Alien object in night poo!

Hi, I'm yet another newbie, both to the site & keeping chickens, having taken on 6 lovely ex-batts 7 weeks ago.

I had a poo query early on which the poo chart helped me with (thanks Aunt Sally) but this one has got me stumped. When I cleaned out the house this morning I found a strange object which didn't look right at all - it was a creamy colour, longish (approx 3"), thick & rubbery looking but when I pulled one of the lumpier bits it broke open & had a granular-like texture. I've taken a photo and will try to include it later if requested (not very savvy on these things, don't know how to shrink them & its 344KB...)

One of the girls has recently finished a course of marbocyl for fever & infection and over the past few days they've only laid 2 eggs per day. I feed them on Ex-Batts pellets from the Smallholder range and mixed corn plus whatever they scavenge from around the garden.

Can anyone help please?

I have had about 5 from my ex-bats. Otherwise they are all fine.

welcome to this forum ... can i say the fun has only just started  within a month your posts on here will rise so much an you'll become addicted