Area loosely approximating everything north from Eighty Mile Beach in the south West, back up to an area east of Broome, then east following the extent of the pastoral leases to the Northern Territory border.
In this zone, which includes tick, Three-Day and majority of the buffalo fly zones coupled with heat, humidity and very heavy monsoonal rainfall, there are greater challenges for Angus bulls, however, they can still be used effectively. Careful management including acclimatization, parasite treatments, seasonal mating and reduced handling during warmer weather is strongly recommended. Almost entirely used in cross-breeding programs and stabilized composites.
Area loosely approximating from Eighty Mile Breach in the north, Exmouth to the West, down to the edge of the Gascoyne catchment to the south and east to the extent of pastoral leases.
Typically, hotter, more humid and experiencing higher rainfall than zone A, Angus bulls and females can perform well when managed appropriately through allowances with nutrition and breeder herd management.
Area loosely approximating the Gascoyne River boundary and the Murchison River boundary.
Inclusive from Exmouth in the north, down to Kalbarri in the south west, across to Mount Magnet and skirting the eastern boundaries of the Murchison and Upper Gascoyne shire boundaries.
Characterised through warm to hot and drier conditions, Angus bulls and females under reasonable management regimes exhibit productivity and longevity.