<:
SYRACUSE, N.Y.
Scientists are taking
new approaches to
boosting the growth of
beef cattle and milk
yields in dairy animals.
A Cornell University
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scientist says that
natural bovine growth
hormone (bGH) speeds
up the growth rate of
dairy heifers, resulting
in more and leaner meat
with less fat.
* * t,' j•?i§ i f y ‘ Is<hl* - 0 ?
Isolated from
pituitary glands in
slaughtered cattle, the
growth hormone also
dramatically increases
milk-synthesizing cells
in mammary glands in
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6 t 4-- * t *■ f
the same
tested.
animals
Such an increase in
the milk-manufacturing
tissue in young animals
may lead to improved
milk production when
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99
Lancaster Farming, Saturday, November 3,1984—A19
3 ’w '
these animals become
full-fledged milking
cows, says Dale E.
Bauman, a professor of
nutritional biochemist
ry in the New York State
College of Life Sciences
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at Cornell.
Bauman presented his
research findings
Wednesday at the 1984
Cornell Nutrition
Conference for Feed
Manufacturers now in
BUTLER
AGRI-BUILDER
session in Syracuse.
The Cornell scientist
conducted the study
jointly with two Danish
scientists-Kris Sejrsen
and John Foldager-at
the Danish National
Institute of Animal
Science in Copenhagen
during 1983-84.
The study had two
objectives: to deter
mine effects of long
term administration of
natural bovine growth
hormone on growth
rates and mammary
development of young
growing dairy animals.
Nine pairs of identical
twins were tested in this
study. One of each pair
received daily in
jections of hormone for
more than 100 days, and
the other one of each
pair was used as con
trol.
The hormone treat
ment began shortly
before the test animals
reached puberty (about
£ months old); each
weighed about 400
pounds (180 kilograms).
Results show that the
hormone treatment
improved weight gain at
a rate of about 9 percent
a day during the study,
with more muscle and
significantly less fat.
Because fat
production in the
animals tested is
significantly lower than
normal, the finding may
have a major impact on
the beef industry in the
United States.
“The difference
between the value of fat,
a by-product, and feed
costs for the fat
represents an annual
cost of more than $1
billion dollars that is
absorbed by the
producer, processor,
and consumer,’’
Bauman pointed out.
“Thus, even small shifts
in diverting nutrients
for muscle rather than
body fat would have
tremendous com
mercial impact.”
In another phase of
the Cornell-Denmark
study, researchers
discovered that the
mammary tissue called
“parenchyma” that
manufactures milk in
cows’ mammary glands
was increased by 38
percent.
“This is a dramatic
boost,” Bauman
commented.
He said that it is
theoretically possible
for these animals with
greater milk-producing
tissue to produce more
milk than normal cows
when they go into milk
production.
“Results from this
initial experiment are
extremely encouraging,
but additional studies
are needed to determine
if this enhanced
mammary development
around puberty will lead
to increased milk
yields,” Bauman said.
As in other studies in
which hormone-treated
milking cows increased
their milk yields
dramatically (up to 41
percent), Bauman is
convinced that results of
the Cornell-Denmark
study strengthen
graving evidence that
(Turn to Page A 33)