A spring oat developed by the Cereal Research Centre (formerly Winnipeg Research Centre) in Winnipeg, Manitoba. It bears the accession name Robert 68 and OT275 and was tested in the Western Oat Co-op Test from 1993 to 1994. AC Assiniboia was licensed by the Food Production and Inspection Branch in 1995.

A backcross program was used to develop this line. The pedigree is Pc 68 / 7*Robert

Based on agronomic, kernel quality and disease data, AC Assiniboia is well suited for the oat growing area of western Canada.

AC Assiniboia is a backcross line of the oat cultivar Robert. Like Robert, AC Assiniboia possesses stem rust resistance genes Pg-2, Pg-9 and Pg-13 giving it resistance to all known stem rust races in North America except race NA26 and NA32, which occur only in eastern Canada. It is resistant to all races of loose and covered smut to which it has been tested. It has good resistance to barley yellow dwarf virus (BYDV). Being a backcrossed line of Robert it likely also has the crown rust resistance genes of Robert, which has Pc-38, Pc-39 and a third unknown gene. In addition, AC Assiniboia carries Pc68. These genes in combination confer good resistance to all prevalent races of oat crown rust in the prairie region of North America.

AC Assiniboia has a test weight similar to Dumont and Cascade but less than that of Derby. Like Robert, its kernel weight is greater than Dumont, Derby and Cascade. The fraction of plump kernels is similar to Derby and slightly greater than both Dumont and Cascade; the fraction of thin kernels is similar to Derby and Cascade but slightly lower than that of Dumont. Like Derby and Robert, AC Assiniboia has a hull that is thinner than Dumont and Cascade. The protein content of AC Assiniboia is similar to Dumont and Cascade but slightly higher than that of Derby. The oil content of all these lines is similar. Like Robert, AC Assiniboia has a tan hull colour.

Agronomically, AC Assiniboia is similar to Robert. It is slightly earlier in maturing than Dumont and Derby but later than Cascade. It has better lodging resistance than Dumont, Derby or Cascade. It is similar in height to Dumont but shorter than both Derby and Cascade.

In the black soil zone of Manitoba and Saskatchewan the yield of AC Assiniboia is greater than that of Dumont and Cascade, similar to that of Derby. In the presence of crown rust (for example at Glenlea late, Portage or Morden in 1993 and 1994), AC Assiniboia shows a yield advantage. Further west, like Robert, AC Assiniboia does not yield as well as the check cultivars. The presence of barley yellow dwarf virus has not been widespread in 1992-94 so the advantage of AC Assiniboia's BYDV resistance has not been demonstrated during this time period. The support for registration of this line should be based not on its improved yield advantage compared to the checks but rather on its ability to yield consistently even under conditions of a crown rust epidemic.