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05-19-2006, 09:55 AM | #1 |
YT 3000 Club Member Join Date: Feb 2006 Location: El Paso, Texas
Posts: 3,065
| Studs determine sex, Female determines # I was just reading an article from debbie jensen's site and it said that the stud determines the sex of the puppies and the mom determines the number. I always knew that the female determined the number, but I don't remember ever hearing that the male determined the sex. Since there is definitely a higher demand for females - have you ever took into consideration whether a stud produced more females than males? |
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05-19-2006, 10:05 AM | #2 |
Stewie Rox the Sox Donating Member Join Date: Feb 2005 Location: Chicago
Posts: 6,306
| Well, that is logical because it is the same in humans. The father's sperm has the X and Y chromosomes and the mother's eggs are all X's... The number depends on how many eggs mother drops at the time of conception.
__________________ Kristy & Stewie |
05-19-2006, 12:09 PM | #3 | |
Donating Senior Yorkie Talker Join Date: Nov 2005 Location: Texas
Posts: 778
| Quote:
You are totally correct on this, by my reasearch and vets. If I would consider a stud that produced more females.....no.....I think let nature take its course. | |
05-19-2006, 01:42 PM | #4 |
YT Addict Join Date: Nov 2005 Location: OK, but Texas soon!
Posts: 326
| I have also heard the same thing. My vet verified this as well. |
05-19-2006, 01:53 PM | #5 | |
Phantom Queen Morrigan Donating Member | Quote:
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05-19-2006, 03:38 PM | #6 |
Donating YT 14K Club Member | I think it IS possible for some males to produce more females than males and vice versa. How do you know when picking out a male? You don't. With Chester, out of 9 pups, 8 were female and only 1 was male (2 litters). But, who's to say...could just be luck of the draw, temperature changes, etc.
__________________ As always...JMO (Just My Opinion) Kimberley |
05-19-2006, 04:22 PM | #7 |
YT Addict Join Date: Apr 2005 Location: Big Spring, Texas
Posts: 403
| Well ya know that is the way with use humans, so why not in animals.
__________________ DaniBelle owned by Skittles & Choco latte & Chico Stik |
05-20-2006, 11:27 AM | #8 | |
Donating Senior Yorkie Talker Join Date: Nov 2005 Location: Texas
Posts: 778
| Quote:
It IS possible for some males to produce more males and vice versa. Still basically the conditions along with the amount of "x" and "y" in the male. They may have strong "x" or strong "y". | |
05-20-2006, 03:31 PM | #9 |
Donating YT 12K Club Member Join Date: Jan 2006 Location: Council Bluffs Iowa
Posts: 12,552
| The timing of the breeding could make a difference too. There are normally more male sperm, and they are better swimmes, but the female sperm live longer. So if bred when the eggs are present, chances of getting a male are better. If bred before the eggs are present the better chance of getting a female. |
05-20-2006, 03:41 PM | #10 | |
YT 3000 Club Member Join Date: Feb 2006 Location: El Paso, Texas
Posts: 3,065
| Quote:
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05-20-2006, 04:41 PM | #11 |
Inactive Account Join Date: Jan 2005 Location: MD
Posts: 2,985
| The sperm carry the chromosomes and they live as long as they live whether or not the ova are present..I don't think there are male sperm and female sperm. Each sperm carries chromosomes X and Y so the timing might not have any effect on the sex of the puppies. I know a bit about genetics of both humans and animals but not an expert. Would someone let me know if there is a source of info for this. Maybe Stacy will see this and can add her expertise.. |
05-20-2006, 05:22 PM | #12 |
YT 3000 Club Member Join Date: Feb 2006 Location: El Paso, Texas
Posts: 3,065
| I found this which does support JeanieK's post. The sex of your baby is established at the moment of Conception. Dad's sperm chromosome compliment determines sex of baby. It is dependant on whether a "Y" chromosome containing sperm fertilizes the egg or an "X" chromosome containing sperm fertilizes the egg. Mom only has one type of egg - one with an "X" chromosome. If a baby has 2 "X" chromosomes, it's a girl. An XY chromosome pair is a boy. The XX sperm ( female) tend to 'swim' slower, but live longer. The XY sperm (male), 'swim' faster, but die sooner. That is why it is said, if a woman is trying for a girl baby, to have sex a few days before her fertile day, that way when her fertile day comes, all the male sperm would have died off, leaving only the female sperm. If try for a boy, it is recommened to have sex only on the fertile day. Some studs seem to know intuitively the ovulation timing so I guess those studs would most likely produce males. One that is not so intuitive may breed before actual ovulation, thereby producing more girls. I guess you could influence the sex to some degree through ovulation testing and controlling the fertilization process by artificial insemination. |
05-20-2006, 05:30 PM | #13 | |
Donating YT 4000 Club Member Join Date: Jan 2005 Location: Portland Oregon
Posts: 4,405
| Quote:
http://www.barkbytes.com/medical/med0084.htm
__________________ Kimberly | |
05-20-2006, 05:37 PM | #14 |
YT 3000 Club Member Join Date: Feb 2006 Location: El Paso, Texas
Posts: 3,065
| Does everyone follow the protocol of 10th, 12th and 14th day mating? If you only mate once it would seem that the majority of puppies would be female since the female sperm live longer. Has anybody noticed this being the case when only having one mating? |
05-21-2006, 04:12 PM | #15 |
Donating Senior Yorkie Talker Join Date: Nov 2005 Location: Texas
Posts: 778
| With my last litter of 7, there were only 2 matings in a row. One on day 10 and one on day 11. We have 4 girls and 3 boys. |
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