Unfortunately I think this will disproportionately affect smaller farms.
The problem is with factory farms with thousands of animals, but they can foot the extra tax bill no problem and simply raise prices to keep their profit margins and smaller family farms will hurt.
If the punishment for a crime is a fine then it’s only a crime for the poor.
Putting limits on how many farm animals can be possessed and encouraging the public to eat less meat would probably be more effective at actually reducing emissions.