[{"data":1,"prerenderedAt":423},["ShallowReactive",2],{"content-\u002Fen\u002Fbroiler\u002Fday-21":3},{"_path":4,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":8,"description":9,"id":10,"language":11,"category":5,"subcategory":12,"tags":13,"difficulty":17,"readingTime":18,"author":19,"lastReviewed":20,"version":21,"translationVersion":21,"related":22,"seo":25,"breed":33,"targetAgeDays":36,"body":37,"_type":417,"_id":418,"_source":419,"_file":420,"_stem":421,"_extension":422},"\u002Fen\u002Fbroiler\u002Fday-21","broiler",false,"","Day 21 Management: Transitioning to Finisher Feed & Ventilation Control","Critical Day 21 management principles for broiler farms including target weight parameters, feed phase adaptation, vaccine audits, and ventilation balance.","pknow_broiler_day_21","en","daily",[14,5,15,16],"management","day-21","ventilation","intermediate",6,"Dr. K. Radhakrishnan (Veterinary Consultant)","2026-06-25",1,[23,24],"\u002Fen\u002Fbroiler\u002Fday-35","\u002Fen\u002Fglossary\u002Ffcr",{"keywords":26,"canonical":32},[27,28,29,30,31],"broiler day 21","finisher feed transition","poultry ventilation","broiler targets","target FCR day 21","https:\u002F\u002Fknowledge.kodibook.com\u002Fbroiler\u002Fday-21",[34,35],"Cobb 500","Ross 308",21,{"type":38,"children":39,"toc":401},"root",[40,48,62,66,73,78,220,223,229,234,238,242,245,251,270,277,284,301,304,310,315,322,328,333,342,350,353,359,365,370,373,379],{"type":41,"tag":42,"props":43,"children":45},"element","h1",{"id":44},"day-21-management-transitioning-to-finisher-feed-ventilation-control",[46],{"type":47,"value":8},"text",{"type":41,"tag":49,"props":50,"children":51},"p",{},[52,54,60],{"type":47,"value":53},"By ",{"type":41,"tag":55,"props":56,"children":57},"strong",{},[58],{"type":47,"value":59},"Day 21 (Week 3)",{"type":47,"value":61},", your broiler flock is entering a critical rapid-growth phase. Over the next seven days, feed consumption will multiply. This makes the next phase highly susceptible to respiratory diseases and metabolic disorders if ventilation and gut health are not maintained.",{"type":41,"tag":63,"props":64,"children":65},"hr",{},[],{"type":41,"tag":67,"props":68,"children":70},"h2",{"id":69},"_1-weekly-performance-indicators",[71],{"type":47,"value":72},"1. Weekly Performance Indicators",{"type":41,"tag":49,"props":74,"children":75},{},[76],{"type":47,"value":77},"Compare your batch to standard growth targets:",{"type":41,"tag":79,"props":80,"children":81},"table",{},[82,112],{"type":41,"tag":83,"props":84,"children":85},"thead",{},[86],{"type":41,"tag":87,"props":88,"children":89},"tr",{},[90,97,102,107],{"type":41,"tag":91,"props":92,"children":94},"th",{"align":93},"left",[95],{"type":47,"value":96},"Parameter",{"type":41,"tag":91,"props":98,"children":99},{"align":93},[100],{"type":47,"value":101},"Cobb 500 Target",{"type":41,"tag":91,"props":103,"children":104},{"align":93},[105],{"type":47,"value":106},"Ross 308 Target",{"type":41,"tag":91,"props":108,"children":109},{"align":93},[110],{"type":47,"value":111},"Ideal Range",{"type":41,"tag":113,"props":114,"children":115},"tbody",{},[116,143,169,195],{"type":41,"tag":87,"props":117,"children":118},{},[119,128,133,138],{"type":41,"tag":120,"props":121,"children":122},"td",{"align":93},[123],{"type":41,"tag":55,"props":124,"children":125},{},[126],{"type":47,"value":127},"Cumulative Feed Consumed",{"type":41,"tag":120,"props":129,"children":130},{"align":93},[131],{"type":47,"value":132},"1,280g \u002F bird",{"type":41,"tag":120,"props":134,"children":135},{"align":93},[136],{"type":47,"value":137},"1,320g \u002F bird",{"type":41,"tag":120,"props":139,"children":140},{"align":93},[141],{"type":47,"value":142},"1,250g - 