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The Relative Importance of High Temperature and High Humidity as Factors Influencing Respiration Rate, Body Temperature, and Pulse Rate of Dairy Cows

Dairy Research Department, Louisiana Agricultural Experiment Station

ABSTRACT

Observations made of 36 Holstein and 16 Jersey milking cows during the summer of 1944 and of 41 Holsteins and 27 Jerseys in 1945 revealed the following:

1. Changes in air temperature appeared to be the major cause of increases in body temperature and respiration rate of milking cows.
   
2. Multiple regression equations indicate that one degree increase in air temperature was responsible for from 13 to 15 times as much increase in body temperature as was an increase of one per cent in humidity.
   
3. Likewise, one degree change in air temperature caused from 41 to 43 times as much influence on respiration rate as did one per cent change in humidity. On a partial correlation basis (air temperature held constant) an increase in humidity slightly lowered respiration rate. The r values were –0.06 and –0.02.
   
4. Partial correlations between air temperature and body temperature (humidity held constant) were 0.674 and 0.534.
   
5. Pulse rates were less affected by either air temperature or relative humidity than was body temperature. Air temperature and pulse rate measured independently of humidity gave r values of 0.195 and 0.159. Humidity and pulse rate (with air temperature constant) gave a value of –0.05 for one year and 0.07 for the other, thus leaving a question as to its real relationship.
   

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