high
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• Outstanding performance
data in state trials
• Recovers quickly alter cutting
• Excellent phv tophthora root
rot resistance
• Good anthracnose tolerance
• Excellent winter hardiness
DEKALB-PPIZER
GENETICS
Lancaster Farming, Saturday, August 10,1985-A29
USDA perfecting vaccine
for bluetongue in sheep
Their research could fill the void
for safe vaccines against
bluetongue in sheep, according to
Dyarl D. King, the research
agency’s national program
director for animal health. A live
virus vaccine for one of the
in
viruses, type 10, is approved for
sheep, King said, but "live vaccine
viruses may revert to a virulent
form or cause birth defects if given
to pregnant animals. ’ ’
The new vaccines are safe
because they rely on killed viruses,
Campbell said. Gamma radiation
was used for the first time, he said,
to kill bluetongue viruses needed to
produce the vaccines
Gamma radiation destroys the
interior genes of the virus without
harming its protein coat that, in
effect, alerts an animal to the
bluetongue invading its body. An
animal recognizes the coat as a
foreign agent and forms antibodies
to fight the virus.
Campbell said further tests will
be made to confirm the initial
success in sheep. Vaccines could
be available in five or six years, he
said, pending the outcome of the
testing and federal approval.
Bluetongue is spread by flying
gnats that bite cattle, the mam
carriers of the virus, and then
attack sheep. Infected sheep can
die or suffer mouth sores,
lameness, abortions and birth
defects, while cattle can recover
but still carry the virus without
showing any signs of the disease.
No vaccine is available, Camp
bell said, to protect cattle against
the disease, which is found in most
parts of the country. It occurs
primarily in southern and western
states.
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