Environment can sometimes alter the rutting age of an animal.有时环境可以改变动物发情的年龄。The young stag was rutting.这头年轻的牡鹿正在发情。The heavy-duty trucks were rutting the road.重型卡车在公路上留下车辙。During the rutting season the big boars have the most terrible mating battles.大野猪到了发情期会为了交配而斗得不可开交。