Fifteen Piglets of five group ,each group of three pigs at 1, 14, 28, 42 and 56 days of age were firstly used to study developmental mRNA expression of antibacterial peptide PR-39 by means of RT-PCR.

• 本课题先以1、14、28、42、56日龄的仔猪为试验对象，以RT-PCR法为检测手段，研究不同日龄仔猪抗菌肽PR-39基因表达的变化规律。