https://www.forbes.com/sites/ariannajohnson/2024/04/30/is-chicken-feces-behind-the-bird-flu-outbreaks-in-cows-heres-what-to-know/?sh=744a434f8ed3 “A 2008 survey of over 16,000 poultry producers nationwide, completed by the U.S. Poultry & Egg Association and the National Chicken Council, suggested that only 1% of poultry litter was fed to cattle,” So while not a ton of cattle, it is still an issue it is happening at all

Notice the wording on that. It isn’t “1% of cattle eat chicken poo” it’s “1% of the total amount of chicken poo is fed to cows.” They don’t mention the amount of cows actually eating it, and this is a survey, so 1% is almost certainly a very low estimate, as there’s no reason to think others would just lie about it.

And if you’ve ever kept chickens before, you’ll know how much they love pooping, so even 1% is still a huge number.