Roosters have their comb chopped off to make lip fillers. The rest of their body is minced into feed for Danish mink farms. The Swedish company Bohus Biotech breeds tens of thousands of roosters to be slaughtered specifically for lip augmentation and anti-wrinkle creams. Their products use hyaluronic acid extracted from the comb, although synthetic alternatives are readily available and already in use!
The roosters are bred to have as large of a comb as possible, in order to contain as much hyaluronic acid as possible. At 28 weeks of age, they are taken to slaughterhouses and have their comb chopped off. The rest of their body is minced and turned into mink food, biogas or manure.
Although it is forbidden within the EU to test cosmetics on animals, there is no ban on making products from animals.