Lard from free-range pigs [exposed to sunlight] is also a very good source
of vit. D... second to CLO!
figures below are for 100g [approx. 3½ oz.]............ Dedy

Cod Liver Oil 10,000
Lard (Pork Fat) 2,800
Atlantic Herring (Pickled) 680
Eastern Oysters (Steamed) 642
Catfish (Steamed/Poached) 500
Skinless Sardines (Water Packed) 480
Mackerel (Canned/Drained) 450
Smoked Chinook Salmon 320
Sturgeon Roe 232
Shrimp (Canned/Drained) 172
Egg Yolk (Fresh) 148
(One yolk contains about 24 IU)
Butter 56
Lamb Liver (Braised) 20
Beef Tallow 19
Pork Liver (Braised) 12
Beef Liver (Fried) 12
Beef Tripe (Raw) 12
Beef Kidney (Simmered) 12
Chicken Livers (Simmered)
Small Clams (Steamed/Cooked Moist) 8
Blue Crab (Steamed)4
Crayfish/Crawdads (Steamed) 4
Northern Lobster (Steam 4)

http://www.ndmnutrition.com/miracle%20of%20vitamin%20d
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From: Eva Hedin

3,5 ounces of cooked salmon contains 360 IU
3,5 ounces of cooked mackarel contains 345 IU
3 ounces of canned tuna in oil contains 200 IU
3,5 ounces of cooked liver of beef contains 15 IU
one egg contains 20 IU