Sparql query help

Im trying to do this query...

SELECT ?subject ?objectWHERE { ?subject owl:equivalenteClass ?object FILTER(
?object = "Meat") }

im trying to find the equivalente Class of meat, but it doesn't return what
i want, what am i doing wrong?

if i do this...

SELECT ?subject ?objectWHERE { ?subject owl:equivalenteClass ?object FILTER(
?object != "Meat") }

i get all the equivalent class that there is in the owl. why?