It was the other way around.
The companies that built the ovens for Auschwitz and the other concentration camps originally built crematoria ovens for disposing of livestock carcasses. When the Nazis needed to dispose off large numbers of bodies from the concentration camps they initially burned them on pyres, but eventually they contracted the company A.J. Topf & Sohne which had experience with building crematoria ovens for livestock carcasses.
This was fairly typical for the holocaust. German companies profiteered extensively from the camps. A subsidiary of IBM produced the machines which kept records of prisoners. IG Farben, which was part owned by Bayer, held the patent for Zyklon B, the Cyanide pesticide used in the gas chambers (the poison was actually produced by ther companies however ), and many other german companies profited from slave from the camp's inmates.
That's part of what made it one of the worst genocides in history. They did not simply kill millions of people. They turned mass murder into an industrialised business venture.