No zoo in Russia wants a bull. Besides Rostov (they should have replaced a bull even before inbreeding started, and Sitara would be pregnant soon) the rest of Russian zoos have cows unsuitable for breeding - Ekaterinburg (Dasha, 40), Kaliningrad (Pregolja, 50), Gelendzhik (Chani, 57), and recently Taigan safari park in Crimea got 2 cows (Jenny, 47 & Magda, 45) that were retired from circus after fighting on show. Kazan zoo is planning to keep only Africans (likely those with tusklessness/small tusk genes that should not be bred at all). Moscow Zoo doesn't work with circuses and Russian trainers avoid bulls (Ecol's fate would be better if she was born with another gender).