The similar numbers of sperm per ejaculate produced by the roosters maintained in the presence and absence of hens might be compensated for by the improved sperm velocity of the former birds, a criterion used in the selection of sperm donors in chickens (Blesbois et al., 2007).
In conclusion, in the presence of hens significantly affects some rooster sperm motility and velocity variables, although sperm volume and concentration appear not to be affected.