《农桑辑要·孳畜·马驴骡附》
乘骑一天之后，把马放开看它的活动：不在地上打滚的便是筋劳；打过滚不及时站立起来的便是骨劳；打滚起来不抖土的便是皮劳；抖土后不嘶鸣的是气劳；嘶鸣后不溲溺的是血劳。
终日驱驰，舍而视之；不碾者，筋劳也；骣而不时起者，骨劳也；起而不振者，皮劳也；振而不喷者，气劳也；喷而不溺者，血劳也。
After riding for a day, let go of the horse and watch its activities: if it does not roll on the ground, it is muscle strain; if it rolls over and does not stand up in time, it is bone strain; if it does not shake off the dust after rolling, it is skin strain; if it does not neigh after shaking off the dust, it is Qi strain; if it does not urinate after neighing, it is blood strain.