Table 1.

Overview of piRNA sequencing of fresh and frozen-thawed sperm in giant panda and boar.

Species	Group	Raw reads	Clean reads	Mapped reads	Mapped ratio (%)
Giant panda	Fresh sperm	16,980,071	519,311	85,586	16.48
	Post-thawed sperm	19,571,331	4,488,163	325,288	7.2
Boar	Fresh sperm	18,956,444	9,031,512	2,988,336	15.76
	Post-thawed sperm	16,507,275	7,188,244	2,087,711	13.0