Sperm mobility: mechanisms of fertilizing efficiency, genetic variation and phenotypic relationship with male status in the domestic fowl, Gallus gallus domesticus.
David P Froman, Tommaso Pizzari, Allen J Feltmann, Hector Castillo-Juarez, and Tim R Birkhead
Proc Biol Sci. 2002 March 22; 269(1491): 607–612. doi: 10.1098/rspb.2001.1925.