It is estimated that the total number of wild mammals in the world is about 130 billion.
The current world population is 7.7 billion as of October 2019
Combined total is 137.7 billion
Consequently, each additional farm animal is 0.000000001377th of one unit of impact, whatever the unit of measurement will be.
If the progs indicate the unit of impact is a degree of temperature they are out of luck as there isn’t a measuring device on the planet with a limit of detection that is remotely close to that fraction.
So the dairy farmers should just drag out the calculators and do the math on the number of cows times the above fraction of a unit of impact and submit that as the gov.progs cannot prove them wrong.
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Bur but but (cue but monkeys), it’s the intention that counts.