{"id":54692,"date":"2025-11-04T14:00:17","date_gmt":"2025-11-04T14:00:17","guid":{"rendered":"https:\/\/matis.is\/?p=54692"},"modified":"2025-11-04T14:01:09","modified_gmt":"2025-11-04T14:01:09","slug":"fitusprenging-i-islensku-lambakjoti-marbling-of-icelandic-lamb-meat","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/skyrsla\/fitusprenging-i-islensku-lambakjoti-marbling-of-icelandic-lamb-meat\/","title":{"rendered":"Fitusprenging \u00ed \u00edslensku lambakj\u00f6ti \/ Marbling of Icelandic lamb meat"},"content":{"rendered":"<p>Haldi\u00f0 var \u00e1fram a\u00f0 kanna fitusprengingu og \u00e1hrif hennar \u00e1 brag\u00f0g\u00e6\u00f0i lambakj\u00f6ts \u00e1 \u00cdslandi. \u00der\u00f3a\u00f0ur var myndakvar\u00f0i til a\u00f0 meta fitusprengingu \u00ed lambav\u00f6\u00f0vum og hann nota\u00f0ur vi\u00f0 mat \u00e1 um 500 k\u00e6ldum skrokkum fr\u00e1 \u00feremur r\u00e6ktunarb\u00faum \u00ed sl\u00e1turh\u00fasum hausti\u00f0 2023. Einnig voru tekin s\u00fdni af hryggv\u00f6\u00f0vum og innanv\u00f6\u00f0vafita m\u00e6ld \u00ed \u00feeim me\u00f0 NIR-m\u00e6lingu. Tekin var saman sk\u00fdrsla um hra\u00f0virkar a\u00f0fer\u00f0ir vi\u00f0 m\u00e6lingar \u00e1 innanv\u00f6\u00f0vafitu \u00ed lambav\u00f6\u00f0vum. Skynmat var gert \u00e1 52 s\u00fdnum af lambahryggv\u00f6\u00f0va til a\u00f0 kanna \u00e1hrif fituflokka (2<sup>&#8211;<\/sup>,2 og 3<sup>+<\/sup> samkv\u00e6mt reglum \u00a0Evr\u00f3pusambandsins) og kyns \u00e1 brag\u00f0, lykt og \u00e1fer\u00f0.<\/p>\n\n\n\n<p>Erfitt var vegna l\u00edtillar fitusprengingar a\u00f0 nota myndakvar\u00f0a til a\u00f0 meta fitusprengingu \u00ed hryggv\u00f6\u00f0vum lamba.&nbsp; Fylgni \u00e1 milli sj\u00f3nmats og NIR m\u00e6linga var of l\u00edtil til a\u00f0 h\u00e6gt s\u00e9 a\u00f0 nota sj\u00f3nmati\u00f0 me\u00f0 \u00e1rei\u00f0anlegum h\u00e6tti.&nbsp; A\u00f0hvarfsl\u00edking var \u00fer\u00f3u\u00f0 fyrir NIR m\u00e6lingu sem m\u00e6ldi fitu me\u00f0 s\u00e6milegri n\u00e1kv\u00e6mni.&nbsp; \u00cd sumum tilfellum en ekki \u00f6llum var munur \u00e1 milli hr\u00fatlamba og gimbrarlamba \u00ed fitu \u00ed hryggv\u00f6\u00f0va. Me\u00f0alfita \u00ed hryggv\u00f6\u00f0va lamba eftir b\u00e6jum var 2,0%, 2,3% og 3.0%.&nbsp;&nbsp; Fita \u00ed hryggv\u00f6\u00f0va var \u00e1 bilinu 0,4 \u2013 8,0 % \u00fe.e. t\u00f6luver\u00f0ur breytileiki og h\u00e6rri gildi en \u00ed fyrri m\u00e6lingum. Munur \u00e1 innanv\u00f6\u00f0vafitu \u00e1 milli gimbrarlamda og hr\u00fatlamba var enginn \u00e1 einu b\u00fai (2,01% og 1,99%) og seinni sl\u00e1trun \u00e1 \u00f6\u00f0ru b\u00fai ( 3,11% \u00e1 m\u00f3ti 3,07%) en t\u00f6luver\u00f0ur \u00e1 tveimur b\u00faum ( 2,94% \u00e1 m\u00f3ti 1,99% og 2,90% \u00e1 m\u00f3ti 2,10%).<\/p>\n\n\n\n<p>Hryggv\u00f6\u00f0var lamba \u00far fituflokki 3+ h\u00f6f\u00f0u tilhneigingu til a\u00f0 vera \u00f6rl\u00edti\u00f0 m\u00fdkri, safar\u00edkari og meyrari en kj\u00f6t af l\u00f6mbum \u00far fituflokkum&nbsp;2 og \u20112. Ni\u00f0ursta\u00f0an var ekki eins afgerandi ni\u00f0ursta\u00f0a og \u00ed svipa\u00f0ri tilraun sem ger\u00f0 var \u00e1ri\u00f0 2022. Kj\u00f6t af hr\u00fatl\u00f6mbum haf\u00f0i meiri fitulykt og \u00feyngri lykt, og haf\u00f0i einnig tilhneigingu til a\u00f0 hafa meiri s\u00fara lykt, meira fitu- og lifrarbrag\u00f0, og vera \u00feurrara en kj\u00f6t af gimbrarl\u00f6mbum.