[Electronic indicators for determining the optimum moment for inseminating cows and sheep]

Three types of electron indicators to measure the electric resistance of the vagina with cows and ewes are described. The first type of such indicators gives a direct scale record of resistance as measured in ohm units. The remaining two types present a simpler construction, and are intended for practical purposes, pointing to the threshold value of resistance. It has been found by means of these indicators that the optimal time for insemination in the case of cows is when the electric resistance is lower than 250 omega; for ewes--when the resistance is lower than 550 omega. The indicators rate totally designed with Bulgarian transistors and integral schemes.