RE: [RC] [Consider This] How Much Weight Can Your Horse SafelyCarry? - heidiThe thought struck me in reading this that once again too much is being read into an inaccurate extrapolation from one species to another.
First, consider this: The 10% and 15% recommendations are made for children--immature people. We would not consider putting the sorts of weights on the backs of our yearlings and 2-year-olds that we easily put on mature horses, and as adults, we can safely carry weights that might be damaging to the immature spines of youth. Due to the age issue alone, these percentages have no bearing on how we load mature horses.
Second, consider the differences between species. The equine spine is constructed with an upward arch (look at the vertebral column itself, not the profile of the horse's back) which enables it to bear weight fairly efficiently. (Think of the slight upward arch of the bed of a flatbed semi truck, or of a bridge, or of an arched rafter.) In the human, a backpack causes downward compression forces that are not very efficiently offset by the mechanical construction of the spine.
Third, and related to #2 above, the horse is a quadruped and the human is a biped. Coupled with the spinal construction, the horse's means of locomotion is more efficient for carrying weight over distance. The human is very unspecialized for this kind of work--the human's great specialty is the brain, which equips the human to figure out other ways to get things done.
Fourth, Marsh brings up an excellent point about conditioning!!!
I think the work being done by various agencies regarding the safety of heavy backpacks in kids is excellent--but be careful in carrying over specific numbers to the equine world, because there are a lot of variables that make the horse far more able to carry weight safely and well that kids simply don't possess.
Heidi
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