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.
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.
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