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Old 07-04-2012, 07:36 PM   #11
natty
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i found this , but i have no idea if it is accurate or not , could it be used to make a spreadsheet like the one you made based on the jackson ratio ?

http://www.shellshack.co.uk/hibernating.php

There is another method of calculating whether your tortoises weight is sufficient for it to survive hibernation which some people claim is a more accurate method called the Bone Density Ratio.

The bone density can be calculated by obtaining your tortoises weight in grams and dividing it by the tortoises total straight shell length cubed. If the result falls between .20 - .25 then it is considered safe to hibernate your tortoise.

This calculation is easier than appears.

- Firstly turn your tortoise on its back and accurately measure the length of the plastron length in cm's.
- Multiply this length by its self 3 times (plastron length cubed).
- Weigh the tortoise in grams.
- Divide the weight in grams by the length.
- If the outcome is between .20 and .25 it's safe to hibernate your tortoise.
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Old 10-04-2012, 12:10 PM   #12
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Hi Natty,

That calculation weight / (SCL x SCL x SCL) is actually what I have put into the spreadsheet as this is the formula equivalent (or the closest thing) to the Jackson ratio graph.
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Old 10-04-2012, 01:28 PM   #13
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I built one for horsfields based on reworking the graph.
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Old 27-08-2012, 12:19 AM   #14
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Excellent!! just downloaded it and it works. Unfortunately shows my new little fella is slightly over weight so better get him out running about now that he has settled into his new home!!
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Old 27-08-2012, 12:24 AM   #15
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Quote:
Originally Posted by Mighty_Quinn View Post
Excellent!! just downloaded it and it works. Unfortunately shows my new little fella is slightly over weight so better get him out running about now that he has settled into his new home!!
I think it only works for tortoises over 100mm SCL. Whats the weight and SCL of yours?
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