Відтінки шкаралупи бувають різні, так кури порід араукана і амераукана несуть блакитні і оливкові яйця, а породи еггерс олив — бірюзові і навіть зелені
<div class="table-of-contents open"><!--noindex--><div class="table-of-contents__header"><span class="table-of-contents__hide js-table-of-contents-hide">Contents</span></div><ol class="table-of-contents__list js-table-of-contents-list">
<li class="level-2"><a href="#the-older-the-hen-the-larger-the-eggs-she">The older the hen, the larger the eggs she lays. Does this mean such eggs are better?</a></li><li class="level-1"><a href="#what-determines-eggshell-color">What Determines Eggshell Color</a></li><li class="level-2"><a href="#1-breed">1. Breed</a></li><li class="level-2"><a href="#2-hen-s-age">2. Hen&#8217;s Age</a></li><li class="level-2"><a href="#3-living-conditions">3. Living Conditions</a></li><li class="level-1"><a href="#how-to-choose-eggs-properly">How to Choose Eggs Properly</a></li></ol><!--/noindex--></div><h3 id="the-older-the-hen-the-larger-the-eggs-she">The older the hen, the larger the eggs she lays. Does this mean such eggs are better?</h3>
<p>According to data from the International Egg Commission (IEC), residents of Iran and <a href="https://mandry.club/en/countries/finland/">Finland</a>, for example, prefer white-shelled eggs, while those in Austria, <a href="https://mandry.club/en/countries/czech-republic/">Czech Republic</a>, and <a href="https://mandry.club/en/countries/hungary/">Hungary</a> favor brown ones. But regardless of color, chicken eggs rank among the top 10 healthiest foods for humans. So, what determines shell color, and which eggs are more nutritious?</p>
<h2 id="what-determines-eggshell-color">What Determines Eggshell Color</h2>
<figure id="attachment_24975" aria-describedby="caption-attachment-24975" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2025/06/3-hens.webp"><img class="wp-image-24975 size-medium" src="https://mandry.club/wp-content/uploads/2025/06/3-hens-750x424.webp" alt="Factors influencing eggshell color in chickens" width="750" height="424" /></a><figcaption id="caption-attachment-24975" class="wp-caption-text">The shade of egg color depends on the age, individual traits, health, and living conditions of laying hens.</figcaption></figure>
<h3 id="1-breed">1. Breed</h3>
<p>In stores, we&#8217;re used to seeing white and brown chicken eggs, but shell color is actually more diverse. Breeds like Marans and Welsummer lay reddish-brown eggs, while Araucana and Ameraucana chickens produce blue and olive-colored eggs. The Eggers Olive breed even lays turquoise and green eggs. Shell color is determined by the concentration and combination of two pigments—protoporphyrin and biliverdin—and does not affect nutritional value.</p>
<figure id="attachment_24976" aria-describedby="caption-attachment-24976" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2025/06/7-chicken-eggs.webp"><img class="wp-image-24976 size-medium" src="https://mandry.club/wp-content/uploads/2025/06/7-chicken-eggs-750x424.webp" alt="Different colored chicken eggs from various breeds" width="750" height="424" /></a><figcaption id="caption-attachment-24976" class="wp-caption-text">Shell shades vary widely—Araucana and Ameraucana chickens lay blue and olive eggs, while Eggers Olive breeds produce turquoise and even green eggs.</figcaption></figure>
<h3 id="2-hen-s-age">2. Hen&#8217;s Age</h3>
<p>The shade of the shell depends on the hen&#8217;s age, individual characteristics, health, and living conditions.</p>
<p>Older hens lay larger eggs, but the increase in size is mainly due to more egg white, while the yolk size remains the same. The shell mass stays nearly unchanged because the shell gland&#8217;s productivity doesn&#8217;t increase. As a result, these eggs are not only bigger but also lighter in color. Younger hens produce eggs with better taste and nutritional value.</p>
<figure id="attachment_24977" aria-describedby="caption-attachment-24977" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2025/06/3-multicolored-chickens.webp"><img class="wp-image-24977 size-medium" src="https://mandry.club/wp-content/uploads/2025/06/3-multicolored-chickens-750x424.webp" alt="Multicolored chickens and their egg variations" width="750" height="424" /></a><figcaption id="caption-attachment-24977" class="wp-caption-text">Of course, not only the eggs differ—chicks and adult chickens also vary in appearance.</figcaption></figure>
<h3 id="3-living-conditions">3. Living Conditions</h3>
<p>Besides age, shell color intensity is affected by hyperthermia (overheating) when air temperatures exceed +26–28 °C (+79–82 °F).</p>
<p>Other factors include technological stressors like sudden light flashes, loud noises, poor air quality, and irregular feeding or watering. Feed poisoning, calcium deficiency (from minerals like limestone, chalk, or shells), and viral diseases also play a role. Under these conditions, shells become lighter, thinner, and less nutritious, with watery egg whites.</p>
<h2 id="how-to-choose-eggs-properly">How to Choose Eggs Properly</h2>
<p>Shell color intensity is influenced by hyperthermia and the hen&#8217;s age, while the base color depends on the breed.<br />
When buying eggs, prioritize freshness—they should be stored no longer than 25 days from collection at temperatures between 0 °C and +20 °C (32 °F to 68 °F).</p>
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