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Pk2216 t1_j6jr4ok wrote

Ooooh, that's pretty interesting.

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Seeksp t1_j6jrn4y wrote

Typically both are infertile.

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[deleted] t1_j6js18o wrote

Where I would I work where this would be NSFW?

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awawe OP t1_j6jsdck wrote

I guessed squeamish people might find it off-putting. I removed the NSFW tag anyway because you're right, there really isn't anything explicit about the post.

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katharsisdesign t1_j6jwukq wrote

This makes Dwight's comment on the office about how to induce a male birth more funny.

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Yurekuu t1_j6k1jdr wrote

Apparently it does affect the twin somewhat but nowhere near the amount it affects most other mammals. It might be because we take so long to develop and that sex differences aren't so huge at a younger age for humans? That's just a guess from me though.

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Redpandaling t1_j6k947w wrote

Probably not. At best, you get hormones passed from the baby through the mom and then to the other baby, but that blood travels a very significant distance between the two babies, which should substantially dilute the hormones.

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Ok-Table-3774 t1_j6kfp9i wrote

Yea, it's called a Freemartin. This happens a lot of in cows and other ruminants but not so much human due to how the placenta forms and the blood share. I used to work in a genetics lab that offered freemartin testing to cattle breeders to confirm this. A lot of times the females look normal on the outside but when mating is attempted, it either doesn't happen (no internal vagina), or the mating isn't successful (female is infertile). Sadly most freemartin calves are euthanized.

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Roadkinglavared t1_j6kp21b wrote

Where we live, if the female twin is born first it is assumed she can breed. If she is born second, then she is a freemartin. Another way to say it is if the heifer is bigger then the twin bull calf, chances are great she can breed. If born second they are raised like the steers for beef. Our vet said that most farmers don't test their freemartins and while the numbers state 80% chance the female born second will be a freemartin, he said not enough farmers give the female a chance so the numbers are most like no 100% correct. Sometimes you can tell the heifer is a freemartin and other times it's all in inside workings that you cant see. I remember hearing one farmer who kept his freemartin for beef and she was running with the bulls and steers. She got pregnant and he kept her as a breeding cow.

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Kooky-Cry-4088 t1_j6kqzgw wrote

Most freemartin calves are not euthanized, in fact none are nor should be unless other congenital/genetic defect exist such as PHA, cleft palate etc. They are fed and harvested as beef. No ovarian hormone production so actually feed similar to a steer. I’m specifically a bovine veterinarian in the heart of cattle country.

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gwaydms t1_j6ktz2j wrote

I saw one on Dr. Pol where a bull tried to mate with a freemartin (the owner didn't know that's what she was). Vet closed the wound and she was raised as a steer. Away from the bull!

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Naxela t1_j6kuqgj wrote

Why would the male be affected? There's no source that could cause demasculinization in this scenario. Only the male twin is producing disruptive hormones here.

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AlphabearPSK t1_j6kxelt wrote

It does not happen a lot in other ruminants. Considering we want at a minimum twins in small ruminants, this occurring would be detrimental. In 29 years of raising sheep and goats, I have never had a freemartin.

On top of that, if it were to occur they wouldn't just euthanize the calf/kid/lamb since it is perfectly healthy. They would try breeding if they were uncertain of freemartinism occurring and if it wasn't successful it would then become meat.

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fermango t1_j6l2mz9 wrote

Looked it up. Apparently in 0.1% of male/female twins they can be identical. But this means that the female ends up "losing" a chromosome and rather than becoming XX when the egg splits she is XO. They call this Turner Syndrome and it can lead to a range of medical issues including infertility, just like the cows mentioned above.

In 99.9% of cases involving male/female twins they are non-identical and do not share a placenta so the female is no more likely to be infertile than in singular female babies.

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baconseedsower t1_j6l3aqh wrote

I still have the male twin from a pair I bottle raised. They were born full size and the cow had them unassisted. The farmer found her later trying to figure out which was hers. Ultimately he took them both and gave them to me to raise. The heifer was a freemartin and a jerk. She went to auction at about butcher age. Her brother had been hypoxic at birth, we think he was the second one and took too long to come out. It caused brain damage that made him dumb and lovable, so we trained him as a work animal, but mostly he's an oversized pet.

