It's my understanding (and I've got to stress that I
could be wrong) is that gilts with their first litter will produce a fairly small litter, but subsequent farrowings will result in bigger litters, up to a point when the sow is getting a bit older and then they'll start to drop off again.
Litter sizes can drop if the sow is not being bred regularly or if she's not in tip top condition - the fact you've had a good litter must mean you're doing everything right
As for the farrowing itself - were the first 4 bigger than the rest ? Maybe 2 were trying to get out together and it resulted in a blockage (that happened with mine once - nothing for nearly an hour, then a big one followed 2 minutes later by a small one) The fact that she pee'd a lot sounds like there might have been more pressure on the bladder
I don't know if you'll be able to figure out why or whether it will happen again, I certainly wouldn't be put off from breeding from her though - she sounds like a great pig
Just being nosey here (so you don't have to tell me
) How many functioning teats does she have ? How many litters has she had before ? Did you AI or use a boar ? Are you breeding within the same bloodlines or outwith them ? I'm just storing it all away in my brain for future reference
Do you have photos ? Would love to see them
Karen