Prenatal growth of Norwegian lemming Lemmus lemmus (L.)
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Abstract
In a study of prenatal growth males and females from a laboratory breeding stock were paired until copulation and females were sacrificed in groups 5, 10, 15 and 20 days after conception. Altogether 33 pregnant females carrying 146 embryos were used. Mean litter size was 4.42. Length and weight measurements of embryo were used as criteria of age development of embryos and thereby giving a key to determination of the stage of pregnancy during field study autopsies. This key makes it possible to give a fairly accurate determination of age of embryos according to the crown-rump length, as early as 5 days after conception and by weight between 5 and 10 days.
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