 Illawarras are horned, large framed cattle of a predominantly red colour, with some whites or roans (mix of red and white) .Illawarras produce large quantities of high butter fat and protein milk.In an official test in 1998, Illawarra cows averaged 4,829 litres of milk, with slightly over 4 percent butter fat and 3.4 percent protein, under Australia's pasture production system.