The animal rights body claimed that the findings proved there was cruelty towards bulls and disregard for human life.
"PETA India documented the cruelty which was observed during events in four districts of the state (Tamil Nadu) between January 14 and 28, 2018, in detail in a report and in photographs and video footage," it said in a statement.
The video shows that bulls were "hit, whipped and poked" with metal and wooden sticks inside the 'vaadi vaasal', and their tails were "twisted and yanked" to force them to run towards the "menacing" crowd, PETA said.
PETA said that onlookers hit and jumped onto bulls fleeing the collection yard -- an illegal practice known as "parallel Jallikattu"-- and the bulls suffered severe injuries and collapsed.
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It also said that it plans to submit these findings in the Supreme Court in support of its ongoing case challenging the constitutional validity of the Prevention of Cruelty to Animals (Tamil Nadu Amendment) Act, 2017, which permits Jallikattu in the state.
"India's true culture is one of kindness to cattle and respect for life not forming a violent mob to bully terrified animals," said PETA India CEO Dr Manilal Valliyate.
PETA India said that since Tamil Nadu began allowing Jallikattu in 2017, at least 26 humans, including a police officer and a teenager, have been killed, and more than 2,500 reportedly injured.
In 2014, the Supreme Court in a ruling (AWBI vs A Nagaraja and others) upheld that Jallikattu was "inherently cruel" and therefore illegal under the Prevention of Cruelty to Animals (PCA) Act, 1960, thereby striking down the Tamil Nadu Regulation of Jallikattu Act, 2009, which aimed to allow the races, the statement said.
The state's effort to overturn this ruling in its review petition was dismissed by the court on November 16, 2016, the animal body said.
In 2011, the central government banned the use of bulls in performances through a notification issued under the PCA Act, 1960, PETA India added.