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【多选题】
下列选项中哪个是正确的选项A.
仔猪过晚开食，饲料品质低劣或者人工补饲不合理，都会影响发育，生长迟缓，从而变成僵猪，这种即称为 “ 食僵 ”
B.
僵猪主要是由于仔猪先天发育不足、后天缺少营养或者由于患有某些疾病而导致生长发育迟缓甚至停滞的一种综合征
C.
猪的背膘厚度与胴体瘦肉率呈负相关
D.
由于仔猪在母体内受胎盘屏障保护，因此仔猪在母体内绝对不会被病原侵袭
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