Why does a pellet have a round shape?

Since the pellet mill was developed decades ago a feed pellet for farm animals has had a cylindrical shape, which sort of symbolises the level of innovation in feed processing. This lack of innovation encouraged a group of companies in the Netherlands to set up a Feed Design Lab with the aim to support innovation and education in feed processing and by connecting all relevant parties that are active in and around the feed manufacturing industry. A recent report by the US Department of Agricult