protein efficiency ratio Published June 23, 2015 | By protein efficiency ratio (PER) ສັດສ່ວນຂອງນໍ້າໜັກເພີ້ມຂອງສັດ ຕໍ່ນໍ້າໜັກຂອງໂປຣຕິນທີ່ສັດກິນ.