Agricultural;
Science;
and;
Technology;
College,;
Jilin;
132000,;
China;
Animal;
Husbandry;
Bureau;
of;
Jilin;
Province,;
Da'an;
131300,China;
Agricultural;
University,;
Changchun;
130118,;
China;
瘤胃发酵; 玉米秸秆; 氮含量; 体外; 饲料配比; 粗蛋白水平; 粗蛋白含量; 微生物生长;