1. Ram scrotal circumference measurements
2. WJ Bremner, IA Cumming, C. Winfield, DM Kretser, D. Galloway, DR Lindsay, and DT Pearce (1984 )-In ‘Reproduction in Sheep ’, Australian Academy of Science, Canberra, p16 .
3. Variations saisonnières du diamètre testiculaire et de la morphologie des spermatozoïdes chez le bélier Vendéen et chez le bélier Texel
4. GP Davis, CJ Twaites, GN Hinch, BP Kinghorn, DR Lindsay, and DT Pearce (1984 )-In ‘Reproduction in Sheep ’, Australian Academy of Science, Canberra, p247 .
5. DB Galloway (1983 )-Reproduction in the ram. AMRC Review No. 10, p1 .