Gastrointestinal nematode burden in working equids from humid tropical areas of central Veracruz, Mexico, and its relationship with body condition and haematological values.

The study documents the prevalence of gastrointestinal nematodes in working equids in the central Veracruz, Mexico region, and the relationship between the nematode burden, the equids’ body condition, and their haematological values. The research suggests, despite the high infection rate, the nematode burden did not significantly affect the equids’ health.

Understanding the Research Context

• The research was conducted on the east coast of Veracruz, Mexico, a region significantly populated by equids, including donkeys, mules, and horses. These animals are used for labor in the area’s rural production systems.
• The aim of this research was twofold: First, the team wanted to calculate the prevalence of gastrointestinal nematodes (GINs) in these working animals and identify the species of GINs involved. Second, they sought to measure each animal’s body condition score (BCS) and haemotological values, then analyze these measurements in relation to the faecal worm egg count (EPG), a measure of GIN infection.
• The research objectives stemmed from a need to understand and address nematode infection in working equids for the sake of animal health, productivity, and sustainable rural development.

Methodology and Findings

• The researchers randomly chose one hundred and forty working equids from five different villages for this study. They collected faecal and blood samples from each animal.
• The McMaster technique, a common parasitological diagnostic method, was used to determine gastrointestinal parasite burdens. Haematological values (including packed cell volume, total plasma proteins, red blood cell count, and white blood cell count) were measured from each blood sample.
• The prevalence of infected equids was found to be over 90% with mules having the highest median faecal worm egg counts of 875 EPG. Horses and donkeys followed with 400 EPG.
• Interestingly, the team found no statistical correlation between EPG and BCS or haematological values. This suggested that the high prevalence and parasite burdens did not significantly compromise the health of these working equids.

Implications and Recommendations

• The research introduced valuable insights for formulating strategies to control nematode infections in working equids in the Mexican tropics. Given the lack of significant detrimental health effects observed in this study, future strategies might need to focus more on ensuring other aspects of overall equid health, such as nutrition.
• However, the study also suggested that individual anthelmintic treatment should still be administered to those animals with the highest EPG counts, or if other signs of health compromise become evident. These steps would help to maintain the productivity and welfare of the working equids and the communities that depend on them.