Room temperature vulcanizing silicone sheaths on a reusable support for progesterone delivery in estrous synchronization treatments in cattle

Y-shaped inserts made of different polymers were designed as supports of RTV silicone sheaths to test the in vivo release of progesterone. Field evaluation showed that RTV silicone sheaths containing 0.75 g of progesterone were at least as effective at estrous synchronization as commercially available intravaginal inserts.