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Rodents and wild birds can carry several diseases that can infect both you and your chickens. Never feed your chickens outside and keep all feed in a secure place with no access for wild birds and rodents. Keep grass and weeds around your chicken house and run cut down, as long vegetation provides the perfect place for vermin to hide.

Change the bedding in your nest boxes weekly to ensure that the eggs are laid onto a clean surface. Always ensure you keep your own hands clean and wash them after handling the chickens or collecting eggs each day.

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We recommend Intersoft N for this purpose. Never be tempted to wash dirty eggs as this will spread the bacteria around the shell.

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  • Even clean eggs should not be washed as they are coated in a waterproof cuticle which protects them from bacteria entering in through the tiny pores on the surface of the egg shell. Washing eggs removes this protective cuticle. Ideally, eggs should be stored in a cool place such as your larder and not in your fridge. Always use eggs within three weeks of being laid. You can use a pencil to mark the date once they have been laid.

    We frequently get calls from concerned owners about the risks of getting Salmonella from their chickens and eggs. Salmonella is a bacteria which can infect both animals and man. There are many species of Salmonella, all of which have a preffered animal to infect, for example, Salmonell Dublin prefers to live in cattle.

    Not all Salmonella cause illness and not all Salmonella which causes disease in one animal will go on to cause disease in another. But whilst most Salmonella nellaspecies prefer to infect a particular type of animal they can infect other animals and humans. For example, Salmonella nella Enteritidis prefers to infect chickens but causes no problems for them.

    However, it can occasionally go on to infect people causing vomiting and diarrhoea. Salmonella can cause vomiting and diarrhoea in people and in extreme cases, causes blood poisoning. In animals it can cause diarrhoea and blood poisoning.

    Egg Yolks - what makes them yellow?

    Yes, it is indeed possible for Salmonella to cause disease in chickens; however this is extremely rare. There are two main species involved: Pullorum can cause blood poisoning, diarrhoea and sudden death in young chicks under three weeks of age. Gallinarum can cause sudden death, diarrhoea and difficulty breathing.

    Whilst it is not particularly common , Salmonella can cause illness in people, especially if they are vulnerable, such as people with HIV and pregnant women.


    There are two species of Salmonella which chickens can carry which can cause illness in people S. These species do not cause illness in chickens but can in extreme cases infect people. This caused a plummet in egg sales and subsequently the egg industry began to routinely test all egg and meat producing chickens regularly. Most laying flocks are now vaccinated for these strains of Salmonella. Most people contract the bacteria from not washing their hands properly after handling their birds or after handling raw meat.

    Rodents and wild birds are potential carriers so ensure you control rats with bait stations and keep feed in secure containers.

    Pale Eggs - Why Egg Shell Colour Can Change

    Chicken Vet Digesti-Health can be given daily in feed to help exclude Salmonella as it binds to the bacteria stopping it attaching to your chickens intestine. There is no real need to vaccinate your birds provided that you wash your hands properly after handling your chickens and that you cook your food properly. If you do wish to vaccinate your chickens then it will involve giving your birds two injections 4 weeks apart followed by an annual booster. The problem is that vaccination only protects against Enteritidis and Typhimurium and not all the other potential strains out there.


    You can certainly test your birds for Salmonella with a faecal sample. Purchase testing kits in our shop but clearly state you require testing for Salmonella. However if you sell eggs to someone who will sell them on, such as a shopkeeper, hotelier etc, you need to register with the Egg Marketing Inspectorate. Our Chicken Coop is full of great products to keep your chickens chipper. Visit our Useful Links page for advice. Even though the eggshell contains traces of pigment, its contribution to the intensity of brown color is negligible compared to that of the cuticle.

    Help! My Egg Yolks Are Freakishly White

    Since the majority of the pigment is localized in the cuticle, anything that interferes with the ability of the epithelial cells in the shell gland to synthesize the cuticle will affect the intensity of eggshell pigmentation. This is especially true during the final 3 to 4 hours of shell deposition since it is during this time in the egg-laying cycle that cuticle synthesis and accumulation occur most rapidly.

    Find out if your Eggs Came from a Sick or Healthy Chicken

    Stressors in poultry flocks, such as high cage density, handling, loud noises, etc. This hormone, when released into the blood, is responsible for causing a delay in oviposition and the cessation of shell gland cuticle formation. The above stressors, which result in hen nervousness and fear, can cause pale eggshells to be produced.

    The paleness is often the result of amorphous calcium carbonate deposited on top of a preexisting fully formed cuticle or of an incomplete cuticle caused by premature arrest of cuticle formation. Brown-shelled birds, especially broiler breeders, housed in experimental floor pens for research purposes often become fearful each time the pen is entered for such things as egg collection, vaccination, uniformity, and frame and fleshing measurements. When this occurs, production of pale-shelled eggs should be expected, especially if the fearfulness occurs during the last 3 to 4 hours of the egg-laying cycle when the cuticle formation is interrupted.

    In fact, the relationship between stress and the production of pale eggs by laying hens is so great that researchers have suggested that loss of shell pigment may provide a basis for a noninvasive method of assessing stress in hens. As the brown egg-type bird ages, there is a corresponding decrease in eggshell pigment intensity. The exact reason for this is unknown. It is possibly due to the same quantity of pigment being dispersed over a larger surface area of shell as egg size increases with bird age or less pigment synthesis.

    As the hen ages it is normal for the tapered end of the egg to contain less pigment than the rounded end. Stress-related egg retention in the shell gland and subsequent amorphous calcium carbonate deposition on the shell surface have been identified as a major cause of pale eggs in older hens. A rapid decline in shell pigmentation is common following the ingestion of certain drugs by the hen, such as the sulfonamides.

    The coccidiostat Nicarbazin, administered to hens at a dose of 5 mg per day, can result in the production of pale eggs within 24 hours. Higher doses can lead to complete depigmentation of the eggshell cuticle.

    Eggshell Quality

    Viral diseases, such as Newcastle and infectious bronchitis, affect egg production in poultry. These viruses have a specific affinity for the mucus membranes of the respiratory and reproductive tracts. Because the virus directly infects and damages the reproductive tract, the signs of disease are manifested indirectly in the product of the tract, the egg. Thus, total egg numbers decline and eggshells become thinner and abnormally pale and have irregular contour. Internal quality is also adversely affected watery whites. These egg production and quality problems can persist for extended periods.

    Most eggshell pigments are located in the cuticle and outer portion of the calcified eggshell. Premature arrest of cuticle formation or release of stress-related hormones epinephrine will result in the production of pale brown-shelled eggs. Age of the bird, use of certain chemotherapeutic agents, and disease also can affect the intensity of pigmentation. No one factor, especially infectious bronchitis, should be diagnosed as the cause of the reduced pigmentation of eggshells until all possible differentials that may affect pigmentation have been considered.

    The Avian Egg-Chemistry and Biology. Individual variation and relationships with age, fearfulness, oviposition interval and stress. Mineral composition of uterine fluid and rate of protoporphyrin deposition.