What is the difference between Erza pig and native pig in feeding?

I am a farmer in Leshan, Sichuan. For a long time, Erza pigs have been fed the same as native pigs, but Erza pigs are always not in estrus, very annoyed, how to raise Erza pigs, what problems should be paid attention to, and what is the difference between Erza pigs and native pigs?