Nonspecific immune response of peripheral blood neutrophils in two horse breeds (Anglo-Arabian and Spanish-Arabian): response to exercise.

The research investigates the differences in immune responses of peripheral blood neutrophils in two breeds of horses (Anglo-Arabian and Spanish-Arabian), and also the impact of exercise on these responses. It found that while most immune responses remained unchanged, the chemotactic response was consistently higher in the Anglo-Arabian breed.

Research Objective and Study Design

• The primary goal of this research was twofold. The first goal was to identify potential differences in the nonspecific immune responses of peripheral blood neutrophils across two horse breeds —Anglo-Arabian (AA) and Spanish-Arabian (SA).
• The second aim was to evaluate the effects of exercise, more specifically at the aerobic-anaerobic threshold, on these immune responses.
• A total of 11 untrained horses, with an average age of 2.5 years, were considered for the study. The sample group comprised 6 SA and 5 AA breed horses.

Findings

• The study found no statistically significant differences in the various stages of the immune response between the two horse breeds during both rest and immediately after exercise.
• However, the research noted that the neutrophil chemotaxis—an essential process of immune response involving the movement of neutrophils towards the site of infection—was significantly higher at rest in the AA breed as compared to the SA breed.
• Upon analysis of individual breeds, a positive correlation was found between the phagocytic capacity and oxidative metabolism activity in the AA breed during rest. Meaning, as phagocytic activity increases, so does the oxidative metabolism activity.
• Conversely, a negative correlation was discovered between the adhesion capacity and chemotactic response and the phagocytic capacity for AA horse breed immediately after exercise. This indicates that higher adhesion and chemotaxis were associated with lower phagocytic capacity after exercise.

Implications

• The findings of the research may offer valuable insights into the immune responses in different horse breeds, and can be informative for breed choice from the immunological perspective in various equestrian disciplines.
• The results also highlight the potential impact of physical exercise on certain immune functions, thereby indicating possible health implications and the importance of a balanced exercise regimen for horses.