It is clear that “dominion” does not include killing animals for food.
And God said: "Behold, I have given you every herb yielding seed which is
upon the face of all the earth, and every tree that has seed-yielding fruit
-- to you it shall be for food." (Genesis 1:29)
There is no disputing that, according to the Torah, God asked human beings
to be vegans in his very first conversation with Adam and Eve.
In fact, God issued those instructions right after he gave humans “dominion”
over the animals.
So it is clear that “dominion” does not include killing animals for food.
The great 13th century Jewish philosopher Nachmanides explained God’s reason
for excluding meat from His dietary ideal:
“Living creatures,” Nachmanides wrote, “possess a moving soul and a certain
spiritual superiority which in this respect make them similar to those who
possess intellect (human beings) and they have the power of affecting their
welfare and their food and they flee from pain and death.”
Another great Medieval sage, Rabbi Joseph Albo, offered an additional
reason.
"In the killing of animals there is cruelty, rage, and the accustoming of
oneself to the bad habit of shedding innocent blood,” Rabbi Albo wrote.
Immediately after giving these dietary instructions, God saw everything that
he had made and "behold, it was very good" (Genesis 1:31). Everything in the
universe was as God wanted it, with nothing superfluous and nothing lacking,
a complete harmony. Veganism was part of that harmony.
Today, some of our most prominent rabbis are vegan or vegetarian, in
accordance with the Torah ideal. And it is no coincidence that a vegan diet
is the simplest way to be kosher.