饲养试验共进行两期，每期正式期为15天，预试期为7天。
Feeding experiment has been run two times, every formal experiment period has 15 days, advanced experiment period has 7 days.
饲养试验共进行两期，每期正式期为15天，预试期为7天。
Feeding experiment has been run two times, every formal experiment period has 15 days, advanced experiment period has 7 days.
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