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PAPER SELECTED

The Efficacy of the Repellents Diethyltoluamide and Fenylpropandiol Applied to Grazing 1St-Calvers

RIHA J, MINAR J, VLCEK A, BARTONKOVA D
Veterinarni Medicina 36, 1991, 65-69

In practical farming conditions of an agricultural enterprise situated in South-East Moravia, the repellents N,N'-diethyl-m-toluamide and 2-fenyl propandiol 1,3 were tested after their application to grazing first-calvers of the Bohemian Pied breed. The experiment was conducted in July and August 1986 and it took 40 days. In the first experimental group, 2-fenyl propandiol 1,3 was applied and in the other group a 1:1 mixture of the repellents N,N'-diethyl-m-toluamide and 2-fenyl propandiol 1,3 in form of a 10% water emulsion in the interval of 48 hours. No flights and bites of annoying insects (gad-flies, black-flies, gnats, midges, symbovine flies) were observed in treated first-calvers in the two experimental groups. The economic efficiency of 2-fenyl propandiol 1,3 application in the first experimental group was manifested by the higher milk yield by 1.20 % and by the higher milk fat yield by 0.13 %


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