Products already available include oviductal and uterine fluids coming from healthy animals with all the sanitary certificates and classified according to the phase of the estrous cycle when they were collected (Carrasco et al., 2008a2008b)

The fluids have been processed in our laboratories under strict biosafety conditions and after purification and lyophilization, their biological activity has been assessed. The test used for biological activity is the Zona Pelucida (ZP) digestion time (Coy et al., 2008).

We have found that the ZPs of oocytes from different mammals increase their resistance to enzymatic digestion to a greater or lesser extent when they are incubated in the oviductal fluid (Mondéjar et al., 2013).