National Producer Number definition, categories, type and other relevant information provided by All Acronyms. NPN stands for National Producer Number Search for acronyms, abbreviations,
Height Considerations. There are no height limits for jockeys. However, jockeys tend to be shorter than normal to meet the weight guidelines. The average height for a jockey is between 4 feet 10 inches and 5 feet 6 inches.eight Limits. Depending on specific race and track guidelines, a jockey must weigh between 108 and 118 pounds without clothing and equipment, which can add a significant number of pounds.
Appearance. Body Size: An average thoroughbred horse will reach a height of about 60 to 70 inches, or roughly 15 to 17 hands high (hh), a hand being a unit of equine measurement equivalent to approximately 4 inches.This breed is considered medium in size, and adult horses usually weigh 1,000 to 1,300 pounds.ppearance. Body Size: An average thoroughbred horse will reach a height of about 60 to 70 inches, or roughly 15 to 17 hands high (hh), a hand being a unit of equine measurement equivalent to approximately 4 inches.