Mimaya-betto was not only general manager of the pasture, but also held the rank as a guard called 'Kurumajiri' and rode '後騎' on horseback along with kebiishi (a police and judicial chief) that followed behind the ox carriage of a retired emperor during his gyoko (imperial visit).
御厩別当は放牧地の総括管理者であるだけでなく、行幸に際しては、「車後（くるまじり）」「後騎」といって、院の牛車の後ろを検非違使とともに騎馬で警護に当たる地位でもあった。