in the HE group roost-ers (Table 2). There was no difference in other gross semenparameters between the groups. There was no differencein sperm DNA fragmentation between the groups (Fig. 1).In the seminal plasma samples of both the C and HEgroups MMP-2 activity in the form of two bands at 72and 62 kDa molecular weight was observed correspondingto pro-MMP-2 and MMP-2 respectively (Fig. 2). However,densitometric analysis did not reveal any difference inactivity between the groups. The mRNA expressions ofHSP27 and HSP70 genes in sperm were significantly lower(P < 0.05) in the HE group roosters (Fig. 3).