How To... 05 Individually Weigh Broiler Breeders in Rear Why individually weigh broiler breeders in rear? Routine accurate estimates of average body weight allows: • Correct feed allocation to a population during rear and production. • Correct control of both male and female body weights which will optimize performance at every stage of life. • Recording individual body weights from 14 to 21 days of age onwards allows CV% and grading populations to be accurately managed. 01 Why individually weigh broiler breeders in rear?
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How To...
05
Individually Weigh BroilerBreeders in Rear
Why individually weigh broiler breeders in rear?
Routine accurate estimates of average body weight allows:
The procedure for individually weighing broiler breeders in rearBird HandlingBirds must be handled in a calm and correct way by people who have been appropriately trained. Bird welfare must be a priority at all times.
Equipment1. Agoodsetofelectronicormanual /mechanicaldial scaleswith10g (0.02 lb) increments, an
Step 1 Suspend/situatescalesinasecure,easilyaccessibleplace in thepenwhereweighingwill takeplace.Setthescalestozeroandhaveasecureshackletoholdbirdsinplacebeforeweighingbegins.
Step 2 Catch andpen up a sample of at least 2%or 50birdsperpopulation,whichever isgreater. Inrear,if the population size is greater than 1000 birds,samplesshouldbetakenfrom2differentlocationsinthepenorhouse.Samplesshouldbetakenfromtowardsthemiddleofeachpenorhouseavoidingsidewallareasandareasclosetoentrancedoors.
Step 3 Collectingonebirdatatime,placeitslegsintotheshackles,wait until the bird is calm and read theweightfromthescale(tothenearest20g[0.04lb]formechanicalscales).
Step 4 Record the weight obtained and gently release the weighedbirdbackintothemainpenpopulation.
Mechanical scales require manual data records to bekeptanddatacalculationstobemadefor:
o Totalnumberofbirdsweighed.o Averageweightperbird(Totalweightofallbirds
Step 6 CalculateaverageweightandtheCoefficientofVariation(CV%).CV%isusuallycalculatedautomatically when using digital scales. If manual scales are used, it will be necessaryto calculate the standard deviation using either a scientific calculator or a computerspreadsheet.
CURRRRRENENTT DAD TATTTTTTT METE RICTOOOTATT L WEWEIGII HEHHHHED:D 79AVERAGAGA E WEW IGIIIIIII HTT: 0.471DEVIATION: 000.048888C.V. (%):: 10.2
Band llimits sssssssss Total0.0 320 to 0.3. 39 10.340 to 0.3.33359 10.000000 3636363636636363633666600000000000 tototototottooooo 000000000000.33333333379797797979777797779777997997 22222222222222220.380 to 0.3999 20.400 to 0.4191 40.420 to 0.4393 7770...44440 to 0.44599 120.0 460 to 0.47999 1150.480 to 00.4999 114440.50500 ttototot 000.5. 19 1000.000 5200 toto 0.539 60.545455 0 totoo 0.555595 30.58800000 too 0.59999 2
05Interpreting resultsA deviation from expected body weight may be due to an inaccurate weