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Sunday 11 December 2016

The challenges of a difficult calving

Peadar O Scanaill

Published 01/02/2012 | 06:00

The spring calving is well upon us here in the north east and with it comes the usual difficult cases. We had a cow with twins presented last week with four legs and no head in the birth canal. These can be quite difficult to rectify, especially in small heifers with a very narrow opening.

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It's the study of anatomy that comes into major play with these cases as we try to follow each limb back to each calf. At first, it's a case of determining if the foot is a front or back leg, and then which pair of feet belong to one calf and which pair to the other.

A very long arm is a huge help in these cases, and at all times the vet must be absolutely certain the correct feet are attached before beginning to pull the calf. Often with twins one calf is coming backwards, and every care must be taken not to catch the umbilical cord as the calf is being pulled out.

With a different case in early December, we had a fine Limousin cow presented with the calf coming backwards. It was a single calf and the mother was reasonably wide behind. She had been calving several hours with feet protruding for more than two hours, but with no further progress. On handling this case everything was as it should be, and initially we wondered why the cow was not getting on with her business. But very quickly it became apparent that the umbilical cord was caught around one of the hind legs.

The umbilical cord usually becomes entrapped in the last few days and hours of pregnancy when the calf is repositioning itself to enter the pelvic canal. Quite a deal of movement goes on just before the onset of labour. If the calf is presented backwards and is lying on its side or back in late pregnancy, it has to roll over to present correctly as the calving process starts.

Hind

As he rolls over, the umbilical cord, which is very close to the hind legs, can end up between the two back legs just as the calf is ready to move out into the birth canal. Now if the cow pushes or we pull, the cord will come under immediate pressure and break well before the calf is even a quarter way out.

That's his oxygen source cut off and now he takes his first breath. There is no air in the womb so out comes a dead calf after all the huffing and puffing. To avoid this, the vet must try to get the offending leg back around the cord to free it before pulling the calf out backwards.

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Another tricky calving that presents to vets is the cow with the twisted womb. Often the cow shows no outward sign of difficulty. She appears to begin calving and then just stops.

What has happened here is that in preparing to position itself for the birth process, the calf is doing its final roll or twist up into the correct position. Unfortunately, the entire womb rolls 90° in one direction or the other. The mouth of the womb is twisted into a narrow shape like twisting a plastic bag by the neck. The cow cannot push against this narrow passage and even the bust water bag won't peep out like a tell-tale sign for the farmer to know that she is calving. The call is often presented to the vet as a cow that should be calving, but seems not to be herself for the last while.

In the fresher cases, it's quite possible to get a live calf either out through the pelvis or by caesarean section. With the cases of uterine torsion of several days and a dead calf inside, the outcome can be quite grim.

I well remember one particular case of a twisted womb in a Charolais cow. It was years ago when I was only a few years on the go as a vet, and full of confidence to tackle any case. I had plenty of cases of twisted wombs under my belt and had managed to untwist every one of them, and pulled them all out through the birth canal.

This particular Charolais cow was enormous and so was the calf inside her. The womb was twisted one full turn to the right, and I was fully determined to undo the twist and pull the calf out. Almost exhausted I eventually righted the calf only to find he was way too big to exit in the usual fashion. So back to the drawing board, and take the calf out by caesarean section. Nowadays, when a uterine torsion or twisted womb presents, I'll quickly decide if we're going to untwist and calve conventionally or simply clip, prepare and take the calf by caesarean.

One way or the other, the next time you call the vet to a calving, you can now see what's going on in our minds as we size up some difficult cases. My mentor when I was a student told me that if the end result is a live calf and a standing cow, then you've done the right thing. That's our aim at the start of every case.

Peadar Ó Scanaill is a vet in Ashbourne, Co Meath, and a member of Veterinary Ireland. Email: HQ@vetireland.ie

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