{"id":3251,"date":"2026-08-04T20:14:23","date_gmt":"2026-08-04T20:14:23","guid":{"rendered":"https:\/\/www.rattech.com\/hvor-gammel-kan-en-rotte-blive\/"},"modified":"2026-08-04T20:14:25","modified_gmt":"2026-08-04T20:14:25","slug":"hvor-gammel-kan-en-rotte-blive","status":"publish","type":"post","link":"https:\/\/www.rattech.com\/pl\/hvor-gammel-kan-en-rotte-blive\/","title":{"rendered":"Hvor gammel kan en rotte blive? Alder og levetid hos rotter"},"content":{"rendered":"<style id=\"rt-blog-enrich\">:root{ --rt-navy:#1D3557;--rt-navy-d:#143852;--rt-navy-ink:#0f2740; --rt-ink:#1e293b;--rt-muted:#5b6b80; --rt-orange:#F28023;--rt-orange-d:#d76d13;--rt-peach:#FFBC7D; --rt-bg:#F4F6FA;--rt-bg2:#eaeef6;--rt-paper:#FBFCFE;--rt-line:#DDE4EE;--rt-line-d:#C7D1E0; --rt-font:'Montserrat',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif; --rt-body:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif; --rt-sh-sm:0 2px 10px rgba(15,39,64,.06); --rt-sh:0 12px 30px rgba(15,39,64,.10); --rt-sh-lg:0 26px 60px rgba(15,39,64,.16); --rt-dots:radial-gradient(rgba(29,53,87,.055) 1.1px,transparent 1.1px); } .elementor-widget-theme-post-title{position:relative;} .elementor-widget-theme-post-title::before{ content:\"\";display:block;width:58px;height:5px;border-radius:3px; background:linear-gradient(90deg,var(--rt-orange),var(--rt-peach));margin:0 0 .8rem;} .elementor-widget-theme-post-title .elementor-heading-title{ font-family:var(--rt-font)!important;font-weight:800;color:var(--rt-navy-ink); 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margin:0 0 1em;overflow:hidden;box-shadow:var(--rt-sh-sm);} .rt-main tbody td{display:flex;justify-content:space-between;gap:1.1em;align-items:baseline; text-align:right;padding:.65em .95em;border-top:1px solid var(--rt-bg2);} .rt-main tbody td::before{content:attr(data-label);font-family:var(--rt-font);font-weight:700; color:var(--rt-navy);text-align:left;flex:0 0 42%;font-size:.86rem;} .rt-main tbody td:first-child{display:block;text-align:left; background:linear-gradient(180deg,var(--rt-navy),var(--rt-navy-d));color:#fff;font-family:var(--rt-font); font-weight:700;border-top:none;padding:.75em .95em;} .rt-main tbody td:first-child::before{content:none;} }\n<\/style>\n<div class=\"rt-article\">\n<div class=\"rt-main\">\n<p><strong>En brun rotte kan biologisk blive 2-3 \u00e5r gammel, men i naturen lever den i gennemsnit kun omkring 4 m\u00e5neder. Det oplyser specialdyrl\u00e6ge og forsker Aage Kristian Olsen Alstrup fra Aarhus Universitet til Videnskab.dk (2021). Kun rotter under beskyttede forhold n\u00e6rmer sig maksimum &#8211; vilde rotter i danske kloakker og haver d\u00f8r typisk l\u00e6nge f\u00f8r f\u00f8rste f\u00f8dselsdag.<\/strong><\/p>\n<div class=\"rt-kort\">\n<h2>Kort fortalt om rottens alder<\/h2>\n<ul>\n<li>Biologisk maksimum: 2-3 \u00e5r (Videnskab.dk, 2021, med Aage Kristian Olsen Alstrup, Aarhus Universitet).<\/li>\n<li>Gennemsnitlig levetid i naturen: omkring 4 m\u00e5neder (samme kilde).