female fluid release

Question
We have a 9 month old female and in March got a young pregnant female.  The pups were born 2 weeks ago.  When we started to introduce the pigs to one another, our 9 month old after doing some sniffing squirted out a white milky substance from her behind and hit the pup in the face.  We have one male and one female pup.  She has squirted when with the male and the female so the sex didn't seem to be the trigger.  Just curious as to what this means?

Answer
Hi Becky

Sometimes a female will spray urine (which can also be milky coloured) into the face of a pig behind her if she doesnt like what the pig is doing. This particularly happens when a male approaches a female to mate with her and she doesnt like it, but, either way, something upset your 9 month old.

Andy