1,350g",{"type":41,"tag":87,"props":144,"children":145},{},[146,154,159,164],{"type":41,"tag":120,"props":147,"children":148},{"align":93},[149],{"type":41,"tag":55,"props":150,"children":151},{},[152],{"type":47,"value":153},"Average Body Weight (ABW)",{"type":41,"tag":120,"props":155,"children":156},{"align":93},[157],{"type":47,"value":158},"980g",{"type":41,"tag":120,"props":160,"children":161},{"align":93},[162],{"type":47,"value":163},"1,020g",{"type":41,"tag":120,"props":165,"children":166},{"align":93},[167],{"type":47,"value":168},"950g - 1,050g",{"type":41,"tag":87,"props":170,"children":171},{},[172,180,185,190],{"type":41,"tag":120,"props":173,"children":174},{"align":93},[175],{"type":41,"tag":55,"props":176,"children":177},{},[178],{"type":47,"value":179},"FCR Target",{"type":41,"tag":120,"props":181,"children":182},{"align":93},[183],{"type":47,"value":184},"1.30",{"type":41,"tag":120,"props":186,"children":187},{"align":93},[188],{"type":47,"value":189},"1.29",{"type":41,"tag":120,"props":191,"children":192},{"align":93},[193],{"type":47,"value":194},"1.28 - 1.33",{"type":41,"tag":87,"props":196,"children":197},{},[198,206,211,215],{"type":41,"tag":120,"props":199,"children":200},{"align":93},[201],{"type":41,"tag":55,"props":202,"children":203},{},[204],{"type":47,"value":205},"Cumulative Mortality",{"type":41,"tag":120,"props":207,"children":208},{"align":93},[209],{"type":47,"value":210},"\u003C 1.0%",{"type":41,"tag":120,"props":212,"children":213},{"align":93},[214],{"type":47,"value":210},{"type":41,"tag":120,"props":216,"children":217},{"align":93},[218],{"type":47,"value":219},"0.0% - 1.2%",{"type":41,"tag":63,"props":221,"children":222},{},[],{"type":41,"tag":67,"props":224,"children":226},{"id":225},"_2-dynamic-calculators",[227],{"type":47,"value":228},"2. Dynamic Calculators",{"type":41,"tag":49,"props":230,"children":231},{},[232],{"type":47,"value":233},"Calculate your actual flock metrics in real-time below.",{"type":41,"tag":235,"props":236,"children":237},"f-c-r-calculator",{},[],{"type":41,"tag":239,"props":240,"children":241},"mortality-calculator",{},[],{"type":41,"tag":63,"props":243,"children":244},{},[],{"type":41,"tag":67,"props":246,"children":248},{"id":247},"_3-feeding-water-management",[249],{"type":47,"value":250},"3. Feeding & Water Management",{"type":41,"tag":49,"props":252,"children":253},{},[254,256,261,263,268],{"type":47,"value":255},"Transition the flock from ",{"type":41,"tag":55,"props":257,"children":258},{},[259],{"type":47,"value":260},"Grower Feed",{"type":47,"value":262}," to ",{"type":41,"tag":55,"props":264,"children":265},{},[266],{"type":47,"value":267},"Finisher Feed",{"type":47,"value":269},". This process must be completed gradually over 48 hours to avoid causing structural stress to the birds' digestive systems.",{"type":41,"tag":271,"props":272,"children":274},"tip",{"title":273},"Gradual Transition Protocol",[275],{"type":47,"value":276},"\n**Day 20 (Evening):** Mix 75% Grower + 25% Finisher.  \n**Day 21 (All Day):** Mix 50% Grower + 50% Finisher.  \n**Day 22 (Morning):** Mix 25% Grower + 75% Finisher.  \n**Day 22 (Evening onwards):** 100% Finisher feed.\n",{"type":41,"tag":278,"props":279,"children":281},"h3",{"id":280},"checklists-for-feed-water",[282],{"type":47,"value":283},"Checklists for Feed & Water",{"type":41,"tag":285,"props":286,"children":287},"checklist",{},[288],{"type":41,"tag":49,"props":289,"children":290},{},[291,293,299],{"type":47,"value":292},"{\n\"title\": \"Day 21 Feed & Water Verification Checks\",\n\"items\": ",{"type":41,"tag":294,"props":295,"children":296},"span",{},[297],{"type":47,"value":298},"\n\"Increase feeder heights so the lip matches the level of the bird's breast.\",\n\"Adjust nipple drinking lines so birds drink at a 45-degree angle.\",\n\"Flush water lines to remove biofilm build-ups using chlorine dioxide.