<\/li>\n<li>K\u00f8nsmoden efter cirka 3 m\u00e5neder ved en v\u00e6gt p\u00e5 cirka 150 gram.<\/li>\n<li>Formering: 3-7 kuld om \u00e5ret, 4-12 unger per kuld, dr\u00e6gtighed 21-22 dage.<\/li>\n<li>Kort liv kombineret med hurtig formering betyder, at en bestand genopbygges p\u00e5 uger &#8211; ikke \u00e5r. Derfor holder en engangsindsats sj\u00e6ldent.<\/li>\n<\/ul>\n<\/div>\n<h2>Hvor l\u00e6nge lever en rotte i naturen?<\/h2>\n<p>En vild brun rotte lever typisk kun cirka 4 m\u00e5neder, selv om arten biologisk kan n\u00e5 2-3 \u00e5r under beskyttede forhold. Tallene stammer fra Videnskab.dk (2021), der bygger p\u00e5 oplysninger fra specialdyrl\u00e6ge Aage Kristian Olsen Alstrup, Aarhus Universitet. Gennemsnittet tr\u00e6kkes voldsomt ned af, at mange unger d\u00f8r i deres f\u00f8rste leveuger.<\/p>\n<p>Forskellen mellem gennemsnit og maksimum er central, hvis du pr\u00f8ver at forst\u00e5 et rotteproblem p\u00e5 din grund. Den rotte, du ser l\u00f8be langs et fundament, er statistisk set et ungt dyr p\u00e5 f\u00e5 m\u00e5neder &#8211; ikke et gammelt dyr. Til geng\u00e6ld er den efter cirka tre m\u00e5neder allerede gammel nok til selv at f\u00e5 unger.<\/p>\n<h2>Hvorfor bliver vilde rotter sj\u00e6ldent gamle?<\/h2>\n<p>Vilde rotter d\u00f8r af rovdyr, trafik, sult, kulde, sygdom og bek\u00e6mpelse l\u00e6nge f\u00f8r det biologiske maksimum p\u00e5 2-3 \u00e5r. Hvor stor en rolle rovdyr spiller, illustreres af Aarhus Universitets DCE-rapport nr. 788 (2010): der blev fundet antikoagulant rottegift i 84-100 procent af de unders\u00f8gte danske rovfugle, ugler og sm\u00e5 rovpattedyr &#8211; stoffer, dyrene kun kan have f\u00e5et i sig gennem de gnavere, de \u00e6der.<\/p>\n<p>Kulde og f\u00f8demangel er den anden store faktor, og is\u00e6r unge dyr klarer sig d\u00e5rligt gennem en h\u00e5rd vinter. Samtidig er antallet af rotteanmeldelser i Danmark steget markant: Milj\u00f8styrelsen registrerede 197.639 rotteanmeldelser i 2025 mod 141.854 i 2023 &#8211; cirka 40 procent flere p\u00e5 to \u00e5r (tal fra Milj\u00f8styrelsen, offentliggjort juli 2026). Flere anmeldelser betyder ikke, at den enkelte rotte lever l\u00e6ngere, men at flere dyr n\u00e5r frem til yngledygtig alder.<\/p>\n<h2>Hvad sker der i rottens liv m\u00e5ned for m\u00e5ned?<\/h2>\n<p>Rottens livsforl\u00f8b er komprimeret: fra blind unge til k\u00f8nsmoden voksen p\u00e5 cirka tre m\u00e5neder, og fra k\u00f8nsmoden til den gennemsnitlige levetid i naturen p\u00e5 yderligere cirka en m\u00e5ned. Tabellen nedenfor sammenstiller de biologiske milep\u00e6le med det, du reelt kan observere p\u00e5 en ejendom &#8211; og hvad hvert stadie betyder for bek\u00e6mpelsen.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Alder<\/th>\n<th scope=\"col\">Stadie<\/th>\n<th scope=\"col\">Kendetegn<\/th>\n<th scope=\"col\">Betydning for bek\u00e6mpelsen<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0-3 uger<\/td>\n<td>Unge i reden<\/td>\n<td>F\u00f8dt blind og h\u00e5rl\u00f8s, forlader ikke reden<\/td>\n<td>Ses aldrig &#8211; kun moderdyret bev\u00e6ger sig ud efter foder<\/td>\n<\/tr>\n<tr>\n<td>3-8 uger<\/td>\n<td>Frav\u00e6nnet ungdyr<\/td>\n<td>Begynder at \u00e6de fast f\u00f8de og udforske<\/td>\n<td>Nye ekskrementer, gnav og lyde i etageadskillelser<\/td>\n<\/tr>\n<tr>\n<td>Ca. 3 m\u00e5neder<\/td>\n<td>K\u00f8nsmoden<\/td>\n<td>Cirka 150 gram<\/td>\n<td>Dyret kan nu selv f\u00e5 kuld &#8211; herfra vokser bestanden hurtigt<\/td>\n<\/tr>\n<tr>\n<td>Ca. 4 m\u00e5neder<\/td>\n<td>Gennemsnitlig levetid i naturen<\/td>\n<td>Fuldvoksen krop: hunner cirka 200 g, hanner cirka 250 g<\/td>\n<td>Mange dyr n\u00e5r ikke l\u00e6ngere &#8211; men nye rotter rykker ind, hvor sikringen er ut\u00e6t<\/td>\n<\/tr>\n<tr>\n<td>6-12 m\u00e5neder<\/td>\n<td>Erfaren voksen<\/td>\n<td>Ofte sky over for nye genstande p\u00e5 den vante rute<\/td>\n<td>Sv\u00e6rere at fange &#8211; f\u00e6lder skal st\u00e5 fremme i l\u00e6ngere tid<\/td>\n<\/tr>\n<tr>\n<td>2-3 \u00e5r<\/td>\n<td>Biologisk maksimum<\/td>\n<td>N\u00e5s stort set kun under beskyttede forhold<\/td>\n<td>Uden praktisk betydning for et almindeligt rotteproblem<\/td>\n<\/tr>\n<\/tbody>\n<\/table><figcaption class=\"wp-element-caption\">Rottens livsforl\u00f8b sammenholdt med tegn p\u00e5 ejendommen. Alders- og v\u00e6gtdata: Videnskab.dk (2021) med Aarhus Universitet. Sammenstilling og praksiskolonne: RatTech.<\/figcaption><\/figure>\n<h2>Hvor hurtigt formerer rotter sig p\u00e5 s\u00e5 kort tid?<\/h2>\n<p>Rotter kompenserer for det korte liv med meget hurtig formering: 3-7 kuld om \u00e5ret med 4-12 unger per kuld og en dr\u00e6gtighed p\u00e5 kun 21-22 dage, oplyser Videnskab.dk (2021). Med et midtersk\u00f8n p\u00e5 5 kuld \u00e1 8 unger svarer det til cirka 40 unger per hun per \u00e5r &#8211; og de af dem, der overlever, er selv k\u00f8nsmodne tre m\u00e5neder senere.<\/p>\n<p>Derfor kan Videnskab.dk (2021) ogs\u00e5 oplyse, at et enkelt par brune rotter under gunstige forhold kan blive til over 800 rotter p\u00e5 et enkelt \u00e5r. Regnestykket forklarer, hvorfor et rotteproblem sj\u00e6ldent &#8220;g\u00e5r over af sig selv&#8221;: tabet af d\u00f8de dyr erstattes hurtigere, end de d\u00f8r. Vil du s\u00e6tte tallene i perspektiv, har vi samlet et overblik over <a href=\"https:\/\/www.rattech.com\/hvor-mange-rotter-er-der-i-danmark\/\">hvor mange rotter der er i Danmark<\/a>.<\/p>\n<h2>Lever rotter l\u00e6ngere indend\u00f8rs end udend\u00f8rs?<\/h2>\n<p>Ja, alt tyder p\u00e5 det: rotter med adgang til en k\u00e6lder, en krybek\u00e6lder eller en varm teknikskakt undg\u00e5r netop de faktorer, der sl\u00e5r vilde rotter ihjel &#8211; frost, rovdyr og f\u00f8demangel. De n\u00e6rmer sig derfor artens biologiske maksimum p\u00e5 2-3 \u00e5r frem for gennemsnittet p\u00e5 cirka 4 m\u00e5neder, som Videnskab.dk (2021) angiver for dyr i det fri.