Fertilised eggs not developping

[geniva10]

I have some silkies ive been trying to hatch now for 2 months with no luck. The eggs are fertilised (bullseye) but yet do NOT develop in the incubator, I have 3 pullets and 2 roosters, all have been laying for a little over 4 months.
I collect when the eggs are freshly laid and warm so its not the cold.
The eggs ARE fertilised so its not a mating issue.
Its NOT my incubator as i have other breeds whos eggs are hatching with no problems.
Can someone tell me what is going on here? Ive been raising and hatching for 5 years and never had this problem. Should i seperate the roosters? maybe one of them is shooting blanks?? although... im sure they both get turns lol.

 

[Kiki]

I can't tell if those are fertile or not. I've set many eggs I thought I saw a bullseye eye in but it wasn't really a bullseye.

Have you tried feeding them vitamins for a few weeks before you collect eggs to set?
Have you REcalibrated your thermometer and salt tested your humidity guage?

 

[EggSighted4Life]

Hi there.

I bred, hatched, and raised Silkies in addition to several other breeds for a few years now...

The first one doesn't look like a bullseye to me.

What are you feeding including treats and supplements?

Even if there were nutritional deficits... they SHOULD still develop some and just not hatch or have other deformities or issues... Otherwise I would say Silkies are the one breed that nutrition REALLY impacted outcome... some individuals needing more than the rest of the flock.

What many people don't realize is that even though a hen is laying eggs... she could actually be the one with fertility issues... just having an egg doesn't make it viable.

Honestly, you better believe I would remove at least one of them "roosters"... that's too many and over mating causing stress can be an issue.

Other possible causes... of infertility would be to much inbreeding.

I might, just to get this figured out... try hatching only from pairs to test the ladies as well.

One thing that heavily impacted my fertility (I believe) was broodiness.

I personally never had to trim fluff butts... but some have said this may be a factor.

Happy hatching!

http://ufdc.ufl.edu/IR00004437/00001

https://www.hubbardbreeders.com/media/incubation_guideen__053407700_1525_26062017.pdf