Author Topic: Twin calves (Read 9078 times)

langfauld easycare · « **Reply #15 on:** August 13, 2015, 07:39:58 pm »

the guy who does most of the ai and cattle breeding stuff about here rekond when the heifer could breed she was usualy one of triplets but the cow would have slipped one or reabsorbed etc . said the twins usualy came from the same egg which split but the triplets were separate eggs . not sure but made sense

SallyintNorth · « **Reply #16 on:** August 13, 2015, 07:51:14 pm »

Twins of different genders cannot possibly be from the same egg.

harmony · « **Reply #17 on:** August 13, 2015, 10:19:32 pm »

It is very rare in humans but it is possible to have twins of different genders from one egg. Something to do with an extra chromosome[/size] I think.

Backinwellies · « **Reply #18 on:** August 14, 2015, 07:22:20 am »

Can't see how that could possibly be the case ........... reference please

harmony · « **Reply #19 on:** August 14, 2015, 09:46:55 am »

Sorry missed off a word...chromosome

There can be monozygotic boy/girl twins if the sex gene of theembryo has an extra x chromosome (the fertilized egg would be an xxy) then when the egg splits, one can have xx (girl) genes and one can have xy (boy) genes. This is rare, but possible.

Twin - Wikipedia, the free encyclopedia[/size]https://en.wikipedia.org/wiki/Twin[/size][/font]

SallyintNorth · « **Reply #20 on:** August 14, 2015, 10:29:49 am »

That Wiki article goes on to say

Quote

This is rare, but possible. Records show there are only 10 known cases of these type twins. The probability of this is so small that multiples having different sexes is universally accepted as a sound basis for in utero clinical determination that the multiples are not monozygotic.

So I'll stand by my statement !

Quote from: SallyintNorth on August 13, 2015, 07:51:14 pm

Twins of different genders cannot possibly be from the same egg.

The section in Wiki is about unusual twinnings in humans, there's no information as to whether it is known to ever happen in other mammals.

waterbuffalofarmer · « **Reply #21 on:** August 14, 2015, 02:09:49 pm »

Why is it when scientists explain stuff they use long words which are a struggle to pronounce?

roddycm · « **Reply #22 on:** August 14, 2015, 03:44:27 pm »

Only about 10% of these male female twins are fertile according to studies. Weird that the same doesn't happen in humans and other mammals, no?

harmony · « **Reply #23 on:** August 14, 2015, 04:06:36 pm »

I said humans and rare. The female "twin" would have no ovarian development, "Turners Syndrome".

Blondie · « **Reply #24 on:** August 15, 2015, 10:45:13 am »

Turner syndrome is XO - the person only has a single X chromosome and so although appears female they have certain features which are common among sufferers. They are usually infertile however I know one woman who did go on to have a child despite having Turners.

I don't think you would / could get Turner from being a twin. It's more likely that it's due to the male gamete missing the X.

landroverroy · « **Reply #25 on:** August 15, 2015, 09:18:39 pm »

But in spite of all these technicalities, no matter whether the twins have come from one egg or two, and regardless of how many X or Y chromosomes are present or missing, are we not still agreed that a heifer calf twinned with a bull calf, is more likely than not to be sterile?