Step 1: Recall Hisardale sheep breeding.
Hisardale is a synthetic breed developed at Hisar (Haryana, India). It was produced to combine the hardiness of Indian breeds with the superior wool quality of exotic breeds.
Step 2: Parent breeds.
- Female parent: Bikaneri ewes (native Indian breed).
- Male parent: Merino rams (exotic breed with fine wool).
Step 3: Conclusion.
Hence, Hisardale sheep is a cross between Bikaneri ewes and Merino rams.
Final Answer: \[ \boxed{\text{Hisardale = Bikaneri ewes × Merino rams}} \]