Internal parasites of horses on mixed grassveld and bushveld in Transvaal, Republic of South Africa.

The research focuses on the study of internal parasites found in horses, specifically in the Transvaal region of South Africa on mixed-grassland and bushveld between the years 1980 and 1982. Detailed analysis and distribution of various parasite species were carried out stemming from 17 horses.

Parasite Identification and Prevalence

• The study found a high prevalence of a variety of parasites in the equine gastrointestinal tracts. The analysis at necropsy allowed for detailed identification and prevalence rates of these parasites.
• The most common parasites identified are large strongyles. Among these, Strongylus vulgaris had the highest prevalence, present in 88-94% of the examined horses.
• Other large strongyle species, including Strongylus edentatus, Strongylus equinus, and Craterostomum acuticaudatum, showed lower but still notable prevalence rates of 24%, 30%, and 18% respectively.

Cyathostome Prevalence and Seasonality

• Furthermore, seven species of cyathostomes, a type of small strongyle, were able to adapt and survive in the horses’ intestine.
• These parasites included Cylicostephanus longibursatus, Cylicostephanus goldi, Cylicostephanus calicatus, Cylicocyclus nassatus, Cyathostomum catinatum, Cylicostephanus minutus, and Cyathostomum coronatum.
• Interestingly, this study found the highest prevalence of these parasites during all seasons except winter, suggesting a possible decrease in parasitic activity during cooler weather.

Notable Presence of Botfly Larvae

• Additionally, Gasterophilus intestinalis, a type of botfly larva, was identified as the most prevalent and abundant parasite during the course of the study.
• This discovery highlights the need for effective preventive measures due to the potential disruptive effects such infestations can have on a horse’s health.

Implications of the Study

• The researchers thoroughly discussed the distribution of the cyathostome species in the large intestine of the host, suggesting potential correlations or patterns which may influence future preventive or treatment measures.
• This research provides valuable insights into the variety of equine internal parasites in the Transvaal region and can form the basis for targeted prevention and treatment strategies for horse populations in this area.