Nitrogen metabolism in mature horses at varying levels of work.

The research studies how varying levels of work affect nitrogen metabolism in mature horses. The study observed increased nitrogen retention with increased workload.

Study Design

• Five mature male horses, known as geldings were involved in the research. The horses underwent different levels of work simulating race training conditions.
• The study started with a maintenance period with no forced, followed by 18-day periods where the distance covered by the horses was doubled from period 2 to period 4.
• A four-day nitrogen balance experiment was conducted at the end of each 18-day period. The maximum distance galloped daily, achieved in the fourth period, was replicated in the fifth period.
• This was followed by a decrease in workloads through period 7, and two additional periods (8 and 9) of maintenance with no forced exercise.
• Throughout the study, geldings were fed diets with a consistent protein-to-calorie ratio.

Results

• Findings showed that horses’ nitrogen retention increased (P < 0.05) as the workload rose from the first to the third period, and this elevated level of nitrogen retention was maintained throughout the remainder of the experimental periods.
• Nitrogen retention did not decrease significantly (P > 0.05) from its highest values, noticed at maximum workload in periods 4 and 5, until the end of period 9, which was 34 days afterwards, during a maintenance period.
• Notably, nitrogen retention was higher (P < 0.05) after training compared to before training started.

Implications

• The findings present valuable insights into how exercise and workload affect the nitrogen metabolism in mature horses. Emphasizing on the importance of adequate nutrition that meets the metabolic demands of a horse under varying workloads.
• This research could help in better formulation of diets and exercise regimes for sport horses, thus enhancing their performance and wellbeing.