6-28. 軟殼蛋的原因~~ wind eggs, possibly caused by ─鈣、磷或維生素D缺乏 -calcium, phosphorus or vitamin D3 deficiency ─病毒感染，例如產蛋下降症候群、傳染性支氣管炎 -A virus, such as egg drop syndrome, Infectious Bronchitis
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