More specifically, the cattle are ‘Pasture-Fed’, and on deep-rooted native species (mostly perennials).  We don’t use the term ‘Grass-fed’ anymore, as cereal crops are technically a species of grass, and stock can be grazed on these more ‘artificial’ pastures (usually a monoculture, and these annual species are only shallow-rooted).  The reason farmers put cattle onto these crops is because the soft green feed is easily digestible and high in energy which equates to growth.  The growth rates for cattle grazing on a barley or oats crop can be up to 2kg/head/day higher than those rates achieved from the native pasture, being virtually nil for the winter months and about 1kg/head/day for the spring months (winter and spring are when these winter cereals are grazed).