The effect of roughage source on exercise performance and metabolism in thoroughbred horses.

The research article investigates the effect of different types of roughage (alfalfa and non-alfalfa) on the metabolic and cardiorespiratory function of thoroughbred horses. The results indicate that the type of roughage does not significantly impact these functions nor exercise performance.

Research Methodology

• The researchers used six mature thoroughbred horses that were already pre-conditioned for the experiment.
• The horses were assigned to two types of diets: one with alfalfa (a rich source of nutrients) roughage and the other with non-alfalfa roughage. Both diets contained the same amount of calories.
• Each diet type was provided for two weeks, after which the horses underwent an exercise test. After the test, the diets were switched and the same procedure followed.
• The exercise routine involved a high-speed treadmill and an incremental test method to assess exercise capacity.

Data Collection

• Arterial blood samples were taken for blood gas analysis and acid-base balance measurements, which offers insights into the body’s metabolic state.
• Venous blood samples were drawn for lactate and red blood cell potassium analysis. The levels of lactate could indicate the intensity of exercise and the potassium levels help in assessing muscle function.
• The researchers also collected mixed expired gas samples from the horses to measure oxygen consumption, carbon dioxide production, and respiratory exchange ratio. These measurements provide information about a horse’s ability to utilize oxygen and their metabolic rate.
• Heart rate was observed through telemetry ECG for potential cardiorespiratory issues, while respiratory frequency was noted through simple observation.

Research Findings

• There were no notable differences in the horse’s treadmill exercise capacity on both diet types.
• Similarly, no significant differences were observed in the metabolic or cardiorespiratory measurements before, during, or after the exercise phase.
• Therefore, it was concluded that the source of roughage (alfalfa or non-alfalfa diets) does not impact the cardiorespiratory and metabolic function during or post-exercise, nor does it affect performance endurance during a treadmill exercising test.