Di6—Lancaster Farming, Saturday, June 7,1980
Heat detection in cows uses hormones for bullish results
COLLEGE PARK - With
herd sizes increasing, it
becomes more difficult to
establish and maintain a
good program for successful
detection of heat, says Roy
L. Ax, Extension Dairyman,
University of Wisconsin.
Every dairyman must
have some method for
identification of each
animal. Also, accurate
records must be kept of
animals that were observed
mheat
Heat occurs ap
proximately every 21 days
until an animal becomes
pregnant. The hormone
estrogen is produced by the
ovary to cause the behavior
known as standing heat.
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Route 2 Watsontown. PA 17777
717-649-5321
Standing heat lasts 10-18
hours, and the egg is
released 10-12 hours after the
end of standing heat
Behavioral changes
commonly occurring during
heat are restlessness,
bawling, walking, nudging,
sniffing, standing up whan
others are lying down,
mounting other cows, and
standing for other cows that
may be in heat. If animals
are allowed to interact in a
group (preferably away
from feed) as a daily
routine, it becomes easier to
see some of these behavioral
changes.
Unfortunately, 68% of
activity associated with heat
occurs between 6 p.m. and 6
"■*v
a.m. Two or more animals in
heat at the same time tend to
find each other. Two animals
in heat attempt four times as
many mounts as only one
animal mheat.
One method to guarantee
that one animal is always
aggressive utilizes hormonal
injections of the male hor
mone testosterone. Dr. Jade
Britt from North Carolina
State University, pioneered
most of these studies.
A dry cow or heifer is
selected to receive the
treatment. After the in
jections, she behaves more
like a bull. She then is used m
a group situation where she
can interact with the rest of
the herd. The frequency of
mountings increases,
thereby increasing the
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Ph (215)683-7252
chances for someone to
determine which animal or
animals are in heat.
Masculinizes cows or
heifers are not dangerous
like a bull. More important is
the fact that when they
mount cows in heat, there is
no danger of spread of
disease that can occur with a
penis.
When fitted with a chin
ball marker and permitted
to remain with the rest of the
herd, these animals can be a
real asset to a heat detection
program, Ax said.
The current DHI position
on a cull cow is that these are
dry cows. If they unprove
heat detection and shorten
the calving interval, they
should pose no significant
threat to affecting rolling
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herd average.
The recommended ad
ministration of the hormone
as published by Dr. Britt’s
laboratory follows:
Inject animal in
tramuscularly with 200 mg
testosterone propionate in
com oil every other day for
20 days. This is the induction
treatment.
Two to three days after
termination of the induction
treatment, the maintenance
treatment begins. 500 mg of
testosterone propionate in
corn oil is injected sub
cutaneously every 2-3 weeks
for as long as the animal is
desired to detect heat. Some
persons prefer implants of
Synovex-H for the main
tenance treatment. These
work for 4-6 months.
West Grove, PA
Ph (215)869-9440
869-2214
ARNETTS GARAGE
Rt 9 Box 125
Hagerstown, MD
Ph-(301) 733-0515
ABRACZINSKA’S FARM EQUIP. INC.
Use a chin-ball marker for
best results. Use a docile
animal because it must be
handled frequently to fill the
marker and give injections.
Milking animals should
not be used. Dry off cull cows
before starting hormone
treatments. It is illegal to
ship milk from testosterone
treated cows. Consult with a
veterinarian.
MARLIN W. SGHREFFLER
Pitman, PA
Ph (717)648-1120
M.M. WEAVER & SON
N Groffdaießd
Leola, PA 17540
Ph (717)656-2321
RD 1, Catawissa, PA
717-356-2323
(South on Rt 42)