Do you have direct links to any of this?
Farm tax is unlikely (although still possible): https://www.fb.org/newsroom/afbf-statement-on-confusion-surrounding-a-proposed-methane-tax
How taxes on cows would be calculated if it happened: https://www.sdfbf.org/Article/AFBF-A-methane-tax-is-not-included-in-the-current-Build-Back-Better-Act