Cardio-pulmonary function values in double-muscled cattle during muscular exercise

Area of Science:

• Veterinary Physiology
• Exercise Physiology
• Animal Science

Background:

• Double-muscled breeds, like the Belgian White and Blue, exhibit unique physiological traits.
• Understanding their exercise response is crucial for animal welfare and management.
• Friesian calves serve as a comparative model for normal physiological responses.

Purpose of the Study:

• To investigate the cardio-pulmonary and metabolic responses to exercise in double-muscled calves compared to Friesian calves.
• To identify physiological limitations in double-muscled calves during physical exertion.
• To elucidate the causes of exercise intolerance in double-muscled breeds.

Main Methods:

• Comparative study involving double-muscled (Belgian White and Blue) and Friesian calves.
• Physiological measurements during rest, exercise (treadmill), and recovery.
• Analysis of blood gases (oxygen and carbon dioxide tension) and acid-base status.
• Measurement of expired gases (volume, O2, and CO2 concentrations).

Main Results:

• Double-muscled calves exhibited inadequate oxygen intake and carbon dioxide elimination during exercise, evidenced by increased PaCO2 and [H+]a, and decreased PaO2.
• Friesian calves demonstrated adequate oxygen uptake and no acidosis during exercise.
• Metabolic acidosis in double-muscled calves was linked to a limited increase in cardiac output and hemoglobin concentration.

Conclusions:

• Double-muscled calves possess limitations in cardio-pulmonary and metabolic responses to exercise.
• Inability to significantly increase oxygen consumption is a key factor in their exercise intolerance.
• Physiological differences highlight breed-specific adaptations and limitations in response to physical stress.