|According to an interview with Brown in the Re:Search "Pranks" book, Hermann Nitsch was inspired by Brown's meat performance.
I've had no success so far determining whether Brown's work preceded or followed Carolee Schneeman's Meat Joy.
Most accounts make the two contemporaneous, e.g.:
The relationship between carnage and carnality is explored in some of the earliest recorded art using meat. Carol Schneeman’s 1964 performance Meat Joy – shown first in Paris and then again in New York City – was a Dionysian piece in which eight partially nude figures danced and played in raw fish and chicken, sausage, paint, and paper. It was meant to celebrate flesh as a material.
The same year, American performance artist Robert Delford Brown’s Meat Show also used meat to invoke sexuality. In the Washington Meat Market, he created brothel-like rooms out of tons of blood and raw meat strewn with yards and yards of sheer fabric suggestive of lingerie. Visitors walked through the decorated meat locker in white coats and were then fed sausages. Brown, notorious for invoking shock and scandal in his avant-garde art, located the viewers’ own consumption of meat while meat surrounded them. The show only lasted three days.