20/10/2024
Another important and informative presentation from Cristina Wilkins on the topic of how curb bits actually work and how they are likely to be experienced by horses.
There's been some new research doing the rounds in which the study authors, and many in the equestrian community, are concluding that curb bits might be kinder for horses, because peak rein tensions are lower on curb bits (when used with a snaffle bridoon) than on snaffle bits used in isolation.
A key problem with the study is that the researchers only measured rein tension- the tension applied by the rider/horse on the reins/rings of the bits. What they didn't measure, is how much pressure is felt on the tongue/bars of the horse's mouth. That is-how much pressure was actually exerted on the mouthpiece- the part of the bit (along with the curb chain) that directly interfaces with the horse's body.
While this question remains to be definitively answered, Cristina's pilot experiment and investigation of the characteristics of the lever action of curb bits dispels some long held assumptions as well as demonstrating that the amount of pressure applied to the mouthpiece of a curb bit can by four times the amount of pressure exerted on the reins.
So while it feels "lighter" and "softer" to the rider, the horse is feeling four times the effect. This makes it highly motivating for the horse to respond to escape or avoid escalations in pressure.
So rather than being "kinder", curb bits allow riders to exert considerable pressure for very little effort- which is the whole point of a lever.
Using the rein tension felt by riders does not tell us what the horse is experiencing and if we are going to make claims about what's better for horses, we need to be able to quantify what the horses are actually experiencing.
Sadly, this important fact is missing from much of the discussion about the findings of this study and many have made a range of claims about the putative welfare benefits of curb bits that are not supported by the type of evidence that was collected.
This is a must watch presentation.
This presentation is about the mechanical action of curb bits, like the ones in double bridles. Curb bits are very powerful, second-class levers of the 'nutc...