Experiments with defined multispecific coccidial infections in lambs

Catchpole, J.; Norton, C. C.; Joyner, L. P.

doi:10.1017/s0031182000048447

Cited by 50 publications

(29 citation statements)

References 17 publications

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“…The Eimeria species regarded as pathogenic in sheep are E. ovinoidalis (Catchpole et aL, 1976;Gregory et aL, 1989;Gregory, 1990), E. crandallis (Catchpole and Gregory, 1985;Gregory, 1990) and E. ahsata (Gregory, 1990). Most of the other species are of relatively low pathogenicity.…”

Section: Discussionmentioning

confidence: 99%

The prevalence and intensity of infection withEimeria species in sheep in Nyandarua district of Kenya

Maingi

Munyua

1994

Vet Res Commun

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The prevalence and numbers of coccidian oocysts in faecal samples from young (less than 6 months old), immature (6-12 months old) and adult (over 12 months old) sheep on 15 farms in Nyandarua district were studied during the dry and wet seasons. The species of Eimeria occurring in these sheep were also identified. The proportion of animals shedding coccidian oocysts did not vary significantly with season. The prevalence of the oocysts was significantly higher (p < 0.05) in young sheep (mean 85.3%) compared to immature (mean 40.2%) and adult sheep (mean 32.15%). OPG counts (oocysts per gram of faeces) were significantly higher (p < 0.01) in the young sheep compared to immature and adult sheep during both seasons. Prevalence and OPG did not differ between immature and adult sheep. There was no significant difference in OPG during the wet season (mean 328 +/- 997) compared to the dry season (mean 219 +/- 773). The sex of the sheep had no significant effect on prevalence or OPG. Eight species of Eimeria were recognized. They (and their prevalence) were E. bakuensis (ovina) (43.6%), E. ovinoidalis (23.6%), E. ahsata (15.2%), E. intricata (8.27%), E. granulosa (4.8%), E. faurei (2.8%), E. parva (1.06%) and E. pallida (0.67%).

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Section: Discussionmentioning

confidence: 99%

The prevalence and intensity of infection withEimeria species in sheep in Nyandarua district of Kenya

Maingi

Munyua

1994

Vet Res Commun

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“…That is, infection with one species enhances proliferation of another species. For instance, Catchpole et al (1976) found that pure inoculations of 4 species of Eimeria in lambs produced shorter patent infections than when all 4 species were administered at once. The immunogenicity of the different parasite species and the extent to which hosts develop cross-immunity will play a role in this phenomenon.…”

Section: Associations Between Protozoan Speciesmentioning

confidence: 99%

Epidemiology of parasitic protozoan infections in Soay sheep (Ovis ariesL.) on St Kilda

et al. 2006

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The feral Soay sheep (Ovis aries L.) population on Hirta, St Kilda, is host to a diverse component parasite community, but previous parasitological studies of the population have only focussed on the metazoan species. This paper reports the first epidemiological study of the protozoan species comprising Cryptosporidium parvum, Giardia duodenalis and 11 species of Eimeria in Soay sheep across 3 years of varying host population density. Prevalence and intensity of almost all species of protozoa significantly decreased with host age, with the exception of E. granulosa, which increased in prevalence with host age. The prevalence of C. parvum appeared to vary positively with host population density but that of G. duodenalis did not vary significantly with density. Most species of Eimeria showed a distinct lag in infection level following the host population crash of 2002, taking up to 2 years to decrease. Mixed Eimeria species intensity and diversity were highest in 2002, a year of low host density. Parasite diversity decreased with host age and was higher in males. There were 5 positive pair-wise associations between protozoa species in terms of prevalence. The results of this study highlight the potential for protozoal infection to shape the evolution of parasite resistance in wild host populations harbouring diverse parasite species.

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“…Saratsis et al (2011) reported that E. parva is not related to acute cases of diarrhea in naturally acquired infections, but had reported that this species decreased the body weight gain of infected animals (BERRIATUA et al, 1994). Eimeria ovinoidalis is considered the most pathogenic, and accounts for the majority of clinical cases of the disease (CATCHPOLE et al, 1976;CHARTIER & PARAUD, 2012). E. ovinoidalis and E. crandallis have a high multiplicity in relation to the others and are thus frequently observed in sheep (CATCHPOLE et al, 1976) and a high parasitic load of pathogenic species causes a reduction in weight gain (CHARTIER & PARAUD, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Eimeria ovinoidalis is considered the most pathogenic, and accounts for the majority of clinical cases of the disease (CATCHPOLE et al, 1976;CHARTIER & PARAUD, 2012). E. ovinoidalis and E. crandallis have a high multiplicity in relation to the others and are thus frequently observed in sheep (CATCHPOLE et al, 1976) and a high parasitic load of pathogenic species causes a reduction in weight gain (CHARTIER & PARAUD, 2012).…”

Section: Discussionmentioning

confidence: 99%

Efficacy of treatments with toltrazuril 7.5% and lasalocid sodium in sheep naturally infected with Eimeria spp.

Rodrigues

Tavares

Paiva

2016

Rev. Bras. Parasitol. Vet.

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The objective of this study was to evaluate the efficacy of an experimental formulation of toltrazuril 7.5% + Trimix™ on a naturally acquired infection of Eimeria spp. in suckling lambs kept on pasture and, in another trial, evaluate the comparative efficacy between lasalocid and toltrazuril 7.5% + Trimix™ in newly weaned sheep under feedlot conditions that had been naturally infected with Eimeria spp. In the first experiment, 30 suckling lambs were divided into two groups: A - treated with toltrazuril 7.5% + Trimix™ and B- control. In experiment 2, 30 weaned sheep were divided into three groups: I - treated with toltrazuril 7.5% + Trimix™, II - treated with lasalocid and III - control. Treatment group A showed an efficacy of 90, 99.4 and 87.3% on days 5, 10 and 20, respectively. Treatment group I had an efficacy of 98.2, 92.6 and 94.5%, while group II had an efficacy of 72.7, 81.6 and 95.9% on days 7, 21 and 42, respectively. Eight Eimeria species were identified; E. ovinoidalis was the most common. Treatment with the toltrazuril 7.5% +Trimix ™ formulation was effective against Eimeria spp. in suckling lambs in field conditions and lambs weaned in under feedlot conditions.

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Experiments with defined multispecific coccidial infections in lambs

Cited by 50 publications

References 17 publications

The prevalence and intensity of infection withEimeria species in sheep in Nyandarua district of Kenya

The prevalence and intensity of infection withEimeria species in sheep in Nyandarua district of Kenya

Epidemiology of parasitic protozoan infections in Soay sheep (Ovis ariesL.) on St Kilda

Efficacy of treatments with toltrazuril 7.5% and lasalocid sodium in sheep naturally infected with Eimeria spp.

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