This is an extremely broad question. The basic answer is, yes.
The simple reason is that when renewing pasture, it is not wise to go from grass to grass, and brassicas provide a very good break crop. Brassicas are also used to ‘break in’ a rough paddock before resowing permanent pasture.
What sort of value can you place on this?
Then of course take the swede and kale type crops where the feed is grown at under 10c / Kg of DM and crops grow anywhere from 10 – 20 tonne of DM / Ha. These crops are an extremely important tool for some farms winter carrying capacity, and they impact hugely on Gross Profit.
In short, each crop needs to stand on its own and the purpose for which you are planting it needs to be decided upon. For that reason, we feel that it is not possible to give a blanket answer to the question ‘are brassicas financially viable’.