<\/p>\n\n\n\n<p>Uppl\u00fdsingar um &nbsp;fitusprengingu \u00ed \u00edslensku lambakj\u00f6ti eru enn of takmarka\u00f0ar til a\u00f0 f\u00e1 sv\u00f6r vi\u00f0 \u00fev\u00ed hvort taka eigi fitusprengingu inn \u00ed kynb\u00f3tamarkmi\u00f0. \u00c1vinningur verkefnisins er fyrst og fremst reynsla, \u00feekking og uppl\u00fdsingar sem n\u00fdtast vi\u00f0 frekari ranns\u00f3knir var\u00f0andi r\u00e6ktunarstarf, vinnslu lambaskrokka og marka\u00f0ssetningu lambakj\u00f6ts.<br>_____<br><br>Four-point visual grading scale was used to evaluate marbling in loin muscles (<em>m.l. dorsi<\/em>) in chilled carcases of 500 lambs from three breeding farms.&nbsp; Correlation with NIR analyses of intramuscular fat was low.&nbsp; More training and development of NIR methodology is needed for future research and breeding for higher intramuscular fat.&nbsp; Analysed intramuscular fat was between 0,4 and 8% and the average for the three farms was 2,0%, 2,3% and 3% respectively with great variation within each group. So, there may be a potential for genetic selection for higher intramuscular fat.<\/p>\n\n\n\n<p>The influence of EUROP carcass fat grade (2<sup>&#8211;<\/sup>, 2 and 3<sup>+<\/sup>) of slaughter lambs on eating quality of loin muscles (m l.dorsi) was studied.&nbsp; Samples of loin muscles of carcases of ewe and ram lambs were evaluated using descriptive sensory analysis to determine eating quality.&nbsp; No differences in eating quality attributes between fat grades were observed but meat from grade 3+ had the tendency to be a little juicier, softer and more tender.<\/p>\n\n\n\n<p>The first aim of the project was to gather information and develop methodology and gain experience to be able to the answer if intramuscular fat should be a breeding goal to improve eating quality of Icelandic lamb meat.&nbsp; That is too early to say. Much more work needs to be done, and information are still too limited to say so.&nbsp;<\/p>\n\n\n\n<p>Meat from ram lambs had stronger odour (fatty and heavy) the meat from ewe lambs.&nbsp; No gender differences in intramuscular fat were observed in between ewe lambs and ram lambs (2,01% vs 1,99%) from two farms (2,01% versus1,99% 3,11% versus 3,07%) while a difference was observed at two farms ( 2,94% versus 1,99% and 2,90% versus 2,10%).&nbsp;&nbsp;<\/p>\n\n\n\n<p>The second aim was to determine if by implementing subgroups of fat grades of carcases the meat could be more separated into quality groups for processing and marketing purposes.&nbsp; About 85% of the lamb carcases produced in Iceland are within main fat groups 2 and 3.&nbsp;&nbsp; Subgroup 3+ might be 15% of the total production. Meat from that group had tendency to be juicier and more tender supporting results from the year 2022.&nbsp;&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Haldi\u00f0 var \u00e1fram a\u00f0 kanna fitusprengingu og \u00e1hrif hennar \u00e1 brag\u00f0g\u00e6\u00f0i lambakj\u00f6ts \u00e1 \u00cdslandi. \u00der\u00f3a\u00f0ur var myndakvar\u00f0i til a\u00f0 meta [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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