[ScotsGirl]

I have only had two types which have prolapsed. One was a Southdown X which had a badly assisted birth and had a full prolapse due to continued contractions, result was being put down as vet repair went horribly wrong.
 
My mule had a vaginal prolapse last year which the vet said was down to overfeeding of hay.  She went on to have triplets and wasn't carrying much weight.  This year she had a very slight sign of prolapse a day or two before delivery when I started feeding her hay.  So maybe hay was the problem.  She was only carrying twins this year though.

[Hazelwood Flock]

I have never had a prolapse in the Greyface Dartmoors (yet!), but a Poll Dorset ewe I had always popped out a grapefruit 3 weeks before lambing - inserted a spoon and all was well. Put up with it for 3 years then she had ringwomb so went on.

[Mallows Flock]

What you need is somebody with mules....... 

OMG Steve... don't say that....  |I have just bought a small flock of mule ewe lambs to be my breeders next year! 

[omnipeasant]

We never have prolapses in the badger faced welsh. The mules are prone to this but over feeding seems to be just as important as breeding. We never lamb a ewe again after she has prolapsed, or keep her progeny. I think that is why we get very few.

[sp435]

Wow.. You guys are more responsive than seniors here (FYI - seniors ~ higher authority not age) 

Okay.. now my question to y'all -

- Hilly areas - Does that lead to higher incidences of prolapse in your ewe?
- Mineral Imbalance - Does this play a factor? If so, then does it have additional effects too?
- Type - Which type of prolapse is more common - vaginal or uterine?
- Age - Is it more frequent in older ewes?
- Birthing - is it a factor? dystocia? may be?
- Offsprings - More the number, higher the chances of prolapse - yes or no?
- Docking of the tail - does it increase the chances of prolapse?

I'm sorry for the list of questions, but I have to explore a lot in a small topic. Hence, I'm looking for a possible cause that is unexplored and my work would throw light on it.

I would like to thank everyone again for their valuable comments and responses. I really appreciate your help. From these personal experiences I can narrow down my search and jot down the possible etiology (causes) of prolapse in ewe.

Sincerely
PhD

[SallyintNorth]

What you need is somebody with mules....... 

OMG Steve... don't say that....  |I have just bought a small flock of mule ewe lambs to be my breeders next year! 

Don't panic Mallows - of our 8 prolapses, not a one of them was amongst our 26 mules.

Having said which, on the moorland farm I did get prolapses amongst the mules - maybe 2 or 3 in 80 each year - but they nearly always happened once they were indoors getting ad lib hay / silage. 

Key things to note about mules - yes they are greedy (none of my collies is prepared to be on the ground between a mule and her cake  ) but they are very friendly and delightful at the same time.  Don't flush them before or during tupping if you don't want too many triplets, feed to condition (never have a pregnant mule more than condition score 3), do scan if you can (otherwise assume all twins and you'll be 98% right!  ), don't cake single-bearers (if you know who they are), and with the twin-bearers, in the month before lambing, split their cake into two feeds.  And do feed twin-bearers plenty of cake - on the moorland farm we fed 2lb per head in the last month, split into two feeds - so they have less need of forage for their dietary requirements.  Make sure they've always got the appropriate energy/mineral lick available too.  It's eating too much grass, hay or sliage that blows them up and makes there not be enough room for the developing lambs.

[Mallows Flock]

Thanks Sally... I do tend to 'do' my sheep a little well... hence me keeping well away from Jacobs etc.  I will bear my feeding and flushing in mind. But you are right... they are VERY VERY greedy and incredibly delightful! I am completely in love with them already 
Lisa