what are your thoughts on a grower diet for GOS of 40% bruised barley 40% bruised oats and 20% soya bean meal?
i meant 40% by volume or weight? a scoop of ground barley would weigh differently to a scoop of whole oats. for example.
you would have to find how much salts and vitamins etc pigs would need, bearing in mind that they can get salt poisoning as they cant sweat. Vitamins ADEK are fat soluble so would b in good quality oil. Seaweed has (i think) vit b? so has marmite etc. vitamins in veg depend on the age of the veg.
if they are free ranging im sure they can supplement their diet to a degree, tho that would be dependant on whats available to them and condition of ground.
the risk you take with mixing your own grains is not getting the protein levels right, which could mean your meat is too fatty etc.
there are books written on this subject im sure. try researching some feed companies and working from there.