《农桑辑要·孳畜·马驴骡附》
就是说牲畜饥饿时，可以喂粗饲料；已经快饱时，便应喂精饲料引诱着让它继续吃；只要能经常吃得很饱，便没有喂不肥壮的。
谓饥时与恶刍；饱时与善刍，引之令食；食常饱，则无不肥。
That is to say, when the cattle are hungry, they can be fed coarse feed; when they are almost full, they should be fed精饲料to entice them to continue eating; as long as they can eat regularly and until they are full, there is no way to prevent them from getting fat.