Studies on the vitamin B12 content of cows' milk. I. On the vitamin B12 content of cows' milk, produced by the dairy farmers in Kyoto Prefecture of Japan.
Kawashima, R.; Uesaka, S.; Mitsuhashi, M.
Proc. Silver Jubilee Lab. Anim. Husb., Coll. Agric., Kyoto Univ, 115-23
The vitamin B12 content of 212 milk samples (from Friesian and cross-bred cows) collected from June 1956 to Jan. 1958 was determined by microbiological assay with E. coli 215 and an average value of 0.33 micro g./100 ml. with a range from 0.10 to 1.30 micro g./100 ml. was obtained. The vitamin B12 content of cows' milk tended to be greater in April and smaller in Nov. and Dec.