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R Supperer

Publications and source records attributed to R Supperer.

At least 19 recordsLinked to original sources
PubMed1983

Morantel sustained release bolus: a new approach for the control of trichostrongylosis in Austrian cattle.

The efficacy of a morantel sustained release bolus to control gastrointestinal parasitism during two consecutive grazing seasons was assessed in replacement dairy heifers raised under field conditions in Austria. Thirty calves were randomly allotted into two equal groups and maintained throughout the 1979 summer pasturing season on adjacent pastures of equal size with identical grazing history. Twenty-four of the thirty calves used in 1979 were monitored throughout 1980, each animal remained in the same treatment group as the previous year and grazed the same pastures as the previous year. In both 1979 and 1980 the bolus was administered to each animal in the treated group one week before turnout onto spring pastures, while the control animals received no anthelmintic treatment during either year. The efficacy of the bolus was assessed by comparison of faecal worm egg counts, herbage larval counts, worm counts from tracer and principal trial animals, weight gains and by the incidence of clinical disease found in both tracer and trial animals throughout the grazing season. Milk production was also monitored for all animals in both treatment groups during the first lactation. The system of treatment used in the present study with the morantel sustained release bolus was highly effective in preventing a significant buildup of infective larvae on pasture to the end of the grazing season in both years. In 1979 worm counts of tracer calves grazed on the treated pastures in mid-August were similar to those recorded at the beginning of the season, while worm counts in the control tracers were five times the total found at the beginning of the season. In 1979 the bolus-treated calves outperformed the control group by 34.8 kg (P less than 0.001) over the 168-day grazing period. These results demonstrated that administration of the bolus to calves at the time of turnout onto spring pastures was most effective both in controlling parasites within the cattle themselves and in reducing the level of parasite contamination. During the second grazing season (1980) no beneficial effect in weight gain was observed due to the second bolus treatment. Weight gains realized during the first year, however, largely remained through the second year and the bolus-treated heifers reached breeding weight on average 19 days earlier. No difference in milk yield was observed between the treated and control animals during thier first year of lactation.

Animals↗
PubMed1983

[Occurrence of Onchocerca lienalis (Stiles, 1892) in cattle in Austria].

The prevalence of O. lienalis in 345 Austrian cattle was determined by detection of microfilariae in the skin. Though only one among 59 male animals yielded a positive result, 46.5% of the female cattle showed to be infected with the parasite. Comparing the presence of adult worms in the gastrosplenic ligament and that of larval stages in the skin a correlation of 87.5% could be obtained. Most of the microfilariae were concentrated in the umbilical region but with severely infested animals they also were found in the skin of the udder, head, ear and neck. Seasonal periodicity of microfilariae was not observed.

Animals↗