Eggs were developing and now they're not

[ahenchey]

I hatch hundreds of birds. So far I've hatched 400 this year. I have GQF incubators. Everything is hatching great....except my Jubilee Orpingtons. At the beginning of the season they were developing and hatching. However, about a month and a half ago they just stopped developing. I have 3 hens and 2 roosters. So we put the other rooster in there thinking maybe it was the first roo not doing its job. I still haven't had an egg develop. What could be causing this? I know it's not my incubator because of all the other eggs that are hatching. AND these were fertile and hatching when I started and that only lasted a few weeks.

 

[LaFleche]

I hatch hundreds of birds. So far I've hatched 400 this year. I have GQF incubators. Everything is hatching great....except my Jubilee Orpingtons. At the beginning of the season they were developing and hatching. However, about a month and a half ago they just stopped developing. I have 3 hens and 2 roosters. So we put the other rooster in there thinking maybe it was the first roo not doing its job. I still haven't had an egg develop. What could be causing this? I know it's not my incubator because of all the other eggs that are hatching. AND these were fertile and hatching when I started and that only lasted a few weeks.

• How old are your Orpingtons?
• How is the temperature where you live?
• What exactly do you feed them?
• When did you last deworm them?
• Did you treat them with antibiotics lately for signs of cold or sneezing?
• Did you properly trim back their butt fluff to facilitate fertilisation?
• Is there some antipathy regarding one of the roosters?
• Did you change their coop set up or change coops lately?
• Did you check the feet of the roosters for any signs of bumble foot or injuries that might impede proper mating?
• And lastly: Did you check if they perhaps might be too fat?