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The Ohio Journal of Science [Vol. XVII, No. 5, 



difference, are questions that arise in this connection. Many 

 of the reports read as follows: "All cattle infested save those 

 kept in the barn;" or, "all young cattle and dry cows turned 

 out to pasture during spring and summer." It is a' general 

 practice to turn young dairy stock out in the spring and leave 

 them out all summer. 



The following is a list of animals upon which notes were 

 taken, giving the number of w^arbles appearing on each animal 



and the age of the animal: 



TABLE III. 



With the exception of two, Nos. 5* and 1*, all the animals 

 belong to one herd. If those animals 2 years old and under are 

 considered young stock, and those over 2 years, old stock, 

 then the reader will note that there is very little difference in 

 warble infestation. However, if the animals in the one herd 

 only are considered, then the infestation is slightly heavier 

 in the young animals. 



Date of Publication, March 10, 1917. 



