Heat Tolerance Comparisons between Jersey and Holstein Cows

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Abstract
Producing cows used in this study were handled as two separate dairy units at Louisiana State University. Each unit consisted of two dairy breeds and totaled in 1944 36 Holsteins and 16 Jerseys, and in 1945, 41 Holsteins and 27 Jerseys. Only 13 Holsteins and 8 Jerseys were the same cows for the two years. Observations made totaled 26 and covered a period of 13 weeks in 1944, while in 1945 only 15 observation days were used covering a much shorter period of time. Air temperature during days of observation varied in 1944 from 65 to 93° F. with an average of 85.1° F. In 1945 the range was from 75–91° F. with an average of 85.6° F. Jersey and Holstein comparisons follow: Copyright © . .