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anarchyreigns t1_j6l4mrl wrote

The key here is that we need to understand that humans have hormonal influences on their offspring during pregnancy, these influences can result in gender disparities that may make a child feel as though they are misgendered. I wish that people could understand that a person born of one “sex” may never be able to adapt to being that person.

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gwaydms t1_j6l7k1z wrote

A freemartin often doesn't have internal reproductive organs. A blind passage ends without connecting to anything else, like the unfortunate bovine's vagina. That's why she was injured by the bull.

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ChocolatDip t1_j6layg1 wrote

I can't imagine what its like being pregnant with twins for a cow. 😭 They probably sleep all day and doesn't want to move

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Livingmorganism t1_j6lesu9 wrote

You can also keep the freemartin females and use them as gomers for heat detection. They like to hump.

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delicatearchcouple t1_j6lh1ji wrote

Well I'll just reply to myself since you're such a tender little thing that you went and blocked me...

Do you buddy. Just not going to get you anywhere and going to further alienate yourselves as evidenced by everything you cited.

Remember how no one gave a fuck about drag shows until every headline had to mention trans people? Then you get the backlash from the ignorant minority and they double down and rally their troops against you.

Then the general public has trans fatigue and is less helpful to your cause, more quick to dismiss your issues, and eager to focus on anything else but the constant background noise of finger pointing and victim identity. The focus is on the stupid one liner bullshit and not on the actual suffering of the folks you care about.

So you have whipped your enemies into a fervor (knowing that they currently have more power than you) all while alienating and exhausting potential allies.

If this is the approach that makes the most sense to you, then get it. Do you.

I just don't see it as effective. Seems to be a poor choice pragmatically.

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RealDDDeal t1_j6ljy6o wrote

Is this true of all bovines, including wild ones? Bison and buffalo as well? Are these fertility phenomena related to their husbandry or domestication breeding practices over time?

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audreyba123 t1_j6lm864 wrote

I just read the article you linked, but it says there’s no difference. “SUMMARY Women with a male co-twin had the same chances of being pregnant and having children compared to same-sex twin pairs.”

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nrith t1_j6lp201 wrote

This is more than I needed to know about cattle.

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wolfie379 t1_j6lpiqf wrote

Note that twin births among cattle are rare. In the Old West, one cowboy telling another “your cow had twins” would usually result in a fatal case of “lead poisoning” - since “twins” usually meant that there was a cow wearing a different brand bawling for its lost calf.

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KmartQuality t1_j6lqdhg wrote

there is a lengthened tuft of hair at the ventral tip of the vulva in a freemartin heifer

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pdieten t1_j6ls2de wrote

Depends on your definition of raised, I suppose, when I lived on the family Holstein dairy farm my parents would usually ship male Holstein calves out early for veal.

The cows were usually artificially inseminated with Holstein semen, but we kept a Hereford bull on the farm to keep the cow producing in case artificial means failed. The Hereford was much more docile than Holstein bulls so it was safer to keep him around, but the offspring of that mating were sterile so they'd be raised to 1000# as steers and either shipped or we'd keep it for ourselves if we were low on freezer beef.

Can't remember what was done with freemartins. It was a lot of decades ago.

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SleeplessTaxidermist t1_j6lty9u wrote

Not all that rare nowadays. I believe dairy breeds are more prone to them than beef cattle. It's not uncommon for a cow to reject one of the calves. I see plenty of twin calf posts in my farming and cattle groups during the seasons.

MORE than two is rare and strange. Twin heifers is the lottery.

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pdieten t1_j6luacs wrote

Was a long time ago, I could be mistaken. The females definitely wouldn't produce. I suppose the males probably weren't sterile because the vet had to come around with the beefmaker to castrate them, but the mixed breed steers always yielded good beef.

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Diplodocus114 t1_j6lwdu9 wrote

Those Hereford bulls were so docile. Local farmer had a 'Bull warning' on his field with a public footpath through.

