Sentences with phrase «porcine zona»
These pills contain purified antigens, which are derived from Porcine Zona Pellucida (membrane of unfertilized eggs / ova of pigs), which on oral intake produces specific antibodies in the treated dog.
http://www.dog-health-handbook.com/
The most promising contraceptive is porcine zona pellucida (PZP), which causes a mare's immune system to attack fertilised eggs.