D24—Lancaster Farming, Saturday, September 29,1984
Long calving
BY GEORGE F. W. HAENLEIN
Extension Dairy Specialist
University of Delaware
Are you milking more cows and
enjoying it less? If you’re typical of
the average dairyman, the answer
is probably YES. Some of this
dissatisfaction can be traced back
to the reproductive performance of
your herd.
To illustrate my point, let’s look
at two cows. Both produce 16,000
pounds of milk per completed
lactation. The only difference
betwen them is that one calves on a
12 month interval while the other
calves every 14 months.
Calculate their annual milk
production, and you’ll find that the
first cow produces 16,000 pounds of
milk in a yar, compared to only
13,741 pounds over the same period
for the second one. That’s a
whopping 2,259 pounds of milk
difference.
Assuming a gross value of $14.00
per hundred weight for the milk,
cow no. 1 earned you $2,240.00 in
that year. During this same time,
cow no. 2 earned only $1,923.74, or
$316.26 less. To determine the total
impact of this kind of performance
on a dairy farm, multiply $316.26
times 50 (half of the average herd
size in this region) and you come
up with a final dollar value in
excess of $15,813.00 per herd per
year-all because of the difference
in calving intervals. That’s a
pretty sizeable amount of money.
Another way of making the
comparison is to determine the
number of cows required to
produce milk with a given market
value. In this illustration let’s
assume that farm no. 1 has 100
cows producing 16,000 pounds of
milk per lactation with a 12 month
calving interval. The question then
becomes; “How many cows are
required in herd no. 2 to produce
the same amount of milk with the
same production per lactation but
a 14 month calving interval?” Or,
if you like, rephrase this question
in terms of dairy incqpie
representing the difference in total
milk output due to the differences
in calving intervals.
It’s easy to calculate the effects
Forestry seminar
slated
FREDERICK, Md. - The Mid-
Atlantic Forestry Seminar will be
held in Frederick, Md. on Oct. 27.
Sponsored by the University of
Maryland Cooperative Extension
Service (UMCES), the seminar
features general session speakers
from the Maryland Department of
Natural Resources.
It focuses on specific problems
facing today’s forest and woodland
owners in a series of workshops,
including;
—Computer software can help
owners evaluate management
orograms on their land.
—Forest landowners can
levelop an arsenal of corn
nonsense practices to maintain
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The seminar runs from 9 a.m. to
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he registration fee of $2O before
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orestry handbook.
For more information about the
seminar, or to register, call: Terry
Extension Agent, Frederick
bounty, at (301) 694-1594.
dairy profits
cut
of longer calving intervals on herd
size.
Herd no. 1 produces 1,600,000
pounds of milk in 12 months from
100 cows. Herd no. 2 produces only
1,374,100 pounds from their 100
cows over that same period. In
order to produce the same amount
of milk in a year (1,600,000
pounds), herd no. 2 needs 16.4 more
cows (2,259 divided by 13,741).
Similar consequences caw be
calculated for different herd sizes
and other calving intervals.
The point is, it requires more
cows, more milk per cow, more
work, more feed-and just plain
more of everything-to end up with
the same amount of milk and
money when calving intervals are
longer than they should be.
The economic effect of long
calving intervals is obvious. It
required almost 17 percent more
cows to produce that same gross
income in this example. Can you
afford to feed this many extra
cows? Especially with limited feed
supplies and today’s high costs?
What’s the solution? To reduce
the cost of long calving intervals,
intervals
you must develop an effective
reproduction management
program. This can include the
following: complete animal
identification, adequate and
complete records, and effective
estrus detection program, proper
breeding procedures, a sound
animal health program, an
adequately balanced ration and a
monthly veterinary check of all
cows that are not pregnant. If any
one of these factors is missing, the
result will be excessively long
calving intervals. Silent heat is one
of the biggest problems, but the
new “activity meters” (from
USDA research that’s at least 10
years old) promise to be a big new
help.
It is possible to make more
money with less cows. Reaching
that goal isn’t easy but by working
with good herd records, a
veterinarian, your local extension
service, the feed supplier and, in
particular, good DHI records, you
can achieve excellent reproductive
performance. And that’s one of the
keys to profit in today’s dairy
business.
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