A report by KPHO News of Phoenix does not indicate who pledged the additional funds.
Previously, the payout was $25,000.
The advocates are still upset that others are getting rid of the horses when they had offered earlier this year to do the same thing.
The incident must not interfere with the removal of wild horses by the Forest Service according to a representative of the Center for Biological Diversity, the group that instigated the roundup of the Jumping Mouse horses in March.
RELATED: Forest Service Confirms Facts as More Alpine Horses Found Dead.
UPDATE: Added video.