Animal Reproductive
Technologies
VACCINATIONS, TREATMENTS
& MANAGEMENT PROGRAMS September,
2005
Calving
difficulty (Dystocia)
The
symptoms of dystocia are obvious in most cases. The fetal membranes or the calf is seen in vulva or the cow is
laying on her side and straining.
Sometimes though, the signs of dystocia are not as obvious. For instance, a breech (pelvic or tail)
presentation, a twisted uterus, or a lateral (calf turned sideways)
presentation may cause the heifer or cow to show very few signs of
calving. In these cases you must
observe and act when subtle signs are seen.
These subtle signs may include nervousness, walking, lying down and
rising again quickly, mild straining, a persistently elevated tail, isolation
from the herd, a discharge from the vulva that is bloody or even clear with a
low viscosity.
How
long should I wait?
Generally
2 hours from the time that the cow’s water bag is showing or breaks is long
enough to wait and she should have assistance at that time. Sometimes a cow will only show subtle sign
of trying to calf (Breech presentations for instance). These signs include and tail elevation.
Heifers
should be allowed a maximum of 2 hours from the time that the "water
bag" is exposed to have her calf.
After that she should be assisted.
During the waiting period though, leave her alone and stay out of her
sight, as disturbances may delay calving.
Plan to have her at the calving barn within 2 hours if she makes no
progress. If in doubt about when she
started to calve (i.e. water already broken and a foot exposed) when you first
find her, check for progress in 30 to 40 minutes. If no progress has been made, take her to the calving barn and
give her assistance. If only subtle
signs of impending parturition are seen it is sometimes difficult to decide
whether to wait or help. If these
signs persist for 2 hours and no progress is made, the cow should probably be
examined. You may just be too early,
but it is better to be safe than sorry.
When
giving assistance there are several procedures that should be followed in all
cases. These include:
1. Wash
vulva and your hands and arms with a disinfectant soap prior to exam
2. Use
a sleeve to examine the heifer
3. Use
lots of water-soluble, clean lubricant in examination and delivery, especially
if the birth canal is dry when examined.
4. Double
loop the chains on the calf’s pastern and above the fetlock before applying
traction. A single loop may cause a
broken leg.
5. If
it is necessary to repel the calf back into the uterus in order to straighten a
leg or the head, take your time. Rapid
forceful repulsion will damage or rupture the uterus. Use lots of lube. If it
requires a lot of force to repel the calf an epidural may be required.
Calving
supplies:
1. Disinfectant solution (Nolvasan or
Betadine) for washing the vulva; one ounce per gallon of clean water is an
effective wash solution.
2. Soap,
Ivory soap or other detergent
3. Obstetrical lubricant; always use a lot of lubricant in delivering
a calf especially if the cow has been trying to calf for a while and the tract
is dry.
4. Obstetrical chains, 2 - 30” chains
and 2 - 60” chains
5. 3- handles for chains
6. Calf puller or a come-along
7. Calf supplies: iodine, C&D
antitoxin, C&D toxoid, Calfgaurd, BoSe, B-vitamins, iron tattoo pliers,
tattoo letters and numbers, tattoo ink, ear tagger, ear tags, tag marking pen,
8. Dopram injectable
9. Oxygen
10. Endotracheal tube
TYPICAL
CALVING PROBLEMS
The
calf is too big:
The
best indicator of whether a large calf is pullable or not, is whether the
calf’s head and legs are through the cows pelvis and presented at the
vulva. If the feet and nose are visible
in the vulva, palpate the birth canal to check for additional room and if the pelvis
seems as if it will accommodate the calf go ahead and pull it. If the calf’s head has not entering the
cow’s pelvis in spite of adequate dilation of the cow’s birth canal, an attempt
can be made to straighten the head. You
can use a loop of chain around the poll and into the mouth to attempt to
straighten the head. Once the chain is
on the head, moderate traction on the head can be applied to pull it into the
birth canal. Use lots of lube. Do not
apply heavy traction to the head during a difficult pull, use the loop of chain
around its head only to straighten the head.
Once the head is in the birth canal traction should only be placed on
the feet. If the head will not enter
the birth canal in spite of direct traction, it is likely that the heifer
requires a C-section.
The
calf is backwards,
If
no legs are present but the tail and pelvis are found, it is a breech
presentation. It is easiest to work
with a cow that has a breech presentation by first giving her an epidural
anesthetic with 5 to 12 cc of 2% Lidocaine.
After the epidural takes effect you can gently push the calf’s rump back
into the womb and reach for the hock of the first rear leg. Once the hock is found place one end of a
60” chain in front of and around the calf’s hock and pull it back out of the
vulva so that both ends of the chain are outside the vulva. Place one end of the chain through the loop
on the other end and tighten the chain around the area of the leg below the
hock (cannon). Then push the loop in
the chain down the leg until it is around the calf’s pastern (between the dew
claws and the foot). Next you need to
push the hock up and forward while gently applying traction to the calf’s
pastern (foot), in order to deliver the foot into the birth canal. If the foot is hard to pull it is necessary
to protect the uterus and vagina from bruising or laceration caused by the
calves hoof. Use your hand around the
calf’s hoof to protect the cow’s uterus as you apply traction on the
chain. It will sometimes take several
attempts at first pushing the hock forward and alternately applying traction on
the foot to succeed and not damage to the uterus or vagina. Once you get the first foot delivered;
repeat the process on the second leg. A
similar procedure will work for the front legs that are back. After both legs are delivered proceed as
outlined below under “backward with the feet presented”.
