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The Effects of Environmental Temperature and Relative Humidity on the Acclimation of Cattle to the Tropics^{1, 2,}

The Pennsylvania State College

Abstract

Conclusions: The differences in the body reactions and physiological well being between cattle of the five dairy breeds studied indicate breed differences which are important from the viewpoint of acclimatization and milk production:

1. The Jersey breed is readily adaptable to Puerto Rican climate and environment. The Brown Swiss, Guernsey and Ayrshire breeds seem to follow the Jersey in adaptability in this order, as shown by their body reactions and milk production. The Holstein breed from the physiological viewpoint seems to be less adaptable than the other breeds to Puerto Rican climate and environment.
   
2. Native grades, Brahman grades and Hereford cows seem to acclimate well to Puerto Rican conditions but seem to be more sensitive to a high humidity than the dairy breeds studied.
   
3. There seems to be nothing in the Puerto Rican environment to prevent the further development of the cattle breeds, if suitable methods of feeding, management and protection against disease and parasites are employed.
   

¹ The data in this paper are taken from a thesis submitted by the senior author to the Graduate School of The Pennsylvania State College in partial fulfillment of the requirements for the Ph.D. degree.

² Authorized for publication on March 1, 1951 as paper number 1661 in the Journal series of the Pennsylvania Agricultural Experiment Station.

³ Address: Animal Husbandry Division, Agricultural Extension Service, University of Puerto Rico, Rio Piedras, P. R.

⁴ Departments of Animal Husbandry and Agricultural and Biological Chemistry respectively.