Chief stipendiary steward Ross Neal says his staff made a decision to abandon the Hastings race meeting based on the best interests of the riders and horses.
Neal, of Wellington, said the stewards came to the conclusion based on all the information in front of them.
"We have a lot of valuable horses running around today so we don't want them to be put in a perilous position with a horse in front of them falling or, indeed, they themselves.
"It's a very hard decision but we make it in the interests of rider safety and we're cognisant of the fact that horses have travelled some distance to get here on a major race day," Neal said.
The authorities had had enough evidence on a horse slipping shortly on straightening up free of any interference.