Some might say its a silly question, but here goes;

Short answer no - risk of listeria, although many do and get away with it. I see several sheep each year with listeria after having silage and it's not particularly nice.
 
http://www.horseandhound.co.uk/forums/showthread.php?t=202712

copied and pasted from another website:

Silage
Silage is made by cutting grass and taking it off the field immediately while still wet, or wilting it for 24 hours but without turning and drying. The grass is then put into a clamp and compressed by rolling with a tractor. Finally, it is covered with plastic sheeting and
weighed down by rubber tyres. Silage is sometimes also made in round bales.

Typically silage contains 60 to 75 per cent moisture compared, for example, to just 35 to 45 per cent in bagged forage. When over 50 per cent moisture is present, fermentation inside the plastic packaging cannot be relied upon to produce suitable forage for horses. At worst it may allow the proliferation of undesirable micro-organisms, especially the chlostridial bacteria which cause botulism and can be fatal in horses. Also the acidity, low fibre content and likely high protein levels of silage make it unsuitable for horses.
 
I've fed mine the same silage as the cattle get for 15 years. I have had 2 'control' specimens-17yrs and 15yrs old for the whole of that time an I have never had any problems. I have fed their young ones (all 6 of them) and the assorted fieldmates on it too in winter and have yet to have a problem with it. *touches wood*
 
I double checked on silage last week also (even though deep down somewhere I knew there was a reason it shouldn't be fed). I haven't been able to get hold of hay, so have had to change mine onto haylage instead - but there are cattle on the farm where I keep my horses, and in the farmyard are several vast stacks of silage bales. If only silage was good for them - I'd have tons of it right on my doorstep! Instead, have had to bring haylage in from outside, as I'm not prepared to risk it with silage.
 
A lot of friends of mine feed silage with no problems, but it is a risk you take like any thing.
mine used to be on a cattle farm and loved nothing more than stealing the silge from the cattle, never had a prob.
Can cause major smelly scour
 
I feed mine haylage - my brother makes it and feeds it to his cattle. If you asked my brother the same question he would tell you he feeds the cattle silage. Ours is cut, wilted for at least 24 hours, turned at least once, then round baled and wrapped. It is perfect horse fodder but my brother will not call it haylage for anything!

If you are only able to get forage that is called silage, as Faro has said, it might just be worth checking exactly what it is.
 
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