Whats the Marxist view of animal rights?
There isn’t one, in so far as Marx himself would not have been aware of an issue. The ethic that informs most animal rights discussions is Utilitarianism, which Marx roundly criticised as bourgeois ideology. Marxists would be more concerned with the “species essence” of mankind, so would presumably focus on the economic aspects of meat production and how workers are exploited in the industry. There have been several “post-Marxist” attempts to relate his thought to modern topics such as ecology, but I have never found any of them very convincing. Die-hard Marxists would probably still dismiss it as bourgeois clap-trap designed to deflect attention from the main problems of exploitation and economic crisis.