Oscar nominee Casey Affleck is helping PETA spread the word about the dehorning of cows on dairy farms -- a widespread practice that Affleck calls "inhumane."
In this graphic video, entitled "Dehorning: Dairy's Dark Secret," Affleck explains how the practice is carried out. Dehorning involves the cutting, burning or chemical removal of the horns of cows and other animals.
SCROLL FOR VIDEO
"Cows and calves struggle desperately during dehorning," Affleck says in the video, which shows the animals “thrashing, tossing their heads, rearing up, switching their tails, bellowing, and collapsing to the ground" as farm workers are seen burning off or gouging out their sensitive horn tissue.
"All these procedures are routinely performed without giving the animals any painkillers whatsoever," the actor adds.
Quoting figures from the U.S. Department of Agriculture, ABC News noted in 2010 that "more than nine out of ten dairy farms practice dehorning":
Lyndon Odell, CEO of Willet Dairy, one of New York state's largest dairies, said dehorning is a "standard practice in agriculture" and done to protect both the animals and dairy employees. "Part of the issue with this is cow injury," said Odell, "and also safety for the employees. If you have an animal running around with a sharp horn, they can gore other animals that are in the same group with them or they can injure an employee that's working with the animals."
While the American Veterinary Medical Organization agrees that the dehorning of cattle can convey certain "advantages," it also notes that the practice "is not currently regulated" in the United States.
On the other hand, regulations in several other countries, including Australia, Denmark and Sweden, dictate that the dehorning of adult cows cannot be carried out without the application of an anesthetic.
According to the Boston Globe, Affleck -- who voiced a character in the animated movie “ParaNorman," which was released last month -- will be at his alma mater Cambridge Rindge and Latin School in Cambridge, Mass., on Tuesday to talk about the campaign.
In line with what he says in the film about "avoiding cow's milk, cheese, and other dairy products," free boxes of soy milk will be distributed to attendees.
"Whereas the consumption of dairy products is linked to heart disease, strokes, diabetes, and cancer, fortified plant milks have none of the health risks associated with cow's milk and are cruelty-free," a PETA representative told The Huffington Post in an email.
Should the practice of dehorning be promoted, regulated or stopped entirely? Tell us what you think in the comments below.
WARNING: This video contains graphic content that may be disturbing to some viewers.
Scroll through past NSFW PETA ads below:
Fake snow falls as Kobe Kaige, Penthouse's former 'Pet of the Year' poses nude for a PETA anti-fur ad campaign in Melbourne in May 2008
PETA animal rights activists demonstrate naked and speared with banderillas against the EU cash support for bullfights in front of the EU Parliament's Headquarters in Brussels on October 9, 2008. AFP PHOTO JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
Dutch model Natasja Vermeer (R) is pictured by Italian photographer Angelo Gigli while posing naked for animal rights campaign organized by The People for the Ethical Treatment of Animals, in downtown Rome, 10 December 2007. The campain titled, 'Be an angel for the animals, don't wear the fur.' is the latest anti-fur advert for animal rights group PETA. AFP PHOTO / Filippo MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
In October 2007, actress Sophie Monk lies nearly nude in a bed of crimson chilli peppers for a PETA pro-vegetarian campaign: "Spice Up Your Life - Go Vegetarian"
Naked Australian model and singer Imogen
SYDNEY, AUSTRALIA: Naked Australian model and singer Imogen Bailey holds Reggie the rabbit during filming for an anti-fur campaign ad sponsored by the environmental group People for the Ethical Treatment of Animals (PETA) in Sydney, 25 March 2004. PETA is protesting the commercial use of rabbits - which are found in plague proportions across much of Australia - by the fur and felt industries. AFP PHOTO/Torsten BLACKWOOD (Photo credit should read TORSTEN BLACKWOOD/AFP/Getty Images)
Two nude Peta girls shower on a sidewalk
Two nude Peta girls shower on a sidewalk in Holllywood, California on March 22, 2011 in celebration of World Water Day to expose meat's alleged devastating impact on the planet. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
Barcelona, SPAIN: About one hundred members of the People for the Ethical Treatment of Animals (PETA) and Anima Naturalis, lies down naked silently protest naked in Catalunya square, in center of Barcelona, 21 January 2007. AFP PHOTO/LLUIS GENE. (Photo credit should read LLUIS GENE/AFP/Getty Images)
All Dogs Go To Heaven
Italian television presenter Tamara Ecclestone poses with her dog Buster in a new poster ad for PETA that urges, 'Be an Angel for Animals. Animals Deserve Respect, Patience, and Understanding'.
Adam And Eve
Models Patrick Ribbsaeter and Avi Siwa hold a banner encouraging the closure of all zoos, promoted by the Ethical Treatment of Animals (PETA) at a studio in Bangkok in December 2006
Alicia Meyer Bares All In Lettuce
Alicia Meyer wears labels referring to cuts of meat in a photo shoot for PETA's pro-vegetarian ad campaign in August 2009
Playboy Bunnies For PETA
Playboy models Victoria Eisermann and Monica Harris pose in a bathtub to highlight the U.K.'s water consumption, during PETA World Water Day in London in March 2011
Tony Gonzalez and October
Atlanta Falcons' Tony Gonzalez and his wife October pose nude for PETA's anti-fur campaign in November 2009
Model Becomes Tiger
Malaysian model Amber Chia with body painted tiger stripes poses with a tag line for PETA Asia near Kuala Lumpur in October 2009
Pamela Anderson In China
Pamela Anderson poses topless in PETA's 'Give Fur the Cold Shoulder' anti-fur campaign. In Chinese, the ad reads "Cold shoulders are nothing compared to the pain they feel. Please don't wear fur"
Two half naked women, from the People for the Ethical Treatment of Animals (PETA) painted with Canadian flags, protest against seal slaughter outside the Canada Trade Office in Taipei on March 23, 2011. The protesters said the European Union and the US have banned seal products for years and hope Taiwan can do the same too. AFP PHOTO / Sam YEH (Photo credit should read SAM YEH/AFP/Getty Images)
Two members of the group People for the Ethical Treatment of Animals (PETA) stage a 'naked' protest outside the venue of the G20 summit in Seoul on November 9, 2010. AFP PHOTO/HOANG DINH Nam (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
Animal Activists Encourage Vegetarianism
LONDON - AUGUST 17: Shoppers stop to look at a naked PETA member lying wrapped in cellophane and bloodied on large trays for Pro-Vegetarian demonstration in Covent Garden on August 17, 2006 in London, England. PETA EUROPE aims to demonstrate to shoppers that all animals are made of flesh and bone and feel pain and that eating meat is literally eating a corpse. (Photo by Gareth Cattermole/Getty Images)
PETA's Banned Superbowl Ad
Related on HuffPost: