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What are the odds of getting a double-yolk egg? - ABC listen
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class="DetailHeader_meta__43Jgi"><h1 class="Typography_base__sj2RP Heading_heading__VGa5B DetailHeader_title__wOSrq Typography_sizeMobile32__6JQ9G Typography_sizeDesktop48__7hlaA Typography_lineHeightMobile40__S3XDe Typography_lineHeightDesktop64__D04iD Typography_marginBottomMobileDefault__HbZFN Typography_marginBottomDesktopDefault__mvZlS Typography_black__9qnZ1 Typography_colourInherit__dfnUx Typography_normalise__u5o1s" data-component="Heading">What are the odds of getting a double-yolk egg?</h1><span class="Typography_base__sj2RP Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Text"><span class="Typography_base__sj2RP Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Text"><span class="Typography_base__sj2RP Byline_byline__FSQs9 Typography_sizeMobile12__w_FPC Typography_lineHeightMobile24__crkfh Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Byline"><span class="Typography_base__sj2RP Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Text"><div><p><strong>Dr Karl Kruszelnicki</strong></p></div></span></span></span><div class="DetailHeader_publishedDate__Hup8D" data-component="Dateline"><span class="Typography_base__sj2RP Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Text">Posted<!-- --> </span><time class="Typography_base__sj2RP DynamicTimestamp_displayDate__Y3t35 Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx 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class="Figure_figure__NnqTc ContentAlignment_marginBottom__4H_6E ContentAlignment_overflowAuto__c1_IL ContentAlignment_outdentDesktop__ijbiK" role="group" data-print="inline-media" aria-labelledby="7625394" data-component="Figure" data-uri="coremedia://image/7625394"><div class="ContentImage_ratio__0yYeG"><div class="AspectRatio_container__FC_XH" style="--aspect-ratio:1.5" data-component="AspectRatioContainer"><img alt="" class="Image_image__5tFYM ContentImage_image__DQ_cq" sizes="100vw" src="https://live-production.wcms.abc-cdn.net.au/1479aedcc60e657a82abdedf7c4ea82d?impolicy=wcms_crop_resize&cropH=998&cropW=1495&xPos=2&yPos=0&width=862&height=575" loading="lazy" data-component="Image" data-lazy="true"/></div></div><figcaption class="Typography_base__sj2RP Figure_figcaption___vGe0 Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" id="7625394" data-component="Figure__figcaption"> <!-- -->Don't buy a lottery ticket just yet.<cite class="Typography_base__sj2RP Figure_citation__l84Hq Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Figure__cite">(<span class="Typography_base__sj2RP image_byline__BnhC7 Typography_sizeMobile12__w_FPC Typography_lineHeightMobile24__crkfh Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Byline"><span class="Typography_base__sj2RP Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Text"><span>Getty Images</span></span></span>)</cite></figcaption></figure><em>If you buy a lottery ticket every time you get a double-yolk egg because you're having a lucky streak you'll be disappointed to learn it's not as uncommon as we've made to believe, as <strong>Dr Karl Kruszelnicki </strong>explains.</em></div><p>Every now and then, slightly bleary-eyed people get a surprise while they're preparing breakfast—they come across a double-yolk egg. But then it can happen with the next egg that is cracked from the carton—and sometimes the third egg, and even the fourth egg! Surely this is impossible? </p><p><div class="EmphasisedText_emphasisedText__h0tpv ContentAlignment_marginBottom__4H_6E ContentAlignment_overflowAuto__c1_IL" data-component="EmphasisedText" data-uri="coremedia://teaser/7625334"><p>When you average out the number of double-yolk eggs from chickens of all ages, about one out of every 1,000 eggs has two yolks.</p></div>Not quite.</p><p>What is the chance of getting just the one double-yolk egg? Turns out to be about one in 1,000. And the chances of four double-yolk eggs in a row? Under the right circumstances, the chances can be surprisingly high.</p><p>Let's start with the basics.</p><p>In a hen, the name of the tube that runs from the ovary to the outside world is called the 'oviduct'.</p><p>Five regions of the oviduct are involved when a chicken lays an egg.</p><p>The first region (the infundibulum) is where the egg yolk lands, after leaving the ovary. It spends about 20 minutes here.</p><p>In region two (the magnum) the yolk is coated with about half of its white albumen. This takes about three hours. In region three (the isthmus), more albumen is added—and also, the inner and outer shell membranes are deposited. This process takes about one hour.</p><p>The eggshell is added in region four (the uterus). This takes a long time—about 19 hours.</p><p>The egg leaves through the fifth region, the cloaca. While female humans have separate openings for urine, faeces and copulation, female chickens have only one—the cloaca. The uterus virtually turns itself inside out to deliver a sparkling clean egg, free of faeces.</p><p>You can get a double-yolk when the ovary is too 'enthusiastic'. The ovary produces one yolk, and instead of waiting for the normal period of one day, it quickly produces another yolk. The two yolks then move together through the rest of the process, and get laid as a single egg—with two yolks inside.</p><p>Double-yolks happen more frequently in young chickens, when they're in their early days of egg-production—20-28 weeks old. These young chickens (still getting the hang of being a grown-up hen) produce a double-yolk egg once every 100 lays.</p><p>But when you average out the number of double-yolk eggs from chickens of all ages, about one out of every 1,000 eggs has two yolks. So, ignoring all other factors, the chances of getting four double-yolk eggs in a row from a single carton should be (1/1,000) x (1/1,000) x (1/1,000) x (1/1,000), or one in every trillion.</p><p>But there are other factors—lots of them.</p><p>First, double-yolk eggs are usually larger than single-yolk eggs. Eggs are usually sold in the sizes of small, medium and large. So if you find a double-yolk egg in a carton of large eggs—the chances are higher than normal that another double-yolk egg could be found.</p><p>Second, the eggs in any given cardboard carton are most likely to have come from the same flock. Chickens in the same flock are usually the same age. Again, this increases your chances of getting a second double-yolk egg, if you've already picked the first one.</p><blockquote class="Blockquote_blockquote___uQHO ContentAlignment_marginBottom__4H_6E ContentAlignment_overflowAuto__c1_IL ContentAlignment_outdent__EnoMV" data-component="Blockquote"><p><strong>Did you know <em>Great Moments In Science</em> is also a podcast? Subscribe on <a class="Link_link__5eL5m ScreenReaderOnly_srLinkHint__OysWz Link_showVisited__C1Fea Link_showFocus__ALyv2" href="https://itunes.apple.com/au/podcast/great-moments-in-science-dr/id1115543715?mt=2" data-component="Link">iTunes</a>, <a class="Link_link__5eL5m ScreenReaderOnly_srLinkHint__OysWz Link_showVisited__C1Fea Link_showFocus__ALyv2" href="https://radio.abc.net.au/help/apps" data-component="Link">ABC Radio</a> or your favourite <a class="Link_link__5eL5m ScreenReaderOnly_srLinkHint__OysWz Link_showVisited__C1Fea Link_showFocus__ALyv2" href="http://www.abc.net.au/radionational/feed/7417248/podcast.xml" data-component="Link">podcast app</a>.</strong></p></blockquote><p>In the UK, Marks & Spencer have increased the odds to 100 per cent. In 2015, they launched boxes of six extra-large eggs—each one guaranteed to have a double-yolk.</p><p>They started with young chickens, and then 'candled' their extra-large eggs. 'Candling' is a technique usually done in a darkened room. A bright light is shone through the big end of the egg. Candling can detect blood in the whites, cracked shells—and two yolks. The cost was high—you had to shell out nearly three quid for the half-dozen eggs.</p><p>But can the two yolks turn into two chickens? Unfortunately, they rarely hatch.</p><p>In a fertilised egg, the unhatched chick has to rotate around, so it gets its head up to where the air cell is (the round end). Then, under normal circumstances, the baby chick will peck its way out.</p><p>But if there are two chicks inside, they will almost invariably fight each other. Neither of them will be able to get to the air cell, so they both die.</p><p>However, on the sunny side, there have been a few very rare cases where the egg has been very carefully opened at exactly the right time (in a kind of mini-Caesarian), and two chicks have survived from a double-yolk egg.</p><p>Though, given our appetites for chicken, that sort of celebrity status ain't gonna keep those chickens out of the frying pan.</p></div><div class="DetailLayout_publishedDate__3TCnq" data-component="Dateline"><span class="Typography_base__sj2RP Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" data-component="Text">Posted<!-- --> </span><time class="Typography_base__sj2RP DynamicTimestamp_displayDate__Y3t35 Typography_sizeMobile12__w_FPC Typography_lineHeightMobile20___U7Vr Typography_regular__WeIG6 Typography_colourInherit__dfnUx Typography_letterSpacedSm__V8kil" 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now and then, slightly bleary-eyed people get a surprise while they're preparing breakfast—they come across a double-yolk egg. But then it can happen with the next egg that is cracked from the carton—and sometimes the third egg, and even the fourth egg! Surely this is impossible? "}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"tagname","key":"pullquote","props":{"renderPullquotesAsEmphasisedText":true,"contentURI":"coremedia://teaser/7625334"},"children":[{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"When you average out the number of double-yolk eggs from chickens of all ages, about one out of every 1,000 eggs has two yolks."}]}]},{"type":"text","content":"Not quite."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"What is the chance of getting just the one double-yolk egg? Turns out to be about one in 1,000. And the chances of four double-yolk eggs in a row? Under the right circumstances, the chances can be surprisingly high."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"Let's start with the basics."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"In a hen, the name of the tube that runs from the ovary to the outside world is called the 'oviduct'."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"Five regions of the oviduct are involved when a chicken lays an egg."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"The first region (the infundibulum) is where the egg yolk lands, after leaving the ovary. It spends about 20 minutes here."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"In region two (the magnum) the yolk is coated with about half of its white albumen. This takes about three hours. In region three (the isthmus), more albumen is added—and also, the inner and outer shell membranes are deposited. This process takes about one hour."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"The eggshell is added in region four (the uterus). This takes a long time—about 19 hours."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"The egg leaves through the fifth region, the cloaca. While female humans have separate openings for urine, faeces and copulation, female chickens have only one—the cloaca. The uterus virtually turns itself inside out to deliver a sparkling clean egg, free of faeces."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"You can get a double-yolk when the ovary is too 'enthusiastic'. The ovary produces one yolk, and instead of waiting for the normal period of one day, it quickly produces another yolk. The two yolks then move together through the rest of the process, and get laid as a single egg—with two yolks inside."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"Double-yolks happen more frequently in young chickens, when they're in their early days of egg-production—20-28 weeks old. These young chickens (still getting the hang of being a grown-up hen) produce a double-yolk egg once every 100 lays."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"But when you average out the number of double-yolk eggs from chickens of all ages, about one out of every 1,000 eggs has two yolks. So, ignoring all other factors, the chances of getting four double-yolk eggs in a row from a single carton should be (1/1,000) x (1/1,000) x (1/1,000) x (1/1,000), or one in every trillion."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"But there are other factors—lots of them."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"First, double-yolk eggs are usually larger than single-yolk eggs. Eggs are usually sold in the sizes of small, medium and large. So if you find a double-yolk egg in a carton of large eggs—the chances are higher than normal that another double-yolk egg could be found."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"Second, the eggs in any given cardboard carton are most likely to have come from the same flock. Chickens in the same flock are usually the same age. Again, this increases your chances of getting a second double-yolk egg, if you've already picked the first one."}]},{"type":"tagname","key":"blockquote","props":{"alignment":"outdent"},"children":[{"type":"tagname","key":"p","props":{},"children":[{"type":"tagname","key":"strong","props":{},"children":[{"type":"text","content":"Did you know "},{"type":"tagname","key":"em","props":{},"children":[{"type":"text","content":"Great Moments In Science"}]},{"type":"text","content":" is also a podcast? Subscribe on "},{"type":"tagname","key":"a","props":{"href":"https://itunes.apple.com/au/podcast/great-moments-in-science-dr/id1115543715?mt=2"},"children":[{"type":"text","content":"iTunes"}]},{"type":"text","content":", "},{"type":"tagname","key":"a","props":{"href":"https://radio.abc.net.au/help/apps"},"children":[{"type":"text","content":"ABC Radio"}]},{"type":"text","content":" or your favourite "},{"type":"tagname","key":"a","props":{"href":"http://www.abc.net.au/radionational/feed/7417248/podcast.xml"},"children":[{"type":"text","content":"podcast app"}]},{"type":"text","content":"."}]}]}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"In the UK, Marks \u0026 Spencer have increased the odds to 100 per cent. In 2015, they launched boxes of six extra-large eggs—each one guaranteed to have a double-yolk."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"They started with young chickens, and then 'candled' their extra-large eggs. 'Candling' is a technique usually done in a darkened room. A bright light is shone through the big end of the egg. Candling can detect blood in the whites, cracked shells—and two yolks. The cost was high—you had to shell out nearly three quid for the half-dozen eggs."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"But can the two yolks turn into two chickens? Unfortunately, they rarely hatch."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"In a fertilised egg, the unhatched chick has to rotate around, so it gets its head up to where the air cell is (the round end). Then, under normal circumstances, the baby chick will peck its way out."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"But if there are two chicks inside, they will almost invariably fight each other. Neither of them will be able to get to the air cell, so they both die."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"However, on the sunny side, there have been a few very rare cases where the egg has been very carefully opened at exactly the right time (in a kind of mini-Caesarian), and two chicks have survived from a double-yolk egg."}]},{"type":"tagname","key":"p","props":{},"children":[{"type":"text","content":"Though, given our appetites for chicken, that sort of celebrity status ain't gonna keep those chickens out of the frying pan."}]}]}},"synopsisAlt":"If you buy a lottery ticket every time you get a double-yolk egg because you're having a lucky streak you'll be disappointed to learn it's not as uncommon as we've made to believe, as Dr Karl Kruszelnicki explains.","titleAlt":"What are the odds of getting a double-yolk egg?","hidePublicationDateCMS":null,"allowMediaDownload":false},"bottom":[{"key":"RelatedStories","component":"RelatedStories","componentProps":{"hasBorders":true,"cardClassName":false,"className":false,"items":[],"analytics":{"uri":"coremedia://article/7625330","moduleUri":"app://module/related-stories","contentSource":"coremedia","contentType":"collection","id":"7625330","title":{"title":"related-stories"},"items":[]},"heading":"Related"}}]},"newsletterToasterPrepared":null,"productName":"listen","isArticle":true},"__N_SSP":true},"page":"/[productSlug]/programs/[productPageSlug]/[...programPagePath]","query":{"section":"science","productSlug":"listen","productPageSlug":"greatmomentsinscience","programPagePath":["features","what-are-the-odds-of-getting-a-double-yolk-egg","7625330"]},"buildId":"ceG8_cNDimqXPbEgc6qh5","isFallback":false,"isExperimentalCompile":false,"gssp":true,"scriptLoader":[]}</script></body></html>