The massive thing merely stayed with his harem and ignored passsers-by. He would sometimes approach for treats and scare people who didn't know him.

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Nazamroth t1_j6lwlbh wrote

Huh, would you look at that. Just this morning I was wondering what would happen if someone got flooded by both male and female hormones but didnt feel like googling it.

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Diplodocus114 t1_j6lwve9 wrote

We had heifers and bullocks here. Both referring to young cattle not yet suitable for breeding. The bullocks were sent for slaughter.

A female was then called a 'cow' once she had a calf and deemed suitable for milking.

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[deleted] t1_j6lxtu6 wrote

Does that calf want to be called they/them?

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Kooky-Cry-4088 t1_j6lyhm2 wrote

Someone already answered it but bulls are still fed out. They don’t gain as quickly but they’re still worth $2500 a piece at time of harvest… Holstein also is some of the highest marbling meat you’ll find grades choice and prime more often than many other cattle just takes more time and feed.

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CurrentDismal9115 t1_j6lyixe wrote

Well that can't possibly be true. Nothing can defy the rules of "basic biology" that I learned in 4th grade! /s

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baconseedsower t1_j6m248c wrote

No, cows generally have one and many don't survive having twins. I don't remember the exact amount but less than 5% of births are twins, and usually they are undersized due to lack of space. The fact this girl managed to have full size twins unassisted with both babies and momma surviving is shocking.

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kelldricked t1_j6m38qd wrote

I always love watching that show untill he picks the gloves and shoves his entire arm into the hole of a cow, donkey or horse.

Then i suddenly regret watching it, while eating and pretend like the show doesnt exist for 3 months. Then i forget why i never watch it and the cycle repeats.

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Blimeydog t1_j6m3o27 wrote

You say intersex, I say veal.

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airfryermasterrace t1_j6m576x wrote

Is this how intersex people are created? Can this be identified and prevented during early pregnancy?

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Carnivorous_Mower t1_j6m9slt wrote

Yep. I worked on a dairy farm for about 10 years and we had the odd freemartin sneak through into the replacement heifers. You don't find out until the artificial insemination technician tries to inseminate her and things aren't right (I can't exactly remember what they find in there. Might have been no cervix?) Wastes a lot of time and money raising a useless cow.

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hammyhamm t1_j6mb401 wrote

Why doesn’t this happen with fraternal twins in humans?

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SleeplessTaxidermist t1_j6mcah3 wrote

Dairy cattle are commonly AI'd with sexed semen, yes, but I've never heard of embryo transfer in cattle. Maybe your thinking show cattle or horses? Embryo is expensive as hell. Pretty common in the horse world when you're talking high dollar stock (not Thoroughbreds irrc).

Twins come from the cow, not the bull, live or AI it's up to how many eggs are released during ovulation or if the egg splits. This can happen due to genetic predisposition, hormones, or pure luck.

Some farms also use a cleanup bull to catch any cows that didn't take. AI is also becoming vastly more common for beef cattle, smaller farms especially. Bulls are big, expensive, and dangerous. Way easier, cheaper, and safer, to AI the herd and rent a cleanup bull for a couple weeks to catch the missed cows.

If you're on Facebook it'd recommend the Cow Talk group. You'll see plenty of natural twins from live and AI in both dairy and beef cattle.

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RichardSaunders t1_j6mgigz wrote

for deer as a species, there's the word deer, regardless of whether it's a buck or a doe. is there an equivalent term for a single bos taurus? my great uncle called them "bossies" (bah-sees), but i reckon he just made that up based on the latin.

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20Characters_orless t1_j6mjbz9 wrote

Growing in up we would occasionally have what we called Bullers, steers that the other steers would ride constantly. We had to separate them from the rest of the herd early on, or they would be rode to death.

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Nazamroth t1_j6mleac wrote

Listen, it happens to all of us. You wake up in the morning, drink your cocoa, get the urge to commit crimes against humanity and abduct several hundred people to carry out your experiments, then you sit down and log in to work.

