《明史·志·卷五十》
寺丞分管京卫、京郊内以及山东、河南六郡养牧、寄养马匹。
寺丞分理京卫、畿内及山东、河南六郡孳牧、寄牧马匹。
The Assistant Minister oversees the breeding and boarding of horses in the capital guard, the suburbs of the capital, and the six counties of Shandong and Henan.