None of the four jockey deaths in Australia in the past 14 months can be blamed on the rider, the Australian Racing Board says.
Board chief executive Peter McGauran says two deaths this week have been caused by horses breaking down and have nothing to do with the rider.
South Australian apprentice Caitlin Forrest died in hospital on Thursday morning after a four-horse fall at Murray Bridge on Wednesday, the day after Queensland rider Carly-Mae Pye died from injuries she suffered in a trackwork fall.
Their deaths follow the fatal accidents involving two other female jockeys last year.
Champion jockey Simone Montgomerie died when her horse threw her to the ground on Darwin Cup day in August, while Desiree Gill was killed in a fall on the Sunshine Coast in November.
McGauran says the deaths were racing accidents and had nothing to do with gender.
McGauran says in both accidents this week, the riders were in front when their mounts broke their legs.