Posted by:
FRoberts
at Thu Oct 2 14:01:38 2008 [ Email Message ] [ Show All Posts by FRoberts ]
As far as I know the sex of the neonates is determined genetically by the female, but it would not surprise me if Temperature Dependent Sex Determination existed in snakes.
My opinion would be that any snake that can produce a viable outcome in a broad range of temps may utilize TSD. But lets say the Reticulated and or Burmese Python that has the ability to keep their eggs within a narrow range ( outside this narrow range egg death occurs) probably would not utilize TSD. Then we have the Ball Python, their eggs can hatch with quite a variable temp range, so maybe they may or can use TSD.
As far as I know and have read paternity is a genetic trait in all snakes and some chromosomes have been discovered/ identified to validate this. But I do not believe in a concrete form of science. There is a lot we don't know.
I believe BRB's are a species that could fall into the possible range according to viable outcomes at varying temps to perhaps utilize TSD.
Some reptiles (lizards) I believe can utilize both genetic and TSD within the species. So anything is possible.
But before anything is fertilized I find it highly unlikely that the cooling period plays a role in paternity, but it may.
Who knows ???????????
>>I find it hard to believe the duration of the cooling period has any effect on the paternity of the young. The amount of viable ova produced perhaps. No one knows how much cycling is needed or if any is needed.
>>
>>A certain amount of cycling will be produced even without trying so even if you don't cycle, maybe you did enough to get a viable outcome.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>>>Had a 10.5 this year but IMO that's within normal statistical variability. Overall with 162 babies born (157 sexed) I'm at 74.83 or 47% male. Pretty close to even.
>>>>
>>>>Last year with a cooler gestational cycle, I had longer gestational periods but had a heavier female outcome. 101 total babies 41.60 or 41% male.
>>>>
>>>>I run my cooling cycle about 2 1/2 months.
>>>>-----
>>>>Thanks,
>>>>
>>>>
>>>>Dave Colling
>>>>
>>>>www.rainbows-r-us-reptiles.com
>>>>
>>>>
>>>>
>>>>0.1 Wife (WC and still very fiesty)
>>>>0.2 kids (CBB, a big part of our selective breeding program)
>>>>
>>>>LOL, to many snakes to list, last count:
>>>>26.49 BRB
>>>>20.21 BCI
>>>>And those are only the breeders
>>>>
>>>>lots.lots.lots feeder mice and rats
>>
>>
>>-----
>>=========================================================
>> Roberts Realm Of Reptile Research
>>=========================================================
>>Thanks,
>>
>>Frank Roberts
>>
>>
>>
>>I opened my mouth and out flowed a melody black.
-----
=========================================================
Roberts Realm Of Reptile Research
=========================================================
Thanks,
Frank Roberts
I opened my mouth and out flowed a melody black.
[ Hide Replies ]
|
RE: I find it hard to believe the duration . - FRoberts, Thu Oct 2 14:01:38 2008