No. You order what you want, the mill/store mix it to what you want and then deliver it in bulk same as a blend. They even mineralise it for us.Alternatively, only buy from companies that are prepared to give a full ingredients list, so you can make a choice as to whether you are willing to accept any of those fillers. I'd question how much cheaper it is, once you buy in straights (in small loads), cost in your time of peeing about mixing it, don't forget to include the cost of the minerals, and the convenience of a nut/roll that can be fed on the floor. I dare say you can save a small amount, but a tenner a ton doesn't get me excited on the tonnage most sheep farmers will be using.
I get your point, but Soya remains the best source of DUP, and the quantity sheep farmers will be using is miniscule compared to other industries, including the ones making veggie 'meat' replicas.
There's no messing about mixing.
I feed it on the ground outside no problems - I appreciate that wouldn't work in a shed, though and you'd need to use troughs.
The only thing I do is add liquid feed because it's a Rumenco product, stores/mills don't supply/offer it... 10mins a week mixing a batch isn't any hardship.