Further Evaluation of Butoxypolypropylene Glycol as a Fly Repellent for Dairy Cattle1

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Abstract
In computing % repellency of test sprays containing butoxypolypropylene glycol 800 alone and with pyrethrins, allethrin or Thanite, a method was devised which took into consideration possible fluctuations in the susceptibility of dairy cattle to horn, stable or house flies during the testing period. 5-10% butoxypolypropylene glycol 800 was highly effective on the day of application but generally dropped off on the following day. The base oil used in formulation can be selected to cause least interference in evaluation of a series of repellent ingredients or to provide maximum repellency. Although emulsions appeared as effective as oil base spray, the addition of bentonite S as a sticking agent did not improve repellency.

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