ЭлБиб

Молочнохозяйственный вестник, №4 (24), IV кв. 2016

215

рефераты

подвержены инвазированию гельминтозами. Наименьшая инвазированность

гельминтами отмечена у животных, круглый год содержащихся в стойле на привязи.

Summary

n order to predict the helminthological situation in cattle as part of an epizootological

monitoring, to develop knowledge concerning ecological and epizootiological features

of the area studied we have carried out a research to investigate the distribution of

helminth infections depending on natural-economic zones, seasonal and age dynamics

of helminth infections, time period of helminth infection, associated invasions, the

dependence of infected animals on the breed factor and on the animals keeping

technology. For this purpose study has been conducted at dairy farms of the Vologda

region with using of standardized helminthological methodologies. We have found

that helminth infections in cattle are widely distributed on the territory of the Vologda

region. It should be noted that the structure and the density of helminths population

in the body of animals are not the same in the different climatic zones of the region.

Previously grazing animals were invades by helminths infection in all seasons. There

has been a significant difference in the structure and density of trematodes, cestodes

and nematodes population in the body of animals. Young animals of the first year of

grazing begin being infected by helminths immediately after changing from stall to

pasture keeping. It is due to the possibility of survival of worms from the last year’s

generation and their ability to infect animals. However, the main infection occurs by

larvae of the current year generation. Cattle of different age groups have been infested

by worms to varying degrees. It has been established that the associated infestation

of cattle are found in all climatic zones of the region and often they are the main form

of parasitism. The greatest infestation by helminths has been observed in animals of

black and white breed and the lowest one in the Yaroslavl breed. The animals are the

most susceptible to invasion by helminths when farms use stall-pasture technology.

The lowest infestation by helminths has been observed in animals that stay in stall on

a leash throughout the year.

Электронная Научная СельскоХозяйственная Библиотека