what causes false pregnancy?

crazi4horses · 05-10-2004, 02:28 PM

Ashley n i were talking about it, and how fustrating it would be if you think your mare is in foal but its false. What causes them to have a false pregnancy tho?[list]

Blistering Winds · 05-10-2004, 02:44 PM

HOrmones. Ever heard the saying, Mind over matter? It is true!!!

Basically, there MIGHT have been a pregnancy, but for some reason, was absorbed. But the body still thinks it is there. So progesterone continues to produce, nothing is there to kick the CL out of production of progesterone (prostaglandin F2alpha is supposed to do that) and the CL remains. The ONLY thing that doesn't occur, is the ECG is not there. Unless there is a partial pregnancy, then, well, everything is haywired!!

crazi4horses · 05-10-2004, 02:46 PM

Whats partial pregnancy? How can they be Half pregnant? Lol..sorry, that isnt meant to sound rude, or smart alecky if it comes across that way.

Lou3 · 05-10-2004, 03:06 PM

A foal can be reabsorbed really early on - i think this is what BW meant by a partial pregnancy.
basically a false pregnancy is caused by the failure of the corpus luteum to regress when the uterus is gravid (empty) after a heat cycle. The corpus luteum is the part of the ovary that produces the hormones necessary to maintain pregnancy. (although in some animals these are also produced by the placenta) Its extremely commonplace in dogs and not unheard of in some other animals such as horses and rabbits.
Lou

Blistering Winds · 05-10-2004, 03:12 PM

Sometimes, the placenta can remain and the "fetus" not develop either. That would be what I consider a "partial" pregnancy.

Lou3 · 05-10-2004, 03:15 PM

ok - that must be quite rare is it BW i've never heard of it - educate me further pleeease. *sitting on edge of seat awaiting reply*
Lou

Blistering Winds · 05-10-2004, 03:41 PM

This is how it was explained to me.

Basically, you have the 2 sides of the Embryo. The Trophoblasts and the Inner Cell Mass. The Trophoblasts give rise to the PLacenta, and the ICM gives rise to the fetus. Well, if the Trophoblasts work, and the ICM doesn't, then you can have a partial for a while. Usually, the body absorbes them, but rarely, they are maintained and just nothing develops on the fetus side. Or it reaches a certain stage and stops developing.

Twins can have this happen as well. So you can have I guess 1.5 pregnancies??. I had it happen, or so I was told as a Theory of what happened. Had my second kid. All the placenta and stuff was out. Well about 2 months later, I passed a small mass. Come to find out, it was a full placenta, early early stages, never completely developed. With ultrasound, found the connection spot. Doc said I absorbed the rest of it, but placenta never absorbed. Developed, then just stayed. Body finally said GET OUT!! needless to say, I was freaked out over the whole process and docs. Thought they "forgot" something. Could have been the other placenta attached and grew over it, or it was right next to the other placenta, so they never found it. Oh well, done and over with. Anyways.

Lou3 · 05-10-2004, 03:52 PM

ok thanks that makes it clearer.

Blistering Winds · 05-10-2004, 03:54 PM

Not that you really wanted to know about me.

SOrry.

05-10-2004, 02:28 PM	#1
crazi4horses Senior Member+ Join Date: Sep 2003 Location: First left, then first stall on the right Posts: 4,633 Images: 259	what causes false pregnancy? Ashley n i were talking about it, and how fustrating it would be if you think your mare is in foal but its false. What causes them to have a false pregnancy tho?[list] __________________ Honey --- One man's wrong lead is another man's counter-canter.

05-10-2004, 02:44 PM	#2
Blistering Winds Senior Member+ Join Date: Oct 2003 Location: Augusta, Kansas Posts: 31,979 Images: 831 Blog Entries: 17	HOrmones. Ever heard the saying, Mind over matter? It is true!!! Basically, there MIGHT have been a pregnancy, but for some reason, was absorbed. But the body still thinks it is there. So progesterone continues to produce, nothing is there to kick the CL out of production of progesterone (prostaglandin F2alpha is supposed to do that) and the CL remains. The ONLY thing that doesn't occur, is the ECG is not there. Unless there is a partial pregnancy, then, well, everything is haywired!! __________________ HGS is a very powerful, addicting place that is just as bad as cigarettes, however healthier for you AND your horse.

