Agricultural History Series  Missouri State University  1904 St. Louis Worlds Fair Agricultural Events 30 Day Milk Test The thirty day dairy test was a test performed on the cows, as well as milk.  The test ran from June 15 to July 15.  The following table presents the results of the test for all breeds. The Holsteins had the largest amount of butterfat produced per cow per day, as well as the most total solids produced, which is very unusual due to the fact that modern-day Holsteins are known for the greatest number of pounds produced and Jerseys are known for having the highest butterfat percent.     Breed Total # Food Consumed Total # Milk Produced # Milk Per Cow Per Day Total # Fat Produced Total # Fat Per Cow Per Day Total # Solids Produced # Solids Per Cow Per Day 25 Jerseys 36,919.3 33,336.9 44.4 1,449.3 1.93 2,831.6 3.74 15 Holsteins 43,947.1 25,604.6 56.9 882.1 1.96 1,962.3 4.36 5 Brown Swiss 13,766.9 7,285.7 50.1 239.4 1.50 624.3 4.16 29 Shorthorns 35,700.0 31,671.5 36.4 1,082.1 1.24 2,617.5 3.00 Jerseys were the most economical at producing a pound of  butterfat, at 11.3 cents per pound.  Holsteins were second at 13.2 cents, followed by Shorthorns at 16.3 cents, and Brown Swiss at 16.7 cents. Reference: Farmer and Stockman, August 25, 1904. This page is designed by Patrick Burkemper and Larry Gregory and is maintained by Lyndon Irwin.  Go back