Effects of single or concurrent infections with Eimeria alabamensis and gastrointestinal nematodes on the performance of calves on pasture

Abstract

Twenty-four calves unexposed to pasture were allocated to four groups and inoculated with either two doses of 5 million Eimeria alabamensis oocysts at turn-out (E), 90,000 L3 of Ostertagia ostertagi and Cooperia oncophora divided on six occasions (N) or both oocysts and larvae as above (E + N). A control group was left uninoculated (C). For 10 weeks, the groups grazed in separate uniform paddocks not previously grazed by cattle. By day 5, most calves in groups E and E + N developed clinical coccidiosis that resulted in reduced weight gain compared to C and N. Mean trichostrongylid faecal egg counts in groups N and E + N never exceeded 300 eggs per gram of faeces, and average serum pepsinogen levels were less than 3.8 U tyrosine. This experiment demonstrates the potential impact of E. alabamensis on the performance of previously unexposed calves, whereas no aggravated effects were observed due to concurrent infections with gastrointestinal nematodes.

Prevalence and risk factors of coccidiosis in calves from Veracruz, México

“…The presence of E. canadensis does not cause significant damage to the intestine of the infected animals, since this species is not considered pathogenic within the pathogenicity classification (Bangoura & Bardsley, 2020), however, their high frequency in this study deserves future epidemiological and clinical studies throughout the year. It is mentioned that economical losses due to subclinical disease even are higher than clinical coccidiosis (Fitzgerald, 1980) because it is more common and can affect the productive and reproductive parameters in cattle (Larsson et al, 2006).…”

The influence of desiccation and UV radiation on the development and survival of free-living stages of cyathostomins under field and laboratory conditions

“…published recently, however, only studying the free-living stages of trichostrongyles of ruminants (Stromberg, 1997;Fernández et al, 2001;Larsson et al, 2006). The aim of this project is to extend the previous studies and findings of many authors (Baruš, 1963;Rupasinghe & Ogbourne, 1978;Hasslinger, 1981;Mfitilodze & Hutchinson, 1987), to improve the general knowledge concerning these significant strongyles and helping to control them.…”