I've Always Wanted a Pig Farm:

[Wildcard]

Billy you write a lot of gross poems

Ever been on a cross --I like the beginning, but think you need a hyphen here.
country walk with pig shite
slapping you round
like an old punchy boxer --Slowly winds up and by pig shit is going very well. I think maybe you could condense these 4 lines to three jmo
you lift a farm gate
instantly you're carried
two miles over meadows
wild flowers and rape -- I don't know rape as a flower, but even after Googling I feel that it adds nothing to the poem.
seeded carpets irrigated
by shallow rills criss-crossing --This might be an AmE,BrE thing, but crisscrossing isn't hyphenated here.
open veins bleeding out
a not unpleasant stench -- least favorite line. I stumbled. Sorry but I don't have any immediate sugestions.
flies from a sloppy sty
perfume of pig pleasantly pastes
its Eau de toilette on the sinus --solid grin here Nicely done, sir.
a slight heady spell signals
the onslaught of choke -- Without puncuation going from 'choke' to 'gag' is somewhat clunky.
gag reflex kicks in
as throat expands
expelling mushy bits of carrot
peas and cabbage you had for dinner
the countryside
the porkers arse
what a grand experience. --Maybe instead of the closing line being a comment on the two previous things mentioned you would be better served by making it the an equation countryside+porker's ass=the grand experience of it all.

I really don't like gross stuff normally (unless I write it :p ) but this is one I will revisit.

Thanks for sharing.