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The second part continued the biological characteization of the outbred strain Chbb : NMRI (SPF) (formerly NMRI/Tübingen/Kisslegg/Biberach) mice. The results obtained from 7 generations (F9 to F 15-generations) refer to the following parameters: loss of breeding animals, conception rate, ability to build a nest, litter size at birth and weaning, loss of young animals, litter weight at birth and weaning, intervals between two births and efficienty quota.
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