Hi Becks,
A couple of years back it was suggested that it was due to the sperm of an over-active male. Personally as I've quite a few females and it has happened twice with only two of mine I tend to think it's genetic. In my case possibly involving the two females and perhaps my dominant male.
Off the top of my head Edna's had around 15 or so fertile eggs with two multiple eggs and Chloe's only had around 8 or 9 with two mutiple births. I've had quite a large number of eggs from some of my other females without it happening and the propotion of multiples with Edna & Chloe does seem pretty high.
Having said that all their other eggs produced some lovely babies. Chloe's other three fertile eggs in this clutch produced gorgeous 16g babies
Regards
Darren
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