<\/p>\n<p>Det er den praktiske grund til, at indend\u00f8rs forekomster skal tages alvorligt med det samme. En etableret indend\u00f8rs bestand f\u00e5r b\u00e5de bedre overlevelse og flere kuld end en udend\u00f8rs, og den udvider gerne redeomr\u00e5det ind i isolering og hulmure. Har du mistanke om det, kan du starte med vores gennemgang af tegnene p\u00e5 <a href=\"https:\/\/www.rattech.com\/rotter-i-kaelderen\/\">rotter i k\u00e6lderen<\/a> og af <a href=\"https:\/\/www.rattech.com\/rotte-spor\/\">de spor rotter efterlader<\/a>.<\/p>\n<h2>Forkorter rottegift rottens liv?<\/h2>\n<p>Ja, men langsomt &#8211; og med konsekvenser for andre dyr. Antikoagulanter virker f\u00f8rst efter dage, hvor rotten n\u00e5r at bev\u00e6ge sig og ofte d\u00f8r inde i en konstruktion. Aarhus Universitets DCE-rapport nr. 788 (2010) fandt antikoagulanter i 84-100 procent af de unders\u00f8gte rovfugle, ugler og sm\u00e5 rovpattedyr, og over 60 procent af fuglene havde to eller flere forskellige stoffer i kroppen.<\/p>\n<p>Dertil kommer resistens og skrappe regler. Milj\u00f8styrelsen driver en resistensstrategi, hvor enhver bek\u00e6mpelse med antikoagulanter skal starte med det svageste aktivstof, og hvor brugen skal stoppe straks, hvis der konstateres resistens. Samtidig er det kun R1-autoriserede rottebek\u00e6mpere, der m\u00e5 udl\u00e6gge rottegift hos private. Gift \u00e6ndrer alts\u00e5 ikke ved, at nye rotter rykker ind efter f\u00e5 uger, men den belaster f\u00f8dek\u00e6den imens.<\/p>\n<p>Den giftfrie tilgang l\u00f8ser det samme uden kemi. En digital f\u00e6lde afliver rotten mekanisk p\u00e5 et splitsekund, sender besked om fangsten og g\u00f8r sig selv klar til den n\u00e6ste. Der er ingen sekund\u00e6r forgiftning af ugler, r\u00e6ve eller katte, ingen resistens at tage h\u00f8jde for, og ingen d\u00f8d rotte, du skal lede efter bag en v\u00e6g. Det er princippet bag <a href=\"https:\/\/www.rattech.com\/product\/grundpakke\/\">RatTechs digitale rottef\u00e6lder i grundpakken<\/a>.<\/p>\n<h2>Hvordan holder du bestanden nede, n\u00e5r rotter formerer sig s\u00e5 hurtigt?<\/h2>\n<p>Fordi en vild rotte i gennemsnit kun lever cirka 4 m\u00e5neder, men er k\u00f8nsmoden allerede efter 3, skal indsatsen v\u00e6re vedvarende frem for en engangsaktion. Vores erfaring fra ejendomme p\u00e5 Sj\u00e6lland peger p\u00e5 tre ting, der skal spille sammen: luk adgangsvejene, hold permanent fangsttryk p\u00e5 de aktive ruter, og anmeld forekomsten til kommunen.<\/p>\n<ol>\n<li><strong>Find og luk adgangsvejene.<\/strong> Rotter kommer oftest op gennem defekte kloakker. En rottesp\u00e6rre i stikledningen og udbedring af brud lukker den hyppigste vej ind. Ved usikkerhed giver <a href=\"https:\/\/www.rattech.com\/product\/gennemgang-af-ejendom\/\">en gennemgang af ejendommen<\/a> et konkret billede af, hvor dyrene kommer ind.<\/li>\n<li><strong>Hold trykket permanent.