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Milk Fat as Related to Vitamina B _{1 2} Status

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

Two experiments examined whether vitamin B_{1 2} status of liver affects milk fat percentage or yield. In Experiment 1 B_{1 2} concentration in liver, measured at approximately 8 and 15 wk postpartum in 35 cows, was not correlated significantly with milk fat percentage or yield. In Experiment 2 twenty-two cows were fed a ration similar to one used to depress milk fat percentage. The B_{1 2} status of 12 of these cows was enhanced by intramuscular injection of vitamin B_{1 2} while the other 10 served as controls. During wk 2 to 8 of lactation, milk fat percentages were almost identical for the two groups. A difference in milk fat yield in favor of the B₁₂-treated group resulted from a difference in milk yield. The data do not support a recent hypothesis of the metabolic cause of milk fat depression.