Plo—Uncaster Farming, Saturday, March 29,1980
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Drs. Gregory Brooke, left, and John Hasler work with swift intensity to implant
an embryo into the womb of a young heifer. The embryo had been flushed earlier
in the day from the womb of an outstanding milker in upstate New York.
Embryo transplants
(Continued from Page D 8)
McCauley explained ET
practice m the farmhouse
office that serves as
headquarters for the firm.
McCauley, who got his
DVM from Cornell in 1969,
opened his first ET business
m early 1973 just outside
Mount Joy. In the years
between 1969 and 1978, he
completed an internship in
large animal obstetrics and
surgery, taught bovine and
equine reproduction at
Cornell for three-and-a-half
years and had a dairy
practice for three years.
In the last four months,
McCauley, Easier and their
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helpers have completed 700
embryo transfers, and
they’re aiming for an
eventual production of 300
ET’samonth.
At first, McCauley said,
they worked mostly with
problem cows, good animals
who couldn’t be bred. ET can
be a life-saver for problem
breeders, because some 40-
percent of them can produce
good embryos when they’re
super-ovulated
But properly managed, ET
is more than a tool for
dealing with fertility
problems. It can be used by
the dairyman who wants to
build a top herd in a hurry,
m
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and it can be used by the
dairyman who wants to sell
top breeding stock.
McCauley said they work
with their clients in choosing
animals and setting goals for
an ET program.
“We look at type, pedigree
and production, factors that
Galen Crouse mentioned,”
McCauley noted. “Those
numbers are pretty easy to
get One of the big question
marks in ET practice is
whether or not a cow can
transmit those superior
genes to her offspring.”
After an EmTrain client
selects a cow for ET
breeding, she receives a
senes of drugs which cause
her to super ovulate. After
her ovaries have been in-
dial Aim
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BARN
ducted into releasing dozens
of eggs at once, she is ar
tificially inseminated.
Seven or eight days after
she has been inseminated,
McCauley, Hasler or Dr.
Gregory Brooke, the other
EmTram veteranan, visits
the cow, flushes the embryos
from her and, usually, bring
them back to Elizabethtown.
The embryos are carried
simply in a small bottle
containing a nutrient
solution. At this stage, the
embryos are about six days
and still encased in a tough
membrane which withstands
a surprising amount of
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almost casual, even rough,
treatment. McCauley
carries the embryos in his
shirt pocket, to help them
stay warm.
At the E-town lab, the
embryos must be separated
from the bits and pieces that
follow them out of the cow’s
uterus. Demonstrating the
technique, Hasler dipped a
syringe into a small bottle
holding half-a-pmt or so of
fluid that has been added to
the flushings from a cow’s
uterus.
He squeezed the bulb of the
syringe a number of times,
rapidly drawing the fluid up,
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then ejecting it back into the
bottle. This helped to break
up the solids in the fluid,
it didn't affect the embryi
Hasler said.
Using a .microscope,
Hasler then looked for the
embryos, then determined
which were suitable can
didates for transplantation
and which weren’t.
Those that were, he placed
in a tiny dish on the
microscope stage. When he
finished, the dish held eight
pinpoints of life, any one of
which could now be on its
way to becoming a $200,000
(Turn to Page Dll)
THE
TOWN.
'i