<\/strong> F\u00e6lder, der st\u00e5r fremme og overv\u00e5ges \u00e5ret rundt, fanger de nye dyr, efterh\u00e5nden som de rykker ind &#8211; i stedet for at du starter forfra hver gang. Det er form\u00e5let med et <a href=\"https:\/\/www.rattech.com\/product\/abonnement\/\">l\u00f8bende abonnement med overv\u00e5gning og service<\/a>.<\/li>\n<li><strong>Anmeld rotterne.<\/strong> Kommunen har ansvaret for rottebek\u00e6mpelse i Danmark, og du har pligt til at anmelde rotter. Det g\u00f8res via din kommunes selvbetjening, som du finder via <a href=\"https:\/\/www.borger.dk\" rel=\"nofollow\">Borger.dk<\/a>.<\/li>\n<\/ol>\n<h2>Kan man se p\u00e5 en rotte, hvor gammel den er?<\/h2>\n<p>Ikke pr\u00e6cist, men st\u00f8rrelsen giver et brugbart pejlem\u00e6rke. En brun rotte er if\u00f8lge Videnskab.dk (2021) k\u00f8nsmoden ved cirka 150 gram og omkring 3 m\u00e5neder, mens fuldvoksne dyr vejer cirka 200 gram (hunner) og 250 gram (hanner). Et dyr, der tydeligt er mindre end det, er et ungdyr fra et kuld i n\u00e6rheden &#8211; hvilket n\u00e6sten altid betyder, at der er flere.<\/p>\n<p>St\u00f8rrelse forveksles til geng\u00e6ld ofte med artsbestemmelse. Et lille dyr i k\u00e6lderen er ikke automatisk en ung rotte, og forkert bestemmelse f\u00f8rer til forkert indsats. Vi har beskrevet kendetegnene i vores guide til <a href=\"https:\/\/www.rattech.com\/forskel-paa-rotter-og-mus\/\">forskellen p\u00e5 rotter og mus<\/a>.<\/p>\n<h2>Er gamle rotter farligere end unge?<\/h2>\n<p>Alder er ikke det afg\u00f8rende &#8211; antallet af dyr og deres adgang til mennesker er. Rotter kan b\u00e6re leptospirose (Weils syge), og if\u00f8lge Statens Serum Institut diagnosticeres der mellem 10 og 30 tilf\u00e6lde \u00e5rligt i Danmark, prim\u00e6rt hos erhvervsm\u00e6ssigt udsatte som kloakarbejdere og personer med kontakt til ferskvand. Smitten sker via urin, der kommer ind gennem sm\u00e5 s\u00e5r i huden.<\/p>\n<p>Risikoen stiger derfor med bestandens st\u00f8rrelse og med, hvor t\u00e6t rotterne kommer p\u00e5 foder, affald og opholdsrum &#8211; ikke med den enkelte rottes alder. Det er endnu et argument for at sl\u00e5 ned p\u00e5 de unge dyr tidligt, inden de selv f\u00e5r kuld.<\/p>\n<div class=\"rt-cta\">\n<h3>Slip af med rotterne \u2014 helt uden gift<\/h3>\n<p>RatTechs digitale f\u00e6lder afliver rotterne mekanisk og overv\u00e5ger d\u00f8gnet rundt. Vi st\u00e5r for montering, service og t\u00f8mning, s\u00e5 du aldrig skal h\u00e5ndtere hverken gift eller kadaver.<\/p>\n<p>  <a class=\"rt-cta-btn\" href=\"\/product\/grundpakke\/\">Se grundpakken<\/a>\n<\/div>\n<h2>Ofte stillede sp\u00f8rgsm\u00e5l<\/h2>\n<div class=\"rt-faq\">\n<details>\n<summary>Hvor gammel bliver en rotte maksimalt?<\/summary>\n<div class=\"rt-faq-a\">Den biologiske maksimumalder for en brun rotte er 2-3 \u00e5r if\u00f8lge Videnskab.dk (2021) med oplysninger fra Aarhus Universitet. Den alder n\u00e5s dog stort set kun under beskyttede forhold uden rovdyr, frost og f\u00f8demangel. I naturen lever en vild rotte i gennemsnit kun omkring 4 m\u00e5neder.