What causes PORUS Egg shells?

Discussion in 'Chicken Behaviors and Egglaying' started by Farmer Kitty, May 22, 2008.

  1. Farmer Kitty

    Farmer Kitty Flock Mistress

    Sep 18, 2007
    Wisconsin
    What is the cause of porus eggs shells?
     
  2. NoSpringChick

    NoSpringChick Chillin' With My Peeps

    325
    1
    141
    Apr 15, 2008
    SE PA
    I was wondering that myself...I wonder if it has something to do with the diet?
     
  3. Farmer Kitty

    Farmer Kitty Flock Mistress

    Sep 18, 2007
    Wisconsin
    Anyone? I was wondering about genetics or stress?
     
  4. coopist

    coopist Chillin' With My Peeps

    295
    1
    131
    Jan 2, 2008
    Midwest U.S.
    1. Inheritance/genetics
    2. Lack of sufficient calcium, phosphorus, manganese or vitamin D3
    3. Vitamin D2 mistakenly substituted for D3
    4. Excess phosphorus consumption, especially by older hens
    5. Ingestion of sulfanilamide (sulfa drugs)
    6. Disease: Newcastle disease, infectious bronchitis, avian influenza, Egg Drop Syndrome 76
    7. Hens exposed to temperature over 85-90°F
    8. Age of hens: incidence higher with older hens
    9. Premature laying of the egg

    University of Florida Extension

    http://edis.ifas.ufl.edu/PS020#TABLE_2
     
  5. Farmer Kitty

    Farmer Kitty Flock Mistress

    Sep 18, 2007
    Wisconsin
    Quote:Thankyou, coopist! Now all I have to do is figure out which applies.
    1. Hatchery chicks-no clue on the genetics.
    2, 3, 4. Get fed a complete layer ration with treats limited so I think I can rule these out.
    5. I haven't treated them with anything and they are in their coop and run so they couldn't have gotten into anything.
    6. Not familiar with all these diseases so I'll have to brush up on them.
    7. We have trouble getting temps in the 70's.
    8. Their just one year old. May 16th!
    9. It would have to apply to the majority on a regular basis. I doubt it.
     
    Last edited: May 23, 2008
  6. Wolf-Kim

    Wolf-Kim Chillin' With My Peeps

    3,832
    17
    221
    Jan 25, 2008
    Have you tried mixing a little egg-shell or oyster shell into their food? My hens will lay porous shells every now and then, but I just beef up their calcium and it seems to take care of the issue...

    -Kim
     
  7. Farmer Kitty

    Farmer Kitty Flock Mistress

    Sep 18, 2007
    Wisconsin
    I feed back the egg shells. Maybe I will have to see about getting some Ostershells too. Their shells are nice and thick and strong. Mom has told me to quit feeding whatever I'm feeding that makes them so hard to crack! [​IMG]
     
  8. mama shane

    mama shane New Egg

    6
    0
    9
    Feb 19, 2017
    Gladeville, TN
    I occasionally have porus shells with my girls too. I have found it's the all natural, non-gmo feed I get from the Amish. It doesn't have enough calcium and I have to supplement a bit of ground oyster shell with their feed.
     

BackYard Chickens is proudly sponsored by