This week Kate and Nancy delve into the research of Dr. David Mellor and N.J. Beausoleil (2017). The paper is entitled Equine Welfare during exercise: An evaluation of breathing, breathlessness and bridles. This was published in Animals, 7(6) p. 41.  

Dr. Mellor also recently published (2020) "Mouth pain in horses: Physiological Foundations, Behavioral Indices, Welfare Implications and Suggested Solution. (Free on Google Scholar). 

Dr. David Mellor's Youtube link and presentation: https://www.youtube.com/watch?v=rY4yEC7lhco

Bits in U.S. racing: https://www.paulickreport.com/news/nl-list/thats-a-mouthful-racing-bits-explained/#:~:text=Cook%20has%20campaigned%20unsuccessfully%20to,so%20far%20not%20permitted%20it.