<\/div>\n<\/details>\n<details>\n<summary>Hvor gammel er en rotte, n\u00e5r den kan f\u00e5 unger?<\/summary>\n<div class=\"rt-faq-a\">En rotte er k\u00f8nsmoden efter cirka 3 m\u00e5neder ved en v\u00e6gt p\u00e5 omkring 150 gram, oplyser Videnskab.dk (2021). Dr\u00e6gtigheden er kun 21-22 dage, og hunnen kan f\u00e5 3-7 kuld om \u00e5ret med 4-12 unger per kuld. Derfor vokser en bestand meget hurtigt.<\/div>\n<\/details>\n<details>\n<summary>Lever rotter i kloakken l\u00e6ngere end rotter udend\u00f8rs?<\/summary>\n<div class=\"rt-faq-a\">Rotter med adgang til kloak, k\u00e6lder eller varme konstruktioner lever efter alt at d\u00f8mme l\u00e6ngere end rotter i det fri, fordi de undg\u00e5r frost, rovdyr og f\u00f8demangel. De n\u00e6rmer sig dermed maksimum p\u00e5 2-3 \u00e5r frem for gennemsnittet p\u00e5 cirka 4 m\u00e5neder. Derfor b\u00f8r indend\u00f8rs forekomster h\u00e5ndteres straks.<\/div>\n<\/details>\n<details>\n<summary>Hj\u00e6lper det at sl\u00e5 enkelte rotter ihjel, n\u00e5r de lever s\u00e5 kort?<\/summary>\n<div class=\"rt-faq-a\">Sj\u00e6ldent alene. Fordi rotter er k\u00f8nsmodne efter cirka 3 m\u00e5neder og f\u00e5r 3-7 kuld om \u00e5ret, erstattes de dr\u00e6bte dyr hurtigt af nye. Effekten kommer af at kombinere permanent fangsttryk med lukning af adgangsvejene, typisk defekte kloakker, og anmeldelse til kommunen.<\/div>\n<\/details>\n<details>\n<summary>Hvor gammel bliver en rotte i fangenskab?<\/summary>\n<div class=\"rt-faq-a\">En rotte under beskyttede forhold kan n\u00e5 artens biologiske maksimum p\u00e5 2-3 \u00e5r, mens en vild rotte i gennemsnit kun lever omkring 4 m\u00e5neder if\u00f8lge Videnskab.dk (2021). Forskellen skyldes, at rovdyr, frost, sult og bek\u00e6mpelse stort set er sat ud af kraft, n\u00e5r foder og temperatur er stabile.<\/div>\n<\/details>\n<\/div>\n<h2>Kilder<\/h2>\n<ul>\n<li>Videnskab.dk (2021): &#8220;Derfor er rotten det perfekte skadedyr&#8221;, med Aage Kristian Olsen Alstrup, Aarhus Universitet &#8211; levealder, v\u00e6gt, k\u00f8nsmodenhed, dr\u00e6gtighed og kuldst\u00f8rrelse. <a href=\"https:\/\/videnskab.dk\/naturvidenskab\/derfor-er-rotten-det-perfekte-skadedyr\/\" rel=\"nofollow\">videnskab.dk<\/a><\/li>\n<li>DCE &#8211; Nationalt Center for Milj\u00f8 og Energi, Aarhus Universitet (2010): Faglig rapport nr. 788, &#8220;Forekomst af antikoagulante rodenticider i danske rovfugle, ugler og sm\u00e5 rovpattedyr&#8221;. <a href=\"https:\/\/dce.au.dk\/udgivelser\/tidligere-udgivelser\/udgivelser-fra-dmu\/faglige-rapporter\/nr.750-799\/abstracts\/nr788forekomstafantikoagulanterodenticideridanskerovfugleugl\" rel=\"nofollow\">dce.au.dk<\/a><\/li>\n<li>Milj\u00f8styrelsen: rottegift, resistensstrategi og autorisationskrav (R1\/R2). <a href=\"https:\/\/mst.dk\/erhverv\/rent-miljoe-og-sikker-forsyning\/rottebekaempelse\/rottegift\" rel=\"nofollow\">mst.dk<\/a><\/li>\n<li>Milj\u00f8styrelsen: data om rotteanmeldelser i Danmark (2025-tallet p\u00e5 