Organic EprintsForlænget kælvningsinterval - kan være en fordelagtig produktionsstrategiHans ChristianChristiansenauthorAllanDanfærauthorJakobSehestedauthorEn forlængelse af laktationsperioden og dermed kælvningsintervallet til 18 måneder giver mulighed for øget andel af grovfoder i rationen. Det skyldes, at der bliver forholdsvis færre dage i tidlig laktation, hvor tildelingen af koncentreret foder er størst. Et længere kælvningsinterval betyder endvidere færre golddage per årsko, idet antal golddage per laktation var uændret. En forlængelse af kælvningsintervallet betød, at laktationsydelsen steg fra 7.656 til 11.516 kg EKM. Omregnet til ydelse per årsko giver det 7.635 versus 8.006 kg EKM ved det forlængede kælvningsinterval, altså en stigning på 371 kg EKM sammenlignet med et traditionelt kælvningsinterval. Et normalt foderniveau er en forudsætning for at opnå denne ydelsesstigning ved at forlænge kælvningsintervallet, idet der ikke blev opnået tilsvarende resultater ved et lavt foderniveau. Dairy cattle Production systems2005-05Dansk KvægJournal paper

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