Overview
1 Sexing on arrival, biological facts and pregnancy
2 Sows in season
3 Bonding, dominance and bullying
4 Health issues of the reproductive tract
1 Sexing on arrival, biological facts and pregnancy
Why the need to double-check the sex yourself?
Please always, always, always double-check the gender of any guinea pig upon arrival and before any bonding!
Mis-sexing is still sadly very common. This can happen at any stage, from not separating dads and baby boars in time at the breeder's, during transport to a pet shop or at the shop. This means that you can buy an already pregnant shop or breeder sow/
Please use our illustrated guide to re-check the gender. Always check the secondary areas as well (absence/presence of a penis ridge under the skin and presence/absence of a fleshy seal just below the opening of the slit), as they are usually unequivocal on the gender, which the arrangement of the genitalia often isn't. You can be 100% sure if you get the same answer re. absence of a boar penis ridge and presence of a sow flesh seal in sows - or the other way around in boars!
Our illustrated sexing guide will show you exactly where to look and what to look for: Sexing Guide
Some important biological facts you should know!
It is very important to know our biological facts with guinea pigs as there is still a lot of misunderstanding around, including with many general vets.
At which age start guinea pigs making babies?
Baby boars start making babies themselves between 3-5 weeks of age or even a little bit sooner if they are large and well developed, while sows have their first season at 4-6 weeks (or even a little bit sooner).
This coincides basically with the weaning!
Many for sale breeders and many general vets are sadly not aware of the fact that boars can reproduce before they reach sexual maturity when their testicles descend between 4-6 months of age, which is the age generally quoted in veterinary literature.
When and how often do sows come into season?
Sows come into season every 15-17 days (roughly every two weeks). This is called the oestrus cycle (US: estrus cycle).
In the presence of boar pheromones, sows can come into season spontaneously if they are close enough in the oestrus cycle.
That is why play dates, even under your supervision, don't work. Making babies takes only a few seconds and happens too quickly for you to intervene. Boars also have hooks at the tip of their penis to anchor it in case the sow moves away too soon; if you try to rip them off, you can injure them. Boars can only mate if the sow is willing, by the way. Any sows that could be potentially pregnant need to be treated as such until you know for sure otherwise.
Sows come into season again within hours of giving birth. If they are still with a boar when giving birth, you need to put them on a 10 weeks pregnancy watch and take very good care of them as back-to-back pregnancies are very hard on sows and really take it out of them. The risk of complications and miscarriage is also higher.
Please be aware that a newly neutered/de-sexed boar is only 100% safe six weeks after the operation. The little baby in my avatar is the surprise daughter from a supposedly safe over 5 weeks post-op boar (not one of mine), just to prove this particular point! There is a crucial difference between 'mostly safe' and 'totally safe' - and like a lottery win, it can happen to anybody. This recommendation follows best UK welfare practice, by the way, and has stood the test of time.
There is no menopause for either sows or boars!
They can make babies all their life long. The older they are, the higher the risk of miscarriage, dead-born babies and the death of the mother during birth or from birthing complications.
Pregnancy
A first pregnancy lasts on average about 10 weeks. This is also the observation period you need to put your sows on if they have had an accidental meeting with a full or too recently neutered boar until you know for sure otherwise.
You won't see generally see anything for about 7-8 weeks on average, depending on the size of the litter (a large litter will become noticeable sooner while a single baby may not show at all), and that is also the time when a vet can confirm a pregnancy reliably with a scan or x-ray.
Please be aware that about every fifth pregnancy ends with the death of either babies and/or mother even on the best of care. This percentage is going up quickly in less than optimal surroundings/ages. This is one of the main reasons why are a strictly no intentional breeding forum.
If you are worried about a pregnancy, please open an ongoing support thread for the whole duration of your pregnancy watch/until you need to separate any male babies in our pregnancy section, which is specially monitored by experienced and trustworthy members with a pregnancy signature.
You are welcome to ask any questions and concerns in your thread for as long as necessary to make sure that your sow and any babies are as well cared for as possible during the whole time. https://www.theguineapigforum.co.uk/forums/pregnancy-baby-care-and-sexing-no-breeding.11/
Please also read our comprehensive pregnancy, diet, birth and baby/mother care advice, which has been specially written for people without any previous experience and is as step-by-step and practical as we have been able to make it. Pregnancy & Baby Care Guide's
Our Pregnancy and Baby Care section and our information guides are only visible after you have registered with our forum and have agreed to our strict no intentional breeding policy.
Please note that any advice and support on this forum will only be given with the express aim to prevent any further pregnancies. Anybody found in breach of our very explicit no breeding rules will be summarily banned.