197.639 anmeldelser mod 141.854 i 2023 blev offentliggjort i juli 2026). <a href=\"https:\/\/mst.dk\/erhverv\/rent-miljoe-og-sikker-forsyning\/rottebekaempelse\/data-om-rotter\/rotteanmeldelser-indendoersudendoers\" rel=\"nofollow\">mst.dk<\/a><\/li>\n<li>Statens Serum Institut: leptospirose (Weils syge), 10-30 diagnosticerede tilf\u00e6lde \u00e5rligt i Danmark. <a href=\"https:\/\/www.ssi.dk\/sygdomme-beredskab-og-forskning\/sygdomsleksikon\/l\/leptospirose\" rel=\"nofollow\">ssi.dk<\/a><\/li>\n<li>Borger.dk: anmeldelse af rotter til kommunen. <a href=\"https:\/\/www.borger.dk\" rel=\"nofollow\">borger.dk<\/a><\/li>\n<\/ul>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"BlogPosting\",\"headline\":\"Hvor gammel kan en rotte blive? 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Den alder n\u00e5s dog stort set kun under beskyttede forhold uden rovdyr, frost og f\u00f8demangel. I naturen lever en vild rotte i gennemsnit kun omkring 4 m\u00e5neder.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Hvor gammel er en rotte, n\u00e5r den kan f\u00e5 unger?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"En rotte er k\u00f8nsmoden efter cirka 3 m\u00e5neder ved en v\u00e6gt p\u00e5 omkring 150 gram, oplyser Videnskab.dk (2021). Dr\u00e6gtigheden er kun 21-22 dage, og hunnen kan f\u00e5 3-7 kuld om \u00e5ret med 4-12 unger per kuld. Derfor vokser en bestand meget hurtigt.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Lever rotter i kloakken l\u00e6ngere end rotter udend\u00f8rs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Rotter med adgang til kloak, k\u00e6lder eller varme konstruktioner lever efter alt at d\u00f8mme l\u00e6ngere end rotter i det fri, fordi de undg\u00e5r frost, rovdyr og f\u00f8demangel. De n\u00e6rmer sig dermed maksimum p\u00e5 2-3 \u00e5r frem for gennemsnittet p\u00e5 cirka 4 m\u00e5neder. Derfor b\u00f8r indend\u00f8rs forekomster h\u00e5ndteres straks.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Hj\u00e6lper det at sl\u00e5 enkelte rotter ihjel, n\u00e5r de lever s\u00e5 kort?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Sj\u00e6ldent alene. Fordi rotter er k\u00f8nsmodne efter cirka 3 m\u00e5neder og f\u00e5r 3-7 kuld om \u00e5ret, erstattes de dr\u00e6bte dyr hurtigt af nye. Effekten kommer af at kombinere permanent fangsttryk med lukning af adgangsvejene, typisk defekte kloakker, og anmeldelse til kommunen.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Hvor gammel bliver en rotte i fangenskab?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"En rotte under beskyttede forhold kan n\u00e5 artens biologiske maksimum p\u00e5 2-3 \u00e5r, mens en vild rotte i gennemsnit kun lever omkring 4 m\u00e5neder if\u00f8lge Videnskab.dk (2021). Forskellen skyldes, at rovdyr, frost, sult og bek\u00e6mpelse stort set er sat ud af kraft, n\u00e5r foder og temperatur er stabile.