- perstorpgroupIt’s time to preserve, with ProMyr™! Today Perstorp Feed & Food launched a new microsite for Sweden and the UK! You can find it on www.promyr.com for the UK and on www.promyr.se and www.ensilering.se for Sweden. This website focuses on our ProMyr™ offer, which is our range of solutions that help cattle farmers to maximize their profit levels by preserving the essential nutrients in ensiled forages under various conditions, consequently leading to higher milk production.