Body Condition Scoring of Horses
Body Condition Scoring (BCS) is an objective system of evaluating a horse's level of body condition (amount of stored fat) and assessing a numeric score to facilitate comparisons between horses. Many owners fail to recognize significant variations in the weight of horses or variations due to age and breed types. This often results in overfeeding or underfeeding.
Figure 1. Diagram of Areas Emphasized in Condition Score (Adapted from Henneke et.al. 1981, Texas A&M)
Body condition scoring involves the palpation and visual assessment of the degrees of fatness of various areas of the horse, such as: over the ribs, tailhead area, neck and withers, and behind the shoulders. (Figure 1.) Fat reserves in these areas depend on the balance between energy intake and energy loss, for various activities.
If there is a negative energy balance (energy loss greater than energy intake), then weight, and subsequent body condition, will be lost. This energy balance depends on such factors as: availability of food and water, weather (e.g., ambient temperature and wind chill), reproductive activity (e.g., pregnancy, lactation) and physical activity demands for growth and health status. A positive energy balance (energy expenditure less than energy intake) will result in a horse adding fat and muscle and improving body condition.
The body condition score system described here is mainly based on the system described by Carroll and Huntington (1988)(1). Palpation and visual inspection of the ribs, tailhead area, neck and withers, and behind the shoulders, facilitates the comparison of horses with differing amounts of stored body fat, independent of body size or breed of horse.
Figure 2 shows the profile lines for the various body condition scores. The profile of BCS 0 and 1 follow the anatomical skeleton and describe stages of emaciation and extremely thin respectively. A score of 3 has a smooth appearance to the skeletal structure and represents a horse in optimum body condition for maintenance and is neither gaining nor losing weight. Horses scoring 3+ to 4 have a rounded appearance to their skeletal structure. They are in above average flesh but this should not impair their reproductive ability, especially if they are being maintained in outdoor housing during the winter.
A long hair coat can be misleading. Some conformational differences make it difficult to apply certain criteria to a specific animal. For example, animals with prominent withers, or flat across the back and mares heavy in foal (weight of the foal pulls skin taut over the ribs) may cause body condition scores to be lower than they actually are. However, when properly applied, the scoring system is independent of size or conformation of the horse.
Figure 2. Lumbar Vertebra-Anterior View Indicating Profile Lines for Each Body Condition Score
Figure 3. Body Condition Scoring (adapted from Carroll C.L. and Huntington P.J., Body Condition Scoring and Weight Estimation of Horses)
When evaluating animals, there will be an animal-to-animal variation; thus the use of the terms "easy-keeper" and "hard-keeper". Easy-keepers include any of the individuals of the draft breeds, ponies and quarter horses. They also include the dominant animals in a herd situation. Hard-keepers include many of the individuals of the following breeds: Arabian, thoroughbred and gaited horses. Hard-keepers will also include the shy individuals who are lower on the pecking order in a herd situation. Table 1 summarizes the various body condition scores, while Figure 3 depicts the changes in body appearance.Table 1. Descriptions of Anatomical Differences Between Body Condition Scores
As a guide to learning the scoring system and interpreting the results, examples of "typical" condition scores are listed below. There will be a range of condition within each score so it is sometimes convenient to assign +'s and -'s or half point scores as in 2.5 or 3.5.
The BCS system is often used when evaluating individual animals. However, when dealing with a group of horses, changes in the body condition from month to month as a result of changes in total feed being fed, or feed quality and utilization, can be evaluated. Follow the instructions and evaluate a group or herd of horses throughout a winter feeding period or throughout the year.
The individuals who need extra care and energy are those whose body condition scores are 2 or less. These individuals usually include: older horses with poor teeth; young and shy horses that are competing for food; aged mares in foal; or mares that have been dragged down by lactation. Horses with a body condition score of 3.5 and above are usually the "easy-keepers", the dominant individuals, and ponies.
Nutrition was improved for the herd, especially those with body scores of less than 2. By the end of December, their body scores had improved and, by March, they were all greatly improved.
A consistent method of body condition scoring is a useful management tool. It will improve communication between stable employees, owners and veterinarians by providing a descriptive method, which is affected by changes in nutrition, physiological level of activity, or environmental conditions. It promotes a better awareness of feed utilization and allows for changes to feeding regimes based on individual and/or herd responses.
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