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The course and control of parasitoses in mixed grazing of sheep and cattle

CHROUST K, HORAK F, ZIZLAVSKY J, ZIZLAVSKA S
Veterinarni Medicina 43, 1998, 153-159

Studies on the occurrence of parasitoses in the course of mixed grazing of sheep and cattle were carried out in the years 1995-1997 in a herd of cows, heifers and calves of beef breed and their crosses (28 head) and a flock of ewes, yearlings and lambs of meat type breeds (50 to 70 heads). Excrements were sampled in monthly intervals from 80 to 90% of animals, after sampling, the excrements were subjected to an ovoscopic and larvoscopic analysis and to a quantitative evaluation. Results obtained in individual years demonstrated an abrupt increase in cases of infestation with gastrointestinal nematodes (GIN) and Moniezia spp. tapeworms in lambs, yearlings and ewes as early as in the first month of grazing. To suppress these infestations, dehelmintization was performed to the end of the second month of pasture and in the autumn. Ewes were treated also prior to the beginning of grazing period. In lambs, the maximum values of GIN infestations were EPG 550 in 1995 and they decreased to 180 in 1997. The corresponding findings in ewes and yearlings were EPG 200 and 90, resp. In lambs, the values of prevalence of Moniezia spp. decreased from 59% in 1995 to 25% in 1997 and in ewes and yearlings from 25% to 7% in 1997, resp. In cattle, the maximum EPG values in GIN were 75 and decreased to 30 in 1997. In the course of three years, an infestation of cattle with Moniezia spp. was observed only in 2 animals. The dehelmentization of cattle was performed only before and after the housing. Basing on a comparison of results obtained during the separate grazing of sheep and cattle it is possible to conclude that the mixed grazing decreases the intensity and prevalence of gastrointestinal helminthoses. However, a mixed pasture of sheep and cattle is rather important for a better use of grass stand and for an increase in daily weight gains


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