Terms of Service And Forum Rules
Our forum stance on breeding and showing explained: https://www.theguineapigforum.co.uk...-breed-showing-forum-policy-explained.134670/
1 Sexing on arrival, biological facts and pregnancy
2 Sows in season
3 Bonding, dominance and bullying
4 Health issues of the reproductive tract
1 Sexing on arrival, biological facts and pregnancy
Why the need to double-check the sex yourself?
Please always, always, always double-check the gender of any guinea pig upon arrival and before any bonding!
Mis-sexing is still sadly very common. This can happen at any stage, from not separating dads and baby boars in time at the breeder's, during transport to a pet shop or at the shop. This means that you can buy an already pregnant shop or breeder sow/
Please use our illustrated guide to re-check the gender. Always check the secondary areas as well (absence/presence of a penis ridge under the skin and presence/absence of a fleshy seal just below the opening of the slit), as they are usually unequivocal on the gender, which the arrangement of the genitalia often isn't. You can be 100% sure if you get the same answer re. absence of a boar penis ridge and presence of a sow flesh seal in sows - or the other way around in boars!
Our illustrated sexing guide will show you exactly where to look and what to look for: Sexing Guide
Some important biological facts you should know!
It is very important to know our biological facts with guinea pigs as there is still a lot of misunderstanding around, including with many general vets.
At which age start guinea pigs making babies?
Baby boars start making babies themselves between 3-5 weeks of age or even a little bit sooner if they are large and well developed, while sows have their first season at 4-6 weeks (or even a little bit sooner).
This coincides basically with the weaning!
Many for sale breeders and many general vets are sadly not aware of the fact that boars can reproduce before they reach sexual maturity when their testicles descend between 4-6 months of age, which is the age generally quoted in veterinary literature.
When and how often do sows come into season?
Sows come into season every 15-17 days (roughly every two weeks). This is called the oestrus cycle (US: estrus cycle).
In the presence of boar pheromones, sows can come into season spontaneously if they are close enough in the oestrus cycle.
That is why play dates, even under your supervision, don't work. Making babies takes only a few seconds and happens too quickly for you to intervene. Boars also have hooks at the tip of their penis to anchor it in case the sow moves away too soon; if you try to rip them off, you can injure them. Boars can only mate if the sow is willing, by the way. Any sows that could be potentially pregnant need to be treated as such until you know for sure otherwise.
Sows come into season again within hours of giving birth. If they are still with a boar when giving birth, you need to put them on a 10 weeks pregnancy watch and take very good care of them as back-to-back pregnancies are very hard on sows and really take it out of them. The risk of complications and miscarriage is also higher.
Please be aware that a newly neutered/de-sexed boar is only 100% safe six weeks after the operation. The little baby in my avatar is the surprise daughter from a supposedly safe over 5 weeks post-op boar (not one of mine), just to prove this particular point! There is a crucial difference between 'mostly safe' and 'totally safe' - and like a lottery win, it can happen to anybody. This recommendation follows best UK welfare practice, by the way, and has stood the test of time.
There is no menopause for either sows or boars!
They can make babies all their life long. The older they are, the higher the risk of miscarriage, dead-born babies and the death of the mother during birth or from birthing complications.
Pregnancy
A first pregnancy lasts on average about 10 weeks. This is also the observation period you need to put your sows on if they have had an accidental meeting with a full or too recently neutered boar until you know for sure otherwise.
You won't see generally see anything for about 7-8 weeks on average, depending on the size of the litter (a large litter will become noticeable sooner while a single baby may not show at all), and that is also the time when a vet can confirm a pregnancy reliably with a scan or x-ray.
Please be aware that about every fifth pregnancy ends with the death of either babies and/or mother even on the best of care. This percentage is going up quickly in less than optimal surroundings/ages. This is one of the main reasons why are a strictly no intentional breeding forum.
If you are worried about a pregnancy, please open an ongoing support thread for the whole duration of your pregnancy watch/until you need to separate any male babies in our pregnancy section, which is specially monitored by experienced and trustworthy members with a pregnancy signature.
You are welcome to ask any questions and concerns in your thread for as long as necessary to make sure that your sow and any babies are as well cared for as possible during the whole time. https://www.theguineapigforum.co.uk/forums/pregnancy-baby-care-and-sexing-no-breeding.11/
Please also read our comprehensive pregnancy, diet, birth and baby/mother care advice, which has been specially written for people without any previous experience and is as step-by-step and practical as we have been able to make it. Pregnancy & Baby Care Guide's
Our Pregnancy and Baby Care section and our information guides are only visible after you have registered with our forum and have agreed to our strict no intentional breeding policy.
Please note that any advice and support on this forum will only be given with the express aim to prevent any further pregnancies. Anybody found in breach of our very explicit no breeding rules will be summarily banned.
Terms of Service And Forum Rules
Our forum stance on breeding and showing explained: https://www.theguineapigforum.co.uk...-breed-showing-forum-policy-explained.134670/