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sionnach t1_j6mnp3g wrote

If only that were always true. Twin to Twin Transfusion Syndrome and Twin Anamea Polychthaemia Sequence are pretty horrible things that happen not infrequently in monochorionic (identical) twins.

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DeterminedThrowaway t1_j6mnwdd wrote

I honestly didn't expect a reply like this, thank you. I will admit I'm a little oversensitive about people saying they wish they were intersex, because it happens more than you'd think and they don't understand the reality of it. On my end, I'll say that I understand why it might be appealing to someone on a surface level and I'll try to word it a little better next time

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inverteboi t1_j6mo83l wrote

Please don't worry about being oversensitive, you were absolutely correct to put me in my place about it. I'm a non binary person with some dysphoria in that area but that gives me no right to downplay others' pain. Thank you for your reply, I'll make sure to educate myself much better on this for the future ❤

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DeterminedThrowaway t1_j6mp83i wrote

I'm a trans-masc enby and one of the reasons it's so frustrating to me is that not only did my intersex condition rob me of how I would have preferred to be born (I have XY chromosomes but don't get to be male which is endlessly grating to me), it also made it impossible for me to really do anything about it since I'm insensitive to T and was surgically altered as an infant already. I know it's a lot to put out there but it's just some context about how intersex conditions can be incredibly counterproductive rather than validating. I don't get any comfort from this, just health issues unfortunately

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pheasant692 t1_j6mqppk wrote

Does this apply to human twins also. Just curious.

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inverteboi t1_j6mrld8 wrote

I'm really sorry to hear all this, honestly it sounds awful and I'm sorry it's something that you have to deal with :( thank you for trusting me with this information even after how rude I was, I know it must be so exhausting to have to explain to people so much- I know its exhausting being non binary even without the extra hardship. Thank you for this.

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tjjwaddo t1_j6mt312 wrote

That's absolutely fascinating. Thank you.

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Smarty_40 t1_j6n6rnk wrote

I have to say, I did not know this about cows. Fun fact learned today 👍

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nanochipdata t1_j6n99bz wrote

In vet school they taught us that they’re extremely useful to put in a herd of heifers or other females because the free martin will mount them during times of estrus. Being able to detect this 24 window of fertility is important for farmers to use AI at the right time and successfully impregnate the heifers etc.

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pdieten t1_j6nccuq wrote

Yeah, a regulation was enacted where I lived, and probably where you lived too, that notices had to be put up if a bull lived on the property even if all he did was stand there and chew his cud at you. Must have been sometime in the '80s, because one day when I was in my early teens Dad grabbed a big magic marker and wrote "Beware of bull" on the whitewashed doors to the barns.

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overeducatedhick t1_j6np42u wrote

We always called these "freemartin" heifers. We just never tried to keep them as replacement heifers for the herd.

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rodeopete3281 t1_j6nq59z wrote

It's called a Freemartin. They're great to raise, cornfed for a year or so and then have processed.

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meowroarhiss t1_j6nxzvu wrote

Wtf?! Why doesn’t the world discuss this more? Why is it specific to cowboys? Does it happen to any other profession? What about farmers?

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Diplodocus114 t1_j6nykq9 wrote

Enter at your own risk etc. I was a kid in farming country in the 70s (born 63) and never saw a sign until the 1990s. Bulls were fine - they never left their girls unless approached - it was the curious bullocks that chased you.

Even now I would check out the undersides of young cattle before entering a field of strangers.

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Infinite_Mango4 t1_j6o7349 wrote

That's crazy I was just reading Brave New World 5 mins ago

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SleeplessTaxidermist t1_j6ork15 wrote

I had no idea that was a thing there! Embryo transfer is like....never mentioned among US cattle farmers.

Honestly there is a lot about UK husbandry practices I really admire. I watch a cattle farrier who trims whole dairy herds and treats various diseases of the hoof. Here, Farmer Joe just sells the cow with poorly feet and gets a cow with better feet.

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405134 t1_j6oufl5 wrote

Wow , that’s gotta be pretty rare though right? And I’m sure situations where twins are conjoined in the womb also potentially could share blood; like conjoined twins

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