The feed used at the hatcherieswas not bought at the company’s
feed mill, but originated from feed factories outside the foreground
system. The CEENE of the feed used at the hatcheries was
approached by using the CEENE value of the company’s feed. The
production data for the additives used at farms, at hatcheries and at
the feed mill were approached by using the average production
data of several chemicals in ecoinvent.