The lambing process
The lambing process has evolved over thousands of years and
most ewes will lamb normally without any trouble or need for assistance.
However, understanding the lambing process can help you understand
when a ewe is ready to give birth and when it may be necessary
to lend a helping hand.
The whole lambing process is controlled by a complex series
of hormonal changes. It is the lamb who decides when it is time
to be born. When a ewe is getting ready to deliever her lambs,
she may not eat. Her udder and teats will be distended. Her
vulva will be very dilated. She will appear a bit hollow just
in front of her hips, and she'll be not as wide nd full over
the rump, because the musculature there will have relaxed. The
process sometimes appears "confusing" to first-time
mothers, especially yearlings.
Lambing is divided into several phases. In the first phase,
the cervix dilates and the birth canal is prepared for delivery.
This phase lasts for approximately 12 to 24 hours. At the end
of this phase, a clear-whitish discharge will appear. The presense
of the mucous discharge means that lambing has begun. In the
next phase, uterine contractions will increase.
As labor progresses, the ewe will spend more time lying down
on her side with her head turned in the air. Eventually, a large
"bubble" or water bag will appear, break, and expel
the water. At this time, the tip of the nose and front feet
of the lamb can be felt. The lamb is expeled. As ewes often
have multiple births, the same sequence of the rupture of the
waterbag and expulsion of the lamb will be repeated for the
delivery of each lamb. Ewes will vary in the time taken to complete
The last stage of lambing includes the expulsion of the afterbirth
or placenta. The placenta is usually expelled 30 to 60 mintues
after the delivery of the last lamb. If the placenta is not
expelled after 24 hours, there may be a problem. The ewe will
eat the placenta because her instincts tell her to hide evidence
of lambing to protect her offspring from predators. The placenta
should be discarded to prevent the spread of disease and scavenging
© Queen's Printer for Ontario, 1999.
Dystocia: assisting with difficult births
Dystocia (or difficult births) is one of the leading causes of
newborn lamb death. A New Zealand study showed that dystocia accounted
for about 50 percent of deaths among newborn lambs. There can
be many causes of dystocia in a flock:
2) Disproportionate size of the ewe and lamb
3) Malpresentation of the fetus
4) Failure of the cervix to dilate
5) Vaginal prolapse
6) Deformed lamb
One of the most difficult aspects of shepherding is knowing
when and how to assist a ewe during lambing and when to call
for help. It is generally recommended that if a ewe has been
straining for over an hour and has nothing to show for it, it
is time to check things out. Before entering a ewe, be sure
to remove watches, rings, and other jewerly. Wash your hands
in warm, soapy water and clean backside of the ewe.
Gloves or sleeves should be worn during the examination. Coat
your hand up to your elbow with a non-irritating lubricant.
The liberal use of a lubricant cannot be overemphasized. Bunch
your fingers and thumb into a cone shape and insert them into
the ewe's vagina. If the cervix is open, you should feel the
lamb's nose. Next, you need to determine where the lamb's front
legs are. If the presentation is normal, the ewe should be able
to deliver the lamb on her own, unless it is too big for her
You should not keep pulling your hand in and out of the ewe
and should not change hands without washing again. Getting the
ewe to stand up or elevating her hindquarters will allow more
room for repositioning nd result in less vigorous straining.
If you have worked for a half hour with no progress, it is a
good idea to call a veterinarian or a more experienced shepherd.
Excessive stress in pulling and delayed delivery can result
in a dead lamb and serious injury to the ewe.
A live lamb will assist to some extent with its own birth. There
is never enough room in the birth canal to correctly position
a lamb. The lamb must be returned to the uterus before any corrections
can be made. You should not attempt to deliver a lamb when the
birth canal is only partially dilated. This can seriously damage
the ewe. After all deliveries, check to make sure that there
are no other lambs remaining in the uterus. After any assisted
delivery, you should give the ewe an injection of a long-acting
Normal delivery is when the two front feet appear with the head
resting between them. Rarely is any assistance needed. However,
a small ewe may have trouble delivery a very large lamb. In
this case, gentle assistance may be needed. You should pull
the lamb downward during her contractions.
