Effect of transportation on the sympatho-adrenal system responses in horses.

The research in this article investigates how transportation-related stress affects hormone levels in horses. Specifically, it examined the responses of adrenaline, noradrenaline, and dopamine in stallions transported over various distances. The findings suggest that shorter distances (100km) induced a higher sympathetic adrenal system response than medium to longer distances (200km and 300km), indicating a potential adaptation process during transport.

Research Objective

• The study aimed to understand the impact of transportation stress on hormonal responses – specifically adrenaline (A), noradrenaline (NA), and dopamine (DA) – in stallions, with a focus on varying distances.

Study Design and Methodology

• A total of 42 stallions were observed both before and after road transport for specified distances of 100, 200, and 300km, traveled over periods of 1 to 3 hours.
• The levels of adrenaline, noradrenaline, and dopamine in the animals’ blood plasma were measured before and after transportation.

Key Results

• The study recorded a rise in plasma adrenaline and noradrenaline after a 100km journey, and noradrenaline levels also rose after a 300km journey.
• Dopamine levels increased after 100km and 200km journeys, but fell after 300km.
• This data was proven highly significant statistically (P<0.0001).
• The researchers found clear variances and interactions among groups and time for adrenaline, noradrenaline, and dopamine level changes.

Conclusion and Implications

• Short distances (100km) resulted in a higher sympatho-adrenal response in horses than longer journeys (200km and 300km).
• This may suggest that horses undergo an adaptation process over time during transportation.
• It indicates that adrenaline and noradrenaline may be the key neurotransmitters involved in maintaining homeostatic balance and mitigating the effects of perceived transport stress.