Determination of Gender by Placement in Uterus

[Yorkiemom1]

Originally Posted by magicgenie

OK, well, I have no medical training other than what breeding Yokies has exposed me to, so asking for x-ray with bitch on her back so I can predict gender isn't something I would have thought of. When I get a prenatal x-ray it's mainly to calm my own nerves. When they say it's only one big whelp I get very scared and line up help for a c-section. When they say it looks like 5 or more I recruit extra hands-on help to clean them up. get them breathing, and keep me breathing. My vet is a very smart man and I will discuss this with him at some point.

See if he will keep score on c-sections he does, to see what percentages he gets with first hand experience, as it correlates to published data......majority of males are from the right horn, majority of females are from the left horn. My vet is going to do this in her practice, for 2015! Evidenced based outcomes!

[magicgenie]

[QUOTE=Yorkiemom1;4514719]See if he will keep score on c-sections he does, to see what percentages he gets with first hand experience, as it correlates to published data......majority of males are from the right horn, majority of females are from the left horn. My vet is going to do this in her practice, for 2015! Evidenced based outcomes![/QUOTE

First, I'll ask him how to use prenatal sexing of my whelps to improve my breeding. If there is a good health related reason to determine sex ahead of birth, I'll certainly take the extra trouble of getting a fancier pre-natal x-ray. Dr. K has a very busy practice. I somehow doubt he'll be enthusiastic about tracking sex of his c-section deliveries, but I'll mention it. I do know he'll do it if there's a valid reason to.

[Yorkiemom1]

[quote=magicgenie;4514798]

Originally Posted by Yorkiemom1

See if he will keep score on c-sections he does, to see what percentages he gets with first hand experience, as it correlates to published data......majority of males are from the right horn, majority of females are from the left horn. My vet is going to do this in her practice, for 2015! Evidenced based outcomes![/QUOTE

First, I'll ask him how to use prenatal sexing of my whelps to improve my breeding. If there is a good health related reason to determine sex ahead of birth, I'll certainly take the extra trouble of getting a fancier pre-natal x-ray. Dr. K has a very busy practice. I somehow doubt he'll be enthusiastic about tracking sex of his c-section deliveries, but I'll mention it. I do know he'll do it if there's a valid reason to.

Prenatal sexing of a litter may not be helpful with your breeding program. I wouldnt bother with it if it did not assist me in my program. Fortunately, my vet does become actively involved with research and statistics in reproduction and breeding programs, and anything she can do easily, that will provide information for her breeders, she is more than happy to help. She indicated it would not slow down her c-sections at all to make a quick, simple note about left and right horn sexing.....she also uses dictation during her surgeries, so it is actually just part of her procedure to say "male from right" or "female from left". While she has 6 other vets in her large practice, she is the only one that will be following this with me. If knowing your sexes for, say waiting lists for your babies, then it is probably not anything you would be interested in. I can move people around on waiting lists and give my people a very good idea when they can expect their baby to be born and from what litter, so it benefits my program.

[bjh]

I find it hard to believe that is nothing but coincidental if male pups are coming from just the right horn. It is an interesting subject though.

It is the male that determines the sex so I would figure it is just a matter of which sperm gets there first, male or female. It is my understanding that after the bitch is bred the female sperm live longer than the male sperm do. I have noticed that if I breed a bitch early in her heat cycle that she tends to have more female pups. I thought perhaps because by the time the bitches eggs have dropped that only the female sperm are still alive. Of course that is just my theory and it does not always work. It could be just coincidental also. I have had litters of all males and litters of all females and many mixed sex litters.

Most of the time when I breed a female I try to breed her around the 9th day of her heat cycle if she will accept a male. Then I will skip two or three days before breeding her again. It just seems like I get more female pups by doing it that way.

[Yorkiemom1]

I had first heard this theory years ago at a reproduction seminar...so I started reading literature on the idea, and it does work out to be reasonably accurate! There was alot of material I couldnt get to because it was for vets....and while not completely absolutely a fail safe way of predicting male/female pups, it seems to work out that way majority of the time. I fully intend to try your system of breeding early in cycle to see if I get more females.....I NEVER have enough females.....everyone wants females!

[Cares4Dogs]

Hello yorkiemom1. Its been a while.

My girl had 2 litters of 2 pups......all pups were girls. Both times, the x-rays showed one pup in each uterine horn. Although, I didnt read all posts in this thread and not certain if this has been discussed, could it be not the left or right horn, but rather the placement in the horn?? (did that make sense?)

I did find that the dash-dash vs. dot-dot on auscultating the heartbeats was accurate in predicting they were all females.

[smartpuppiepets]

Very very cool observation!
Thanks for sharing it 😉
Xoxo