Dairies Contribute to Sustainability by Consuming By-Products - Part 1 Wednesday Jan 27th, 2021 News Reporter With California Ag Today, I’m Tim Hammerich. Throughout our food system, there are several by-products that aren’t palatable to humans. Many of these products, like almond hulls and spent brewers grains, might end up in a landfill if not for the California dairy industry. Somerville… “We were able to identify a list of 70 by-products that fed in California dairies.” That’s Scott Somerville, a Ph.D. student in the department of agriculture and resource economics at UC Davis. Somerville… “95% of our survey respondents in the San Joaquin Valley are using by-product feeds. Which means about 90 to 99% of the cow rations fed in the San Joaquin Valley contain some amount of by-product feeds. And almost all of those contain some element of almond hulls. Cottonseed is the next biggest after that, and canola meal after that.”