Horse Weight Often Underestimated

A horse’s weight is an important statistic for horse owners, managers, and veterinarians to know when formulating a diet or medication dosage for the animal. Keeping track of weight fluctuations can also help mangers identify problems that could lead to a marked loss of condition, or in the opposite case, an increased risk of colic or laminitis.

Surveys have shown that even experienced horsemen routinely underestimate horses’ weights. One survey, conducted by the University of Florida, compared the responses of horsemen (average experience level of 15 years) and equine practitioners.

Both groups indicated overwhelmingly that calculating medication dosages was the primary reason to measure a horse’s weight, while determining feed levels was ranked second in importance. Only 10% of the veterinarians and 12% of the horsemen used a scale to weigh horses; 21% of veterinarians and 53% of horsemen used a weight tape. However, the most prevalent method for estimating horse weight among both groups (96% of veterinarians and 68% of horsemen) was visual assessment.

The researchers tested the accuracy of visual assessment by asking both groups to estimate the weights of five mature horses that had been weighed prior to the test. Over 85% of both groups underestimated all the horses’ weights by an average of 150 to 185 pounds (68 to 83 kilograms). Researchers found no correlation between the accuracy of the estimates and the person’s years of experience.

Use of a scale is the most accurate method for weighing a horse. These scales now come in relatively lightweight forms, which can easily be transported by two people. The process takes only minutes per horse and yields a great amount of information, particularly when consistent records are kept and monitored.

Read more in Advances in Equine Nutrition I.