A 2013 estimate of annual meat subsidies puts them around $38bn[1], whereas a 2019 industry estimate of annual sales sits at a bit over $217bn[2]. You're free to make your own judgement as to what constitutes "heavily," I suppose, but to me, that first number seems like a substantial portion of the second one.
Edit: The $38bn appears to also include egg and dairy subsidies, but Americans appear to spend substantially less per annum on those commodities compared to meat[3][4], such that the federal subsidies still appear to make up a rather large fraction of the (retail value of!) annual consumption.
Edit: The $38bn appears to also include egg and dairy subsidies, but Americans appear to spend substantially less per annum on those commodities compared to meat[3][4], such that the federal subsidies still appear to make up a rather large fraction of the (retail value of!) annual consumption.
[1]https://meatonomics.files.wordpress.com/2013/06/sample-chapt...
[2]http://www.themarketworks.org/stats
[3]https://www.statista.com/statistics/417446/us-dairy-departme...
[4]https://www.uspoultry.org/economic_data/