OK where to start
Meadow hay is a mix of common grass species which can in some cases include Timothy.
Timothy is the common name for a hay Species its latin name is phleum pratense.
Timothy is a species that is high in digestable fibre but also low in sugers and calcium. Hence why it is the recommended feed hay for not only Rabbits but also cattle and horses (PF4P sells over 30 tons a month to the UAE for race horses)
Timothy comes in 2 types dependant on the season. a course first cut (acid green / gold in colour, course stems and leaf with seed heads intact) or a soft second cut (dark green, light brown in colour with very soft broad leaf, very little stem or seed heads) 2nd cut tends to be slightly higher in sugers than the first cut (due to sun exposure)
Timothy tends to be grown best in in the americas (USA and Canada) due to its climate, but also grows well in austrailia (very course hay) or Africa (again fairly course hay, Africa can also get 3 cuts per season 3rd cut is normally used of pellets, makeing into grass meal)
Even though Timothy is a native species of the UK it does not grow to optimum status due to our changeable climate. Imported Timothy will also have a much lower moisture level than british grown hays due to optimum drying methods employed in the states.
I hope this helps.