There will be no prosecutions from eight official animal welfare complaints made last summer about New Zealand rodeos, the Ministry of Primary Industries has confirmed.

"Rodeo is a legal activity and has a newly reviewed Code of Welfare where participants and organisers must meet minimum standards," a MPI spokesman said.

"Each complaint was investigated and while some breaches of the Code of Welfare were found, none constituted a breach of the Animal Welfare Act, to the extent they could be prosecuted."

In these circumstances MPI provides advice to help these groups meet the Code of Welfare, the spokeman said.

In May, footage was released to ONE News which showed bull handlers twisting tails and electronically prodding the bulls - a practice that is legal, but not recommended.