Effect of long-term oral administration of a low dosage of clenbuterol on body fat percentage in working and nonworking adult horses.

Objective: To determine the anabolic and lipolytic effects of a low dosage of clenbuterol administered orally in working and nonworking equids.

Animals: 8 nonworking horses and 47 polo ponies in active training.

Procedures: Each polo pony continued training and received either clenbuterol (0.