If you can manage the logistics, take both! How you use it will depend on the state/age of material.Certainly cow manure from a winter lairage, often cleared in early autumn to accomodate the cattle in the approaching winter will be a sound proposition as it will likely contain a high proportion of straw as well.A blend will not matter, and may have differing minerals and trace elements.Even horse manure with a shaving , woodchip or sawdust bedding will compost in time.
The potential danger of aminopyralid is greater with horse manure Although its tricky to trace the source of hay, if you can find a cattle farmer who grows his own winter forage, he will know what he has used. Silage is made with a range of broadleaf herbs as well as grass, therefore risk free.Such a source has the kit to deliver, its a ‘beer’ thing!! I realise the benefits of life in a rural area.
