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Dairy
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Heifer Heat Detection
A significant study on the effects
of feeding schedules on heat
detection was published several
years ago. The study was done at
the Agricultural Research In
stitute of Northern Ireland in 1983.
It is worthy of attention, not
because of the awakening we have
recently had by the Irish dairy in
Georgia, but because it points out a
very usable principle for us all.
When fed their grain in the
morning, as many of us just
naturally do, it was found that
most of the heat activity occurred
at night, between 8 p.m. and 6 a.m.
We seldom are inclined to observe
the heifers for heat at that time of
day. The secret seems to lie in
when the grain is fed.
HOURS:
Mon., Thurs., Fri,
BAM-BPM
Tues. Jt Wed.
BAM-S:3OPM
Sat. 8 AM-2 PM
Maybe one of the reasons we too
often rely on a young bull to breed
the heifers is because they are too
hard to observe in heat. Heifers
are somewhat quieter than older
cows and therefore harder to see in
heat. If it occurs at night, or when
we are not inclined to look closely
for it, heats are easily missed.
The study done by the Irish
researchers found that simply by
changing the time of day that grain
or concentrates are fed to heifers,
will affect the time of day that
most heats are observed. When
grain is fed in the evening, more
than twice as many heats were
easily detected. This increase in
detected heats is because the
heifers were more obviously active
during the daylight hours, when
someone was around to see it.
As reported in Hoards
Dairyman, July 25, 1983, there
were 106 heats observed when
grain was fed in the evening,
against only 32 heats observed
when the grain was fed in the
morning. These heats were ob
served between 6 a.m. and noon.
Between noon and 6 p.m. there
30 YEARS AGO
-Although some scattered parts of
Lancaster county are dry, hot
weather has brought corn and
tomatoes right along according to
associate county agent Harry S.
Sloat. Hay making is generally in
full swing. Cherry picking is un
derway. And combining of barley
started Tuesday.
-July 1 will be the official transfer
date of the new Pennsylvania State
University experimental farm
north of Landisville. On Tuesday
some 20 persons toured small grain
plots and heard reports from ex
ports in the field.
-Thirteen steers died early last
week on the farm of Lester High,
R 1 Denver, on a pasture that had
been sprayed earlier with a weed
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Lancaster Farming, Saturday, June 28,1986-A29
were 107 heats observed after
evening feeding, compared to only
56 observed after morning feeding.
The average is more than two-to
one in favor of evening feeding.
It doesn’t necessarily mean that
the heifers don’t come in heat when
fed in the morning. They are just
more active at an inconvenient
time of day for observation.
Who wants to spend the night in
the heifer barn, looking for heats?
Unless we install a TV monitor in
the heifer bam, and watch for
heats from the living room sofa
few people are willing to spend
their evenings in this practice.
It shouldn’t be too hard to change
the heifer feeding routine from
morning to evening. If we can
double the number of heats ob
served, and consequently get a few
more heifers bred on time, the
change will be worthwhile.
Since the study was done by un
biased research, using randomly
selected heifers of mixed breeds,
the effect of feeding time on estrus
observation does not seem to be
genetic or breed related. It might
be worth a change in feeding time,
if you are having trouble catching
heifers in heat, just because of off
time activity.
THIS WEEK
killer. Harry S. Sloat, Associate
Lancaster County Agricultural
Agent warns that sprays such as
this can be dangerous up to two
months and much care must be
used to prevent livestock from
coming in contact with the
vegetation where chemical residue
remains.
-An increase of 26 percent in the
number of chicks turned out by
commercial hatcheries in Penn
sylvania during May compared
with the same month last year was
announced today by the State
Department of Agriculture. About
half of the May hatch of 10,057,000
chicks went to the increasing
broiler-fryer trade according to
federal and state surveys.
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