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5 steps to preventing heat stress in layers

We prevent hens from overheating. Worst case: Layers are heat-stressed, leading to significant welfare and performance problems.

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5 steps to preventing heat stress in layers

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  1. POULTRYHEALTH TODAY

  2. WelcomeToOurCompany TheU.S.PoultryBusinessisaleadingpoultryscience communicationandoutreachprogramfortheentire industry.Itservesasaplatformfortheleadersoftheworld's largestproduction,processing,andmarketingofbroiler chicken,turkeyandeggs.Wearededicatedtoinformingour membershipaboutnewresearchfindingsandtrendsin poultryhealthandperformance.Wepublishnewsonall thingsrelatedtoourbusiness–suchasgrowthopportunities andchallenges.

  3. 5Stepstopreventingheatstressinlayers

  4. We preventhensfromoverheating.Worstcase: Layersareheat-stressed, leadingtosignificantwelfareandperformanceproblems. Toproperlypreventormanageheatstress,it’simperativetounderstand howitoccurs.Alayer’snormalbodytemperatureisabout105°F(40°C). Hens arecomfortablewithanambienttemperatureof65°Fto75°F(18°C to24°C).Whenthattemperaturegetsabove90°F(32°C),themoreserious consequencesofheatstress occur.

  5. Heat-stressbasics Whenahenistoowarm,sheneedstoloseheat.Shedoesthisin severalways.Oneisbyconvection,whichislosingbodyheatto coolerairbyspreadingherwings. Anotherwayisbyevaporation.Whenthehouseistoohot,moisture fromtherespiratorytracthastobeused,causinghenstopant, whichincreasesairflowovermucousmembranes. It’simportanttonotethathumidityisrelatedtoambient temperature.Higherhumidityatanytemperatureincreasesbird discomfort, andevaporativecoolingislesseffective.Evaporative coolingiseffectiveonlywhentherelativehumidityintheairislow.

  6. Donotdisturb Ifbirdsareatriskofheatstressorarealready overheating,ithelpstoavoiddisturbingthem, especiallyduringthehottestpartoftheday,so theydon’tgethottermovingaround.Schedule mostworkinthehousetobedoneintheearly morningorintheeveningwhenit’snotsohot (rememberthatlateafternoonisthehottestpart oftheday). It’scriticalnottooverstockcages.Birdsneedtobeabletospreadtheirwingstoincreaseairflowaroundtheir bodies.Iflayershavetobemovedonahotday,placefewerineachtransportcrateandinterspersethose crateswithemptycratesforbetteraircirculation.Ifyoucan,delayingmovementuntiltheeveningwouldbe preferable.Postponebeaktrimmingtoacoolerdayortrimintheearlymorningbeforehighheatsetsin.

  7. Ventilation Properventilationiscriticaltopreventheatstressinlayersduringhot- weathermonths. Properventilationiscriticaltopreventheatstressinlayersduringhot- weathermonths. Ifyourventilationsystemfailsonahotsummerday,thetemperatureinthe housecouldriseby60°F(15°C)within1hour. Tokeepthehousecomfortableforlayers,thetotalexhaust-fancapacity shouldbeatleast3.5litrespersecondperlayinghen.Youmayneedtwoair exchangesperminute. Layer-houseinsulationisideallyR20forwallsandR28forceilingstohelp keepthehousewarminwinterbutcoolinsummer,butwheninsulationisn’t optimal,thereneedstobegreaterrelianceonotherheat-controloptions suchasfoggers,mistersorroofsprinklers.

  8. Watersystemmaintenance Atnormaltemperatures,10,000layerswilldrink2,000litresofwaterdaily,buttheirintakewillincreaseby50%ifthehousetemperaturerisesto90°F(32°C)—andthat’swhenyou’relikelytohaveaproblemwithwetlitterandsoiledeggs.Thereshouldbeadequatedrinkerspaceandmoredrinkersiflayersarefloor- reared. It’shelpfultocoolthedrinkingwaterbyflushinglinesinthe afternoon.Coolwaterhelpsbringdownthebirds’core temperature.Ifthewaterisbelow77°F(25°C),birdswilldrink more.Waterover86°F(30°C)willreducetheirwaterintake, furtherreducingfeedintake.Addingvitaminsandelectrolytesto thedrinkingwaterhelpsreplacelostsodium,chloride,potassium andbicarbonate,buttheyarebestadministeredbeforethe developmentofextremeheat.

  9. Whentodelayvaccination Sometimes,theoppositeproblemcanoccurifbirdsarevaccinated whenthey’reoverheated.Ifthey’repanting,theymaybreatheintoo muchofasprayvaccineoringesttoomuchofawater-administered vaccine.Inbothofthesesituations,birdsmayexhibitsigns ofthe diseasethatthevaccinesareintendedtoprevent. It’shardtosayexactlyhowlongyoushouldwaittovaccinatebirdsthat havebeenheatstressed.Ifthestresslastedonlyadayanddidn’tresult inanysignificantperformanceorproductionproblems,it’sprobably safetoproceedassoonasthebirdsarenolongerstressed.However, theadverseeffectofheatstressontheimmunesystemisgoingto depend on the lengthof time and severityof the heat incident;if birds werestressedmorethanaday,it’sprobablywisetowaitseveralmore daysbeforevaccinating.

  10. OurContactHere Phone:845-300-4631 Website:www.poultryhealthtoday.com Email:jesse@greatercreators.com

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