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! Polar Bear (Greenland)
! Polar Bear (Greenland)
| align = "center" | 3 || 16,300 || 18,000 ||Rohdal & Moore 1943
| align = "center" | 3 || 16,300 || 18,000 ||Rohdal & Moore 1943
|-
! Polar Bear (Greenland)
| 2 || 24,300 || 26,700 ||Rohdal 1949
|-
|-
! Polar Bear (Alaska)
! Polar Bear (Alaska)
! Greenland Seal
! Greenland Seal
| 70 || 3,441 || 15,000 || Rohdal & Davies 1949
| 70 || 3,441 || 15,000 || Rohdal & Davies 1949
|-
! Greenland Fox
| 1 || na || 12,000 || Rohdal 1949
|-
|-
! Atlantic grey Seal
! Atlantic grey Seal
! Common seal
! Common seal
| 2 || 56 || 90 || Rohdal & Davies 1949
| 2 || 56 || 90 || Rohdal & Davies 1949
|-
! Walrus
| ? || "very small" || na || Rohdal 1949
|-
! Snow hare
| ? || "very small" || na || Rohdal 1949
|-
|-
!Domestic Cat
!Domestic Cat
''NB: 1 international unit (iu) = 0.3 retinol equivalents (RE); 1 RE = 1 µg retinol = 0.0035 µmol retinol.''
''NB: 1 international unit (iu) = 0.3 retinol equivalents (RE); 1 RE = 1 µg retinol = 0.0035 µmol retinol.''
In 1949, Rodahl assessed the toxicity of polar bear liver by feeding it to rats:
<blockquote>
In experiments on rats, ingestion of 0.5-0.6 gm polar bear liver daily proved toxic in all cases. In two cases, 0.5-0.7 gm polar bear liver daily proved lethal. Variouos fractions of the polar bear liver were given to different groups of rats with the following results. Polar bear liver freed of its vitamin A was non-toxic. Bear liver, bear liver oil contraining all of its vitamin A, and purified vitamin A concentrates, had identical effects when give in equivalent amounts with regard to the vitamin A content. Equivalent amounys of bear liver oil in which the vitamin A had been destroyed had no bad effects. The symptoms increased with increasing amounts of vitamin A...It is therefore confirmed that the toxic substance in polar bear liver is identical to vitamin A, and that ingestion of large quantities of polar bear liver leads to hypervitaminosis A.
</blockquote>
'''References'''
'''References'''