The
calf’s feet are upside down:
There
are two common situations where you may find feet upside down in the vulva
(sole facing upward toward the cow’s tail)
1. Backwards with the feet
presented. Usually it is OK to pull
these calves if the rump and tail will enter the cows pelvis easily. If it is difficult to get the calf’s hips
into the cow’s pelvic canal due to large calf size, the calf may also hang up
when it’s ribs are pulled through the cow’s pelvis. It takes good judgment and experience to decide when to pull
these calves and when to call the veterinarian for a cesarean section
operation. It is frequently better to
do a cesarean section if the calf is large.
2. Forwards but upside down: Usually the head is back also. As you straighten the head and bring it into
the birth canal, the calf will begin to twist into an upright position with
assistance. Be aware that the uterus
may also be twisted.
Twisted
uterus:
As
you enter the birth canal, if the vagina narrows down drastically before you
can reach the calf or cervical area consider the possibility that the cow has a
twisted uterus. If this has occurred
you may be able to identify longitudinal spiral folding in the wall of the
vagina. It may be difficult to reach
the calf, but if the cervix is dilated this is usually possible. This condition needs to be differentiated
from a simple non-dilated cervix preventing access to the calf, but the
characteristic feel of the twist in the vagina is diagnostic. The calf is probably lying upside down or
sideways unless the twist is almost 360 degrees. Swinging the calf in the opposite direction of the torsion or
rolling the cow in the same direction as the torsion while stabilizing the calf
can sometimes correct a twisted uterus.
It is always necessary to un-twist the uterus before you can deliver the
calf through the vagina. If attempts at
un-twisting the uterus fail a C-Section is required.
A
leg is back:
After
delivering both legs into the birth canal make sure that you have a matching
pair of front feet or back feet.
Occasionally there will only be one leg showing and the nearest foot
inside the uterus is not the mate to the one showing. Also verify the two legs you are pulling on belong to the same
calf. When twins are present they will
sometimes each have a leg in the birth canal.
The
head is back:
Unless
the head can be easily straightened and brought into the cow’s pelvis; you must
consider this to be a sign that the calf is too big for vaginal delivery. If you attempt to straighten the head use a
60” chain and place a large loop around the calf’s poll (behind the ears) and
through the mouth. gentle traction can
thus be applied to the head. Be
careful! Any manipulation of the calf’s
head is dangerous.
Sideways
calf:
This
is a rare condition and may be seen when the calf is a mal-formed “fetal
monster”, dead, or paralyzed (arthrogryposis).
Use an epidural of 5 to 10 ml of Lidocaine before manipulating the
calf. It manipulations are difficult or
impossible a cesarean section is required.
The
heifer isn’t dilated yet
You
can bring the calf’s feet and head into the birth canal, but you should proceed
slowly, allowing time for the birth canal to dilate further. You can also wait for 30 minutes to see if
she dilates better. Occasionally the
cervix will not adequately dilate. This
condition is referred to as “ring womb”.
If not severely restricted, gentle but persistent traction applied to
the calf will allow delivery with minimal trauma to the cervix or vagina. If severe a C-Section is required. Sometimes a heifer will require an
episiotomy in order to deliver a calf vaginally.
Some
other common procedures
Episiotomy:
An
episiotomy is an incision in the dorsal lateral wall of the exterior
vulva. An episiotomy can be used to
increase the vulvar area when a calf is progressing through the pelvis, but
birth is impeded by small vulvar area.
The episiotomy should begin at 10:00 o’clock or 2:00 o’clock positions
on the outside of the vulva and extend into the vulva only as far as is
necessary to allow exteriorization of the crown of the head. Usually birth will proceed easily
thereafter. The incision should be
sutured immediately after delivery. Usually
the area is numb and little if any local anesthetic is required for suturing.
Fetotomy
This
procedure involves cutting a calf into multiple sections for easy
delivery. Fetotomy procedures are
usually only done on a dead and decomposing calf (puke!), that are too large to
deliver. Since C-section is not a good
option when the calf is decomposing, it is better to dissect the calf
in-utero. Do yourself a favor and call
the veterinarian.
Post
delivery care:
1. Administer
2 or 3 ml. of oxytocin to the cow after a difficult delivery. You can use this opportunity to easily
obtain some colostrum from the cow, as oxytocin will do two things: cause
involution of the uterus and cause let down of her milk.
2. If
the calf is weak or stressed; milk the heifer for colostrum before releasing
her. Wait a few minutes after
administering the oxytocin, as this will cause her to "let down" her
milk.
3. If
a heifer's vulva is torn; take the time to clean the area, dry the vulva and
suture the laceration or use Super-Glue to glue only the skin of the laceration
so that the vulva looks as normal as possibly (don’t glue the placenta to the
vulva). If the heifer is excessively
"stretched out" place a purse string suture around the entire
circumference of the vulva using a Buhner needle and umbilical tape. Don't forget to untie and remove the purse
string in 2 to 4 days.
This outline is presented only as a
basis for discussion. A final plan can
be developed based on herd requirements and new products that become available.
Patrick J. Hemming DVM
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