Post Number: 15
|Posted on Wednesday, May 17, 2006 - 09:32 pm: ||
Is ther such a thing as identical twinning in horses? I have one source, a vet, who says no. I have another source, an article, who says yes. Whats the story on this?
Post Number: 605
|Posted on Wednesday, May 17, 2006 - 09:39 pm: ||
lori, I have heard that you can get on from time to time , but most often not, normally they are in different sacs. ?
Post Number: 10663
|Posted on Thursday, May 18, 2006 - 12:20 pm: ||
There have been literally 3 or 4 confirmed cases of naturally occurring identical twins in the equine.
As a result of the presence of a structure that surrounds the conceptus from about day 7-21, the equine developing embryo does not undergo a process called "hatching out" which is seen in other species. In that process, the embryonic cells break out through the surrounding zona pellucida (outer shell of the original oocyte), and may be squeezed to the point where the embryonic cell mass breaks in half during that process. As each of those cell masses contain basal cells with the same DNA, this is how identical twins are formed. Because of the surrounding structure, the capsule, in the equine, there is no "hatching out" process, and hence no formation of identical twins. There are always however rare phenomena in nature, and yes, there have been - as I noted above - 3 or 4 cases, so "never say never", but you can almost in this case...
Post Number: 20
|Posted on Monday, May 22, 2006 - 01:23 pm: ||
Are there any articles or studies published about this? I would love to read about it.