False, the majority of slaughter houses line the cows up single file and slaughter them one by one in front of each other. The cows see this happening in front of them and hear the shrieks of the dying cows and become agitated and refuse to continue walking. The staff uses cattle prods to shock them and force them to continue walking to slaughter.
Your claim about chickens living like kings also false. Their beaks are cut/melted off with red hot metal clips. This is because they are packed so tightly in living quarters that they become stressed and rip one another's and their own feathers out which leads to infections. They're fed a constant supply of antibiotics to help combat this also.
They're fed on most farms exclusively corn and often animal byproducts so they're micro nutrient deficient but pack on the bulk you mistake for health. Their immune function is poor because of this so they have to use constant antibiotics as a prophylactic which we consume and is contributing to antibiotic resistant diseases such as MRSA. In the US their meat is treated with arsenic to extend shelf life and texture. Which also ends up in our bodies.