\",\n\"Run visual inspection of feed storage bins to ensure no dampness or mold.\"\n",{"type":47,"value":300},"\n}",{"type":41,"tag":63,"props":302,"children":303},{},[],{"type":41,"tag":67,"props":305,"children":307},{"id":306},"_4-ventilation-litter-management",[308],{"type":47,"value":309},"4. Ventilation & Litter Management",{"type":41,"tag":49,"props":311,"children":312},{},[313],{"type":47,"value":314},"With increased feed and water intake, the volume of manure excreted grows exponentially. Ammonia control is the primary objective of Day 21 management.",{"type":41,"tag":316,"props":317,"children":319},"warning",{"title":318},"Ammonia Spike Hazard",[320],{"type":47,"value":321},"\nIf you detect an ammonia smell at human chest height (approx 15-20 ppm), levels at bird level are already above 35 ppm. This causes tracheal damage, increases susceptibility to infectious bronchitis, and triggers Newcastle disease outbreaks.\n",{"type":41,"tag":278,"props":323,"children":325},{"id":324},"bio-monitoring-health-observations",[326],{"type":47,"value":327},"Bio-Monitoring & Health Observations",{"type":41,"tag":49,"props":329,"children":330},{},[331],{"type":47,"value":332},"Maintain high visual standards in the house.",{"type":41,"tag":334,"props":335,"children":336},"healthy-sign",{},[337],{"type":41,"tag":49,"props":338,"children":339},{},[340],{"type":47,"value":341},"{\n\"indicator\": \"Even spread of birds\"\n}\nBirds are spaced evenly throughout the house. This indicates optimal temperature distribution and proper draft ventilation.",{"type":41,"tag":334,"props":343,"children":344},{},[345],{"type":41,"tag":49,"props":346,"children":347},{},[348],{"type":47,"value":349},"{\n\"indicator\": \"Clear, bright eyes and high alertness\"\n}\nFlock responds immediately when you make sounds or enter the pen, signifying clean air and zero respiratory congestion.",{"type":41,"tag":63,"props":351,"children":352},{},[],{"type":41,"tag":67,"props":354,"children":356},{"id":355},"_5-frequently-asked-questions",[357],{"type":47,"value":358},"5. Frequently Asked Questions",{"type":41,"tag":278,"props":360,"children":362},{"id":361},"why-is-my-fcr-spiking-above-150-at-day-21",[363],{"type":47,"value":364},"Why is my FCR spiking above 1.50 at Day 21?",{"type":41,"tag":49,"props":366,"children":367},{},[368],{"type":47,"value":369},"Usually, this indicates feed waste caused by feeders placed too low, or intestinal damage caused by sub-clinical coccidiosis. Verify your litter is dry and calculate FCR regularly.",{"type":41,"tag":63,"props":371,"children":372},{},[],{"type":41,"tag":67,"props":374,"children":376},{"id":375},"_6-key-references",[377],{"type":47,"value":378},"6. Key References",{"type":41,"tag":380,"props":381,"children":382},"ul",{},[383,393],{"type":41,"tag":384,"props":385,"children":386},"li",{},[387],{"type":41,"tag":388,"props":389,"children":390},"em",{},[391],{"type":47,"value":392},"Cobb 500 Broiler Management Guide (2025)",{"type":41,"tag":384,"props":394,"children":395},{},[396],{"type":41,"tag":388,"props":397,"children":398},{},[399],{"type":47,"value":400},"Indian Council of Agricultural Research (ICAR) Poultry Handbook",{"title":7,"searchDepth":402,"depth":402,"links":403},2,[404,405,406,410,413,416],{"id":69,"depth":402,"text":72},{"id":225,"depth":402,"text":228},{"id":247,"depth":402,"text":250,"children":407},[408],{"id":280,"depth":409,"text":283},3,{"id":306,"depth":402,"text":309,"children":411},[412],{"id":324,"depth":409,"text":327},{"id":355,"depth":402,"text":358,"children":414},[415],{"id":361,"depth":409,"text":364},{"id":375,"depth":402,"text":378},"markdown","content:en:broiler:day-21.md","content","en\u002Fbroiler\u002Fday-21.md","en\u002Fbroiler\u002Fday-21","md",1782549057961]