Hey me and azarHiro have a great idea for this,

Throughout the three days our little batch of Animal hybrid people will be Tested and at the end of the three days, the person who failed the most, will be Killed.

and the last person alive will have his Genes used to Mass clone Animal soldiers and train them, so it will be like some kind of Dark reality TV show 

except with Animal people, and death, and nobody is Watching except for the Military