fodder
noun [ U ] uk/ˈfɒd.ər/ us/ˈfɑː.dɚ/
(ANIMAL FOOD)
（奶牛、马等家畜的）饲料，秣
food that is given to cows, horses, and other farm animals
(USEFUL PEOPLE/THINGS)
（为实现某目的）可利用的人（或物）；素材
people or things that are useful for the stated purpose
Politicians are always good fodder for comedians (= they make jokes about them). 政客们往往是喜剧作家的好素材。
See: cannon fodder