'Speciesism' is a term coined by Richard Ryder to make clear the parallels between the treatment of animals and sexism and racism. I bumped into Richard at the Dartington 'Ways With Words' Literary Festival and asked him about the revival of the animal rights movement in 1970s Oxford, a time when Peter Singer, Tom Reagan and others were all starting to think seriously about animal welfare. He pointed out that for most of the 20th Century, the animal welfare movement had been in abeyance, in large part due to two world wars, though it had been lively in the 18 and 19th Centuries. Listen to my short interview with Richard Ryder here (12 mins 50 secs).
You might also be interested in this interview with Peter Singer: