First of all, animals should not be used for work because :im-vegan: . But having said that... I see how human labor creates surplus value. And I think I understand why machines don't create surplus value. But what about animals that get exploited to perform work, say the mule that pulls a plow? Like humans, they require a "real wage" to sustain them i.e. food, shelter, and medical attention, right? And if the value of labor power of a day of a mule is say 2 hours (that's how much human labor is invovlved in making feed, etc), then if this mule works for more than 2 hours, are they not creating surplus value for the capitalist that claims to own them?
they aren't but they do involve it. how the animal feels about things depends a lot on how their trained and treated
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yeah if a horse is broken they will hate riding but if you train them by building trust and continue to treat them with care and compassion they will enjoy riding.
breaking a horse is just one particularly way of getting them to take a rider and it's an evil way of doing it