Calling themselves "cattle and horses" is actually the professors of the Mathematics Research Institute poking fun at themselves. Xu Dajiang, despite his low EQ, would never say such things to Su.
But it's true that Xu Dajiang makes extensive use of the professors at the Mathematics Research Institute.
Day-to-day research tasks and paper requirements are the concerns of the Mathematics Research Institute. However, to conduct research there comfortably, one must not only teach the students of the School of Mathematics, but also dedicate at least two hours a week to student consultations, a task that can't be entrusted to teaching assistants.
In addition, the majority of them must join in the compilation work for the Qiao Class textbooks.