http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Reproduction and ultrasound examination in cattle
Reproducción y control ecográfico en vacuno: el ciclo estral desde una nueva perspectiva. English
Importance of the use of ultrasonography in dairy cattle -- Ultrasound technology -- Periodic examination and ultrasonography: practical use -- Ultrasonography and pathological conditions