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Test Breeding

Last Updated: 21st December 2023

This system is still in beta and will undergo various iterations throughout 2023 and 2024. Basically - bear with us!

Transparency is incredibly important to us at Leopard Geckos London, and in an effort to uphold this value, we have made all of our test breeding information public.


This guide is intended to be used by breeders who are aware of how these genes work, and what test breeding is. The information provided is not relevant to those who do not intend to breed their geckos.

How to use

Your gecko will have arrived with an ID code which is completely unique to them, for example, LGL-12-7. The first section 'LGL' stands for Leopard Geckos London, and signifies that the gecko was produced by us (as opposed to purchased). The second section '12' is the gecko's pairing number. Every pairing we do is given its own number so we can easily track the lineage of our animals. The third section '7' signifies that this individual was the 7th of their siblings to hatch. 


You will notice some geckos have an ID that looks more like this: 'P15 Ignis'. The 'P' stands for purchased and simply means we did not produce that individual.

In order to find what LGL-12-7's lineage has been tested for, find 12 in the ID column of the spreadsheet (column B). You can then see which genes were present in your gecko's siblings, and also who their sire and dam are. Use Ctrl-f to search for all of the pairings their parents have been used in, and what they produced. If your gecko was produced by a gecko with an LGL ID code, you can track their lineage further using this method.

Each pairing result is colour coded. Please use the following key for best results.

Test Breeding Key

We do not have any information on the test breeding done on any animals with a P ID code, as these are not animals we produced.

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