40% of UK arable land is used to grow animal feed, the WWF says the system must change to address climate change, biodiversity loss and food security challenges. After three years of no show it’s full steam ahead this week, as the Royal Welsh agricultural show gets back to business. But after a three-year break due to Covid, and amid warnings of dangerously high temperatures, organisers have admitted this year's event has been one of the most challenging to get up and running. All week we're looking at animal feed. It's perhaps the biggest cost a meat producer faces and those costs have been soaring, and that's certainly true in the poultry industry. We visit a feed processor near Winchester. Presented by Anna Hill and produced by Beatrice Fenton.