is the Swiss Webster or CFW strain. They are a pure white mouse of smaller body size, and I have never seen a pure CFW with color. CFW's in my opinion are not as hardy as some other strains. Outbreed Swiss Websters will produce litters of 18 to 20 routinely, however the heavily inbred CFW's will have slightly smaller litter sizes. The only drawback with this strain with regards to production is the shorter peak litter size period with these females than with most other strains, and a shorter breeding life. I have outcrossed these CFW mice with a good outbred CF1 colored strain and this makes up the majority of my colony. These cross-strain mice are larger and more robust, and never have any health issues. They produce litters of 12 to 15 for 8 to 9 months with no problem. The older adults are in the 50 to 60 gram range. I believe this CF1 - CFW outcross strain are the best mice I have ever worked with.

Kelly

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