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The Influence of Breed, Feed, and Processing on the Riboflavin Content of Milk^*

Departments of Dairy Husbandry and Agricultural Chemistry, Idaho Agricultural Experiment Station, Moscow, Idaho

ABSTRACT

Experiments with two Holstein-Priesian and two Jersey cows over a normal lactation period of approximately 10 months (samples taken twice weekly) showed:

1. The milk of two Holstein cows used in this experiment contained, on 'an average, approximately 34 per cent less riboflavin than that of two Jersey cows.
   
2. The Holstein cows, because of higher milk production, produced on an average approximately 34 per cent more riboflavin per day than the Jersey cows.
   
3. There was an inverse relation between milk yield per day and the riboflavin content.
   
4. The riboflavin content of morning, noon, and night milk from the same cow was practically constant although the milk yields varied widely.
   
5. Supplementing a concentrate-dry roughage ration with substantial amounts of sunflower silage increased the riboflavin content of milk 36 per cent (within 2 days), and the riboflavin content level was comparatively high for the remaining portion of lactation while the silage was fed.
   
6. Supplementing a concentrate-dry roughage sunflower-silage ration with wheat pasture or sweet clover and wheat pasture caused no significant change in the riboflavin content of milk.
   
7. Stage of lactation, season, pregnancy, and oestrus have no discernible influence on the riboflavin content of milk.
   
8. Colostrum milk contains about three times as much riboflavin as normal milk but loses approximately 30 per cent of its riboflavin concentration within 24 hours after parturition of the cow.
   
9. Neither pasteurization, homogenization, or storage for 24 hours at 40° F. in a dark refrigerator decreased the riboflavin content of milk.
   

^* Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 233.