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Sysco – the giant, often-invisible food distributor – offers 400,000 products to the bulk of the nation’s restaurants and other institutions. It has a 17.5 percent market share, made $37 billion in sales in 2010 alone, and dispatches a cavalcade of silver trucks daily from 180 locations across the U. S.

In other words, Sysco is wholesale food in America, the same way Cargill is farming and Walmart is, well, all of retail. Or, as Salon put it back in 2009, Sysco has “come to monopolize most of what you eat.” So when the company changes a policy – like it announced it was doing on Monday, when it pledged to do away with meat from pigs raised in gestation crates – there is bound to be a striking ripple effect.

In a statement to the Humane Society of the U.S. (HSUS), the company wrote: “Sysco is committed to working with its suppliers to create a gestation crate-free supply system, for the good of all. Like many of our customers, we’re going to work with our pork suppliers to develop a timeline to achieve this goal.”

As their name implies, gestation crates are essentially steel cages that keep pregnant sows confined in a space roughly the size of their bodies. They’re commonly seen – along with battery cages for egg-laying hens – as among the least humane livestock practices. Animal behavior expert Temple Grandin describes gestation grates as the equivalent of “asking a sow to live in an airline seat” (without lavatory privileges).

Over the course of the last year, thanks to consumer demand, and an ongoing effort by HSUS, most major players in the fast food, grocery, and food service industries have gone – at least on paper – gestation crate-free. The list includes Burger King, McDonald’s, Wendy’s, Denny’s, Carl’s Jr., Safeway, Kroger, Costco, Kraft, and Hormel (the maker of Spam). Even Smithfield Foods – the nation’s largest pork producer – has agreed to phase out the crates by 2017.