What is the meaning of they use everything except the squeal in the Jungle chapter 14?

In Chapter 14 of "The Jungle" by Upton Sinclair, the phrase "they use everything except the squeal" refers to the brutal efficiency of the meatpacking industry, which exploits every part of the animal except the sound it makes when killed. This highlights the dehumanizing and inhumane practices within the industry, emphasizing how profit-driven motives lead to the complete utilization of resources, often at the expense of ethical considerations. The statement serves as a critique of capitalism and its disregard for both animal welfare and workers' rights.