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Effect of Pasture upon the Carotene Content of Blood Plasma of the Bovine

Michigan Agricultural Experiment Station, East Lansing, Michigan

ABSTRACT

1. Different breeds kept under similar conditions of feeding ranked in increasing order of plasma carotene values as follows: Brown Swiss, Holstein, Ayrshire, Jersey and Guernsey. There was little difference between the first three.
   
2. Within the breed there was little difference in the level of plasma carotene values among cows producing milk under winter conditions.
   
3. Heifers within the breed had definitely lower plasma carotene values than producing cows under both winter and pasture conditions.
   
4. Cows producing the larger amount of milk within the breed in general showed a greater increase in the level of plasma carotene when they were turned to pasture.
   
5. One cow with a very low initial plasma carotene value showed an increase within 15 hours after being fed freshly cut alfalfa.
   

The author wishes to express his appreciation to Dr. C. A. Hoppert of the Chemistry Department for his assistance in preparing this paper.