Ovicidal effect of disinvasive substances on the eggs of nematodiroses causative agents

The article deals with the study of the disinvasive effects of various percentage solutions of chemical substances on the eggs of nematodes in cattle under in vitro conditions. Based on the results obtained during the experiments, carried out under in vitro conditions it was found that 3.0% and 5.0% solutions of the deltatrine preparation destroy nematode eggs by 100%, and 3.0% and 5.0% solutions of the citrine preparation by 72.2-80.0%. In a concrete test object, with a 3-hour exposure, helminth eggs (1200 eggs) were destroyed by 100% from the impact of a 3.0% deltathrine preparation, by 63.6% from the impact of a 3.0% citrine solution (800 eggs), and by 58.3% from the impact of 4.0% phenol (700 eggs). Also on a wooden test object, with a 3-hour exposure, helminth eggs (1200 eggs) were destroyed by 100% from the impact of 3.0% deltathrine preparation, by 58.3% from the impact of a 3.0% citrine (700 eggs), and by 63.6% from the impact of 4.0% phenol solutions (600 eggs). For control purposes, ordinary water was added to the helminth eggs, and no decrease in their number was detected. At the next stage, having isolated them from other areas, 4 plots of 1 m2 each were allocated. For the purpose of the experiment, 93.3% of eggs died on a plot sprayed with a 3.0% solution of the deltatrine preparation, 66.7% of eggs died on a plot sprayed with a 3.0% solution of the citrine preparation, and 60.0% of eggs died on a plot sprayed with a 4.0% solution of phenol. Since under in vitro conditions, due to the direct effect of disinvasive substances on Nematodirus eggs, the eggs die quickly, however, in test objects, due to the fact that the eggs are mixed with feces on an area of 1 m2, the duration of action of chemicals increases, and the percentage of destruction of helminth eggs decreases.