\"\n      }\n    }\n  ]\n}<\/script>\n<\/div>\n<aside class=\"rt-contact\">\n  <span class=\"rt-contact-badge\">Giftfri rottebek\u00e6mpelse<\/span><\/p>\n<h3>Har du rotter?<\/h3>\n<p>F\u00e5 en uforpligtende snak om digital, giftfri bek\u00e6mpelse \u2014 vi d\u00e6kker Sj\u00e6lland og Stork\u00f8benhavn.<\/p>\n<p class=\"rt-contact-phone\"><a href=\"tel:+4570200091\">70 20 00 91<\/a><\/p>\n<p class=\"rt-contact-mail\"><a href=\"mailto:info@rattech.com\">info@rattech.com<\/a><\/p>\n<p>  <a class=\"rt-contact-btn\" href=\"\/product\/gennemgang-af-ejendom\/\"><svg width=\"17\" height=\"17\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"3\" y=\"4\" width=\"18\" height=\"18\" rx=\"2\"\/><path d=\"M16 2v4M8 2v4M3 10h18M9 16l2 2 4-4\"\/><\/svg>Book en ejendomsgennemgang<\/a><br \/>\n<\/aside>\n<\/div>\n<p><script id=\"rt-table-labels\">\n(function(){function go(){document.querySelectorAll('.rt-main table').forEach(function(t){\nvar hs=[].map.call(t.querySelectorAll('thead th'),function(th){return th.textContent.trim();});\nt.querySelectorAll('tbody tr').forEach(function(tr){[].forEach.call(tr.children,function(td,i){if(hs[i])td.setAttribute('data-label',hs[i]);});});});}\nif(document.readyState!=='loading')go();else document.addEventListener('DOMContentLoaded',go);})();\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>En vild rotte lever typisk kun omkring 4 m\u00e5neder og maksimalt 2-3 \u00e5r. Se rottens livsforl\u00f8b m\u00e5ned for m\u00e5ned &#8211; og hvad alderen betyder for bek\u00e6mpelsen.<\/p>","protected":false},"author":7,"featured_media":1051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3251","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RatTech<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rattech.com\/pl\/hvor-gammel-kan-en-rotte-blive\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rattech.com\/pl\/hvor-gammel-kan-en-rotte-blive\/\" \/>\n<meta property=\"og:site_name\" content=\"RatTech\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-04T20:14:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-04T20:14:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rattech.com\/wp-content\/uploads\/2025\/11\/brun-rotte-1024x683.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"683\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"space\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napisane przez\" \/>\n\t<meta name=\"twitter:data1\" content=\"space\" \/>\n\t<meta name=\"twitter:label2\" content=\"Szacowany czas czytania\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minut\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.rattech.com\\\/hvor-gammel-kan-en-rotte-blive\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.rattech.com\\\/hvor-gammel-kan-en-rotte-blive\\\/\"},\"author\":{\"name\":\"space\",\"@id\":\"https:\\\/\\\/www.rattech.com\\\/en\\\/#\\\/schema\\\/person\\\/bc212bbb4bd24f92a7afa66f5c1f4661\"},\"headline\":\"Hvor gammel kan en rotte blive? 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