Jackson Ratio

JACKSON RATIO

Jackson Ratio

The 'Jackson Ratio' graph may only be used with tortoises of 'average' body morphology,e.g. Testudo graeca and Testudo hermanni. This graph MUST NOT be used with Testudohorsfieldii or Testudo marginata, as it will invariably produce incorrect results. The body shape of these species is such that T. horsfieldii, being 'short and square' will tend to read 'overweight' even if it is actually underweight. T. marginata, being 'long and narrow' will, on the other hand, read 'underweight' even if it is of a perfectly average and safe weight for its size.

This graph must ONLY be applied to Testudo graeca and Testudo hermanni and to no other species of tortoise. When measuring your tortoise for the Jackson Ratio graph, use the straight line carapace method, (the underneath) and do not measure 'over the curve' (top of shell).

If you want to copy any information on these pages please contact

contact@hermann-tortoise.co.uk