How can rigor mortis be avoided in animals?

Rigor mortis is a natural and normal process that occurs in the carcass of all dead animals with developed muscular systems. It is caused by the continued activation of myofibers that eventually become "stuck" in the contracted phase. When all the myofibers are contracted and remain that way, the overall carcass becomes stiff and is said to be in rigor mortis.

After a while, the myofibers start to break down under bacterial digestion and the rigor mortis will eventually collapse.

There is no way to avoid rigor mortis to the best of my knowledge.