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  There are several causes as to why a ewe may prolapse her vagina.
1. Poor quality feeds, have increased rumen fill to meet energy demands and the vagina is pushed out due to intraabdominal pressure.
2. Phytoestrogenic forages such as legumes may cause laxity of the vaginal supportive structures resulting in prolapse.
3. Body condition score less than 2 and above 3.5.
4.Overcrowding at the feed bunk which causes increased abdominal pressure.
6.Previous history of vaginal prolapse or previous trauma during parturition
7. A major factor is increased pressure in the abdomen, caused by a uterus full of lambs, a full rumen and sometimes a full bladder and a lot of abdominal fat.
8. Other factors include slackness of the ligaments around the birth canal, sometimes associated with poor nutrition.
9. There have been suggestions that low magnesium status and possibly low calcium status may be involved.
10. Another possibility is that selection for ease of lambing has resulted in ewes with a generous birth canal which is more likely to prolapse. 
Information above from: MAF and from College of Veterinary Medicine, Virginia Tech

This page was last updated on: October 26, 2008
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Prolapse Harness
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A  harness for secure retention of prolapses without the need for stitching. Simple, secure, hygienic, can be used in conjunction with the ewespoon
Ewe Spoon
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For vaginal prolapses before lambing - with 3 tying holes
1. Replace the vagina after cleaning with a mild soap.
2. Antibiotics may be indicated depending on the integrity of the cervix and vaginal wall.
3.After replacing the vagina one can place a purse string suture around the vulva. The suture should be placed under the skin out where the woolless and wool areas meet.
4. Another means to keep the vagina “in” is to use a “ewe saver”. The “Ewe saver” is a plastic spoon shape blade that is placed in the vagina and the ends of the retainer are tied to tags of wool. The ewe can lamb over the retainer.
5. Using a harness method, a piece of twine or small rope is doubled over. The midpoint of the rope is placed on top of the neck’s base. The ends of the rope are crossed over and passed between the two front limbs. The ends are brought up under the elbows, over the ribs and then crossed over the back of the ewe. The ends are then passed between the udder and the hindlimbs and carried back up and crossed over in the area of the vulva. The two ends of the rope are then tied to the rope where it crosses the back. The pressure that the rope applies to the back and the area of the vulva will prevent the ewe from straining, keeping the vagina in place.
Treatment Information above from College of Veterinary Medicine, Virginia Tech
Lifting the ewe so you can put a prolapse back.
1. Lay the ewe on her side
2. Then get someone to grab the back feet and raise her rear end, keeping her head down.
3. If you can’t get an assistant, tie some baler twine to each leg and then across your back to do some lifting. It’s very hard on your back, but it’s worth the discomfort to get the lambs out without damage.
4. This allows the uterus and its contents to drop back down.
Lifting Information above from
Vaginal prolapses appear as a pink to red mass protruding from the vagina. These prolapses may appear when the ewe is laying down, but disappear when she stands.
Vaginal  Prolapse
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