Experience in the control of nematodirosis of calves on the Ivanovo Region farms and the economic justification of anthelmintics

Abstract

The purpose of the research is to evaluate the anthelmintic efficacy against gastrointestinal Strongylata infections of cattle and to give an economic justification for their use in Yaroslavl calves.Materials and methods. The studies were performed on the Ivanovo Region farms in 2018–2020. To determine the helminth infection in cattle, 604 animals undergone a coprological survey. The faeces were examined by the Fülleborn and Berman- Orlov methods. To determine the therapeutic efficacy of anthelmintics, 4 groups of animals spontaneously infected with Nematodirus sp. were formed. The first group of calves was dewormed with a drug containing 20% albendazole. The second group of animals received a drug containing eprinomectin, and the third, a combined anthelmintic containing praziquantel and ivermectin. The fourth group of calves was dewormed with an ivermectin containing drug. Results and discussion. On the Ivanovo Region farms, nematodirosis was recorded in the calves aged 6–12 months; the infection prevalence was 75.3% with an average intensity of 31.04±0.77 egg specimens in 1 g of faeces. The diets for calves on all of the farms were approximately the same; the average daily weight gain of the calves was 251.10±0.54 g. Drugs with the active substance of 20 % albendazole, eprinomectin, praziquantel + ivermectin, and ivermectin showed 100% extenseeffectiveness and intense-effectiveness. The release of the calves from Nematodirus spp. allowed to increase the average daily gain in the body weight of the Yaroslavl calves to 650±0.40 g. The applied anthelmintics showed an economic efficacy of RUB 12.7-13.1 for RUB 1 of costs.