A backwards (hind legs first) delivery is also a normal delivery.
It is common with twins and triplets. You should never attempt
to convert a backwards delivery to a "normal" frontwards
delivery. Turning a lamb around can result in death of the lamb
or damage to the uterus. Plus, it is not necessary.
An elbow lock is a "normal" position except the lamb's
elbows are locked in the birth canal. You will need to push
the lamb slightly back into the birth canal to extend the legs.
If one or both legs are back, you need to cup the lamb's hooves
in your palm and bring them forward. A small lamb may be pulled
with one leg back. If you are not able to bring the legs foward,
you should slip a lambing rope onto one or both limbs and push
the head back far enough to allow the legs to be drawn forward.
If the front legs are forward, but the head is back, you will
need to push the lamb back into the uterus, so you can turn
the head around. You should attach a lambing rope to each leg
so you don't lose them. The lamb should not be pulled out by
the jaw. A lamb with a broken jaw cannot suck and will likely
die. You can use the eye sockets to pull the lamb's head.
Disproportionate size (tight birth)
Many lambing difficulties are due to the disproportionate size
of the lamb and ewe. This can be the result of a large lamb,
a small pelvic opening, or both. It is most common with young
ewes and flocks that have a majority of single births. Lubrication
and gentle, but firm assistance will usually alleviate the problem.
You may have to pull the skin over the head. Extending one leg
at at time may also help.
A "true" breech birth is when the lamb is positioned
backwards, with the rear legs tucked under and only the tail
near the opening. A breech birth is common when the ewe has
been straining for a long time and there is very little discharge
and only a small water bag.
To deliver a breech lamb, the first
thing you have to do is bring the rear legs forward by cupping
the fetlocks in your palm. Once the rear legs are forward, you
need to quickly deliver the lamb because once the umbilical
cord breaks, the lamb will begin breathing and could risk drowning
in its own fluidS.
If the head has been outside the vulva for a long time, it may
have become very swollen. The tongue may be sticking out. While
it may appear cold and dead, a lamb can survive for long periods
of time in this position. If the head is covered with straw
and feces, it will need to be washed beofre being returned to
the uterus. Plenty of lubricant should be used. Margarine is
an excellent lubricant for this purpose. If the lamb is dead,
it is often easier to remove the head.
Sometimes, lambs are presented with their legs intertwined.
Before attempting to deliver these lambs, you need to determine
which legs belong to which head. It may be necessary to repel
one lamb to allow easy delivery of the other. Ewes carrying
triplets often have a higher percent of malpresented lambs,
so flocks with high lambing rates require closer supervision
Dead and deformed lambs
The removal of delivery dead and deformed lambs often requires
veterinary assistance. Deformed lambs often cannot pass through
the birth canal. If a lamb is freshly dead, it may be possible
to extract it, but lambs lambs that have been dead for some
time often must be removed in pieces.
If your flock experiences excessive lambing problems, you need
to consider your breeding and nutrition problems. For example,
a lot of oversized lambs could mean you are overfeeding you
ewes during late pregnancy or using too large of a sire breed
on your ewes. In addition, ewe lambs should not be bred until
they have developed sufficiently. The rule of thumb is not to
breed ewe lambs unless they have acheived approximately 70 percent
of the mature weight.
Failure of the cervix to dilate is called "ringwomb."
It is one of the most difficult lambing problems to deal with.
True ringwomb does not usually resond to any medical treatment
or to manipulation of the cervix. A caesarian section is usually
the only viable option.
Ewes experiencing ringwomb should probably
be removed from the flock. Ringwomb occurs most commonly in
ewe lambs. Selenium deficiency is considered to be a contributing
factor, but the condition is not fully understood. Its exact
cause is unknown, though it is believed to have a genetic component.
After a normal lambing, the ewe can usually take care of her
newborn lambs. It is best not to interfere. In unusual cases,
it may be necessary to wipe the mucous from the lamb's nostrils
to permit breathing. You'll want to make sure that the ewe claims
each of her lambs and allows them to nurse. A vigorous lamb
will get up and nurse within a half hour to an hour after birth.
Make sure each lamb gets colostrum, the first milk produced
The lambing process
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