A.預(yù)防和治療體外寄生蟲B.對圈舍、用具進(jìn)行消毒C.保持綿羊機(jī)體衛(wèi)生D.給綿羊降溫
A.羊群和草料儲備B.羊群數(shù)量C.綿羊瘤胃發(fā)育不全D.抵抗力好壞
A.32℃~33℃B.33.6℃~35.7℃C.38.5℃~39.5℃D.36.8℃~37.5℃