05-10-2004, 02:46 PM	#3
crazi4horses Senior Member+ Join Date: Sep 2003 Location: First left, then first stall on the right Posts: 4,633 Images: 259	Whats partial pregnancy? How can they be Half pregnant? Lol..sorry, that isnt meant to sound rude, or smart alecky if it comes across that way. __________________ Honey --- One man's wrong lead is another man's counter-canter.

05-10-2004, 03:06 PM	#4
Lou3 Senior Member+ Join Date: Oct 2003 Location: england Posts: 7,532 Images: 32 Blog Entries: 1	A foal can be reabsorbed really early on - i think this is what BW meant by a partial pregnancy. basically a false pregnancy is caused by the failure of the corpus luteum to regress when the uterus is gravid (empty) after a heat cycle. The corpus luteum is the part of the ovary that produces the hormones necessary to maintain pregnancy. (although in some animals these are also produced by the placenta) Its extremely commonplace in dogs and not unheard of in some other animals such as horses and rabbits. Lou __________________ Save the Earth . . . it's the only planet with chocolate FFFL

05-10-2004, 03:12 PM	#5
Blistering Winds Senior Member+ Join Date: Oct 2003 Location: Augusta, Kansas Posts: 31,979 Images: 831 Blog Entries: 17	Sometimes, the placenta can remain and the "fetus" not develop either. That would be what I consider a "partial" pregnancy. __________________ HGS is a very powerful, addicting place that is just as bad as cigarettes, however healthier for you AND your horse.

05-10-2004, 03:15 PM	#6
Lou3 Senior Member+ Join Date: Oct 2003 Location: england Posts: 7,532 Images: 32 Blog Entries: 1	ok - that must be quite rare is it BW i've never heard of it - educate me further pleeease. sitting on edge of seat awaiting reply Lou __________________ Save the Earth . . . it's the only planet with chocolate FFFL

05-10-2004, 03:41 PM	#7
Blistering Winds Senior Member+ Join Date: Oct 2003 Location: Augusta, Kansas Posts: 31,979 Images: 831 Blog Entries: 17	This is how it was explained to me. Basically, you have the 2 sides of the Embryo. The Trophoblasts and the Inner Cell Mass. The Trophoblasts give rise to the PLacenta, and the ICM gives rise to the fetus. Well, if the Trophoblasts work, and the ICM doesn't, then you can have a partial for a while. Usually, the body absorbes them, but rarely, they are maintained and just nothing develops on the fetus side. Or it reaches a certain stage and stops developing. Twins can have this happen as well. So you can have I guess 1.5 pregnancies??. I had it happen, or so I was told as a Theory of what happened. Had my second kid. All the placenta and stuff was out. Well about 2 months later, I passed a small mass. Come to find out, it was a full placenta, early early stages, never completely developed. With ultrasound, found the connection spot. Doc said I absorbed the rest of it, but placenta never absorbed. Developed, then just stayed. Body finally said GET OUT!! needless to say, I was freaked out over the whole process and docs. Thought they "forgot" something. Could have been the other placenta attached and grew over it, or it was right next to the other placenta, so they never found it. Oh well, done and over with. Anyways. __________________ HGS is a very powerful, addicting place that is just as bad as cigarettes, however healthier for you AND your horse.

05-10-2004, 03:52 PM	#8
Lou3 Senior Member+ Join Date: Oct 2003 Location: england Posts: 7,532 Images: 32 Blog Entries: 1	ok thanks that makes it clearer. __________________ Save the Earth . . . it's the only planet with chocolate FFFL

05-10-2004, 03:54 PM	#9
Blistering Winds Senior Member+ Join Date: Oct 2003 Location: Augusta, Kansas Posts: 31,979 Images: 831 Blog Entries: 17	Not that you really wanted to know about me. SOrry. __________________ HGS is a very powerful, addicting place that is just as bad as cigarettes, however healthier for you AND your horse.

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