Trying to calculate when eggs fertile by correct rooster!?!?

Discussion in 'Incubating & Hatching Eggs' started by joyous, Jan 7, 2011.

  1. joyous

    joyous Songster

    Oct 3, 2009
    Davenport, Iowa
    Here is my situation. I had all my hens and two roos together all winter. So on the 29th of December, I took the roos out. On the 4th of January I put the correct roos with the hens I wanted to breed with. So with my calculations the eggs can be fertile for up to 10days from a breeding. So I know I can't collect eggs for at least 10 days after separating them. I also read that eggs are not fertile until 5-7 days after mating. So I figure that I can't collect eggs to incubate until about the 11th of jan. That would be 13 days after they were removed from exposure to both roos, and 6 days after they were exposed to the intended roos. Is this correct?????[​IMG]
    Last edited: Jan 7, 2011
  2. Kittymomma

    Kittymomma Songster

    Sep 9, 2009
    Olympia, WA
    Eggs can be fertile for up to 4 weeks after breeding. Three weeks is the usual amount of time people give before collecting eggs for incubation after removing a roo that's not wanted for breeding.

    I figure 10 days after the roo is gone it's a good bet that most/all the eggs are fertile. It's three weeks after the old roo is gone if I want to make sure the chicks only have one daddy though.

    You can also seperate the hens completely and bring in the desired roo after the eggs have been clear for a few days--no bullseye when you crack them open. I like this method when possible because many hens won't stay fertile for three week from the last breeding and by checking the eggs for fertility I can often get started after two weeks instead of the full three. There can be problems with the hens not wanting to accept the roo when you do put him in with them so if you have a young roo and older hens this might not be the best method for you.
  3. KellyHM

    KellyHM Crowing

    Sep 10, 2008
    Lakeland, FL
    Give it at least 3 weeks. Unless you're hatching for you and don't care if you get some mutts.
  4. I wait at least 3 weeks when switching roos.
  5. joyous

    joyous Songster

    Oct 3, 2009
    Davenport, Iowa
    Thanks! your guys saved me a lot of frustration ! Its hard to wait, but I have some rose comb red dorkings I want to breed true, and some planned crosses for experimentation, so its very important to me the right roos with the right hens!
  6. Ridgerunner

    Ridgerunner Free Ranging

    Feb 2, 2009
    Southeast Louisiana
    I agree with the rest on how long they stay fertile. Let me attack the other question. In your situation, this is obviously not a problem.

    It takes an egg about 25 hours to go through the hen's internal egg-making factory. The egg can be fertilized only in the first 15 minutes or so of this process.

    If a mating occurs on Monday, Monday's egg will not be fertile. That 15 minute opportunity passed the day before. If the egg starts its 25 hour journey after the mating occurs, then there is a possibility that Tuesday's egg will be fertile, but there is also the possibility that it will not be fertile. Wednesday''s egg will almost certainly be fertile. Note that this is after a mating, not just after they are put together. A rooster does not necessarily mate with each and every hen every day.

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