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#19148 - 03/28/04 01:19 PM Embryonic Diapause
Anonymous
Unregistered


I have had gliders for 8 months now and recently my female has had two health beautiful joeys. However someone has told me that sperm can last in the female for up to a year. I am confused by this fact, is it true? since human sperm is only alive for 5 days. Can anybody clarify this for me?? being a biology teacher I feel really dump right now <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />


Edited by sugarlope (02/15/12 03:06 PM)
Edit Reason: changed title

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#19149 - 03/28/04 01:26 PM Re: Embryonic Diapause [Re: ]
Ellen Offline
Owner:Emeritus-Mother Hen

Registered: 08/05/99
Posts: 7603
Loc: Virginia Beach, VA.
I am not sure about the sperm. But it has been said and I have had a glider that held a joey in uturus for 3 mo. They say can can hold them up to 6 mo. They do this is if the Mom is not comfortable with her enviorment or if she has joeys in pouch.
But that means the sperm has already fertilized the egg.

My vet said (after I got one of my males neutered) that he could still impregnate the female up to 2 weeks after the surgery. But thats a different subject.

I will try and get you a better answer. In the meantime maybe someone can come along and give some real scientific information.
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#19150 - 03/28/04 07:25 PM Re: Embryonic Diapause [Re: ]
Anonymous
Unregistered


Honey, I've not heard of them holding the sperm, the embryo, yes but the sperm, no. It's called embryonic diapause, and possibly the person who told you about the sperm was confused. When a male is neutered, as with humans, it takes a bit to get all the sperm out of the system. So, yes there have been females impregnated after a neutering. Or possibly before the neutering and she simply held the embryo's in diapause till she was ready.
HTH What's rough is that there isn't much detail known about a lot of their specific reproductive systems.
Chey <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />

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#19151 - 03/28/04 07:48 PM Re: Embryonic Diapause [Re: ]
Anonymous
Unregistered


<img src="/ubbthreads/images/graemlins/wave.gif" alt="" /> I don't know the answer, but I do know that I had Sundown neutered, and now Katy has twins ITP. I was so surprised, and now I am so excited! <img src="/ubbthreads/images/graemlins/multi.gif" alt="" /> Angie

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#19152 - 03/28/04 07:50 PM Re: Embryonic Diapause [Re: ]
Anonymous
Unregistered


For information about diapause, I'd suggest doing general research on marsupials instead of specific details about gliders- because wallabies and kangaroos do this too <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> I think it's really neat, actually- and kind of crazy that a critter can birth a baby whose father died months before (a friend had this happen with one of her wallabies).

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#19153 - 03/28/04 07:52 PM Re: Embryonic Diapause [Re: ]
Anonymous
Unregistered


Short blurb on this with kangaroos, but I think the basics apply to Suggies too...

"An unusual feature of reproduction in kangaroos is embryonic diapause. During diapause a viable embryo is carried in the uterus for long periods (many months) with its development stunted at the stage of a blastocyst, which consists of some seventy to a hundred cells and is only about a quarter of a millimetre in diameter. Because of the extension of the gestation period into the pro-oestrus phase of the next ovulation, mating and ovulation can occur a day or two after birth. (The Grey kangaroos are an exception to this pattern, with the Western grey's not showing diapause at all.) The embryo produced following this post-partum mating will not successfully develop past the blastocyst stage until a specific signal is given. If a young has not taken up residence in the pouch and started to nurse there is a specific pulse of progesterone secretion about six days after birth. The pulse is necessary if the blastocyst is to continue development. If there is a young suckling in the pouch then lactation inhibits the corpus luteum via the hormone prolactin. The corpus luteum then becomes quiescent and no pulse of progesterone occurs and the blastocyst enters diapause. It will only recommence development when the lactational inhibition is removed, either by loss of the pouch young or by the reduced lactation toward the end of the pouch life."

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#19154 - 03/29/04 03:00 AM Re: Embryonic Diapause [Re: ]
Anonymous
Unregistered


[:"blue"] Dr. David Lindenmayer in his book "Gliders Of Australia" specifically states the the Feathertail Glider is the only glider known to exhibit the characteristic of embryonic diapause and I have seen people state that gliders can store sperm like some other members of the animal world. At this point in time, I'm not satisfied that we really know for sure what is going on. It might be interesting for someone to email an Australian authority..... maybe someone at Haelesville Sanctuary..... and see what they have to say.

As to neutered males impregnating females, Judie just posted on that subject recently and I "think"(?) she said some gliders remained potent for as much as 2 months after the operation. You can search for her post or maybe she will see this thread and comment.

Here is a link to an old GC thread on the subject.

EMBRYONIC DIAPAUSE

I don't remember ever seeing a follow-up by JA with any further information on the subject???

I hope someone can come up with some concrete information. This is a fascinating subject and it would be great to get some definitive information!!!

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#19155 - 03/29/04 04:11 AM Re: Embryonic Diapause [Re: ]
Anonymous
Unregistered


</font><blockquote><font class="small">Quote:</font><hr />
Short blurb on this with kangaroos, but I think the basics apply to Suggies too.....

<hr /></blockquote><font class="post">

[:"blue"] The information presented by ShadysMum on the reproductive system of kangaroos is interesting; but it is not obvious to me why facts about the reproductive process of a kangaroo are applicable to a sugar glider simply because they are both marsupials? Would you accept the proposition that the reproductive process of a Golden Retriever is applicable to a human being because both are mammals? When is the last time you heard of a human female bearing a litter of 12 offspring??? I'm not a biologist; but I seem to remember that snakes, which all look alike to me, generally lay eggs but some are live bearers? I really think we need to find definitive information on Sugar Gliders and not speculate based on information about dissimilar animals. [/]

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#19156 - 03/29/04 05:05 AM Re: Embryonic Diapause [Re: ]
Pockets Offline
Glider Slave

Registered: 01/02/00
Posts: 2092
Loc: Lone Star State
"Gliders of Australia" is a very nice publication!

My research also shows feather-tailed gliders exhibit diapause but not our sugar gliders <img src="/ubbthreads/images/graemlins/littleglider.gif" alt="" />

Embryonic diapause - Lactational quiescence - my personal library contains several books that directly pertain to this subject & my recommendation to those who would like a further in depth understanding of this subject, would be the following publication -

"Reproductive Physiology of Marsupials"
Huge Tyndale - Biscoe, Marilyn Renfree


I believe if you check both authors credentials,you will be impressed & will find them to be quite knowledgable in marsupial reproduction.

ASAP I will be contacting a USA university, as I am interested to learn exactly where they obtained their posted information on marsupial diapause, I believe it to be quite incorrect
_________________________
:grey: We will be known forever by the tracks we leave :grey:
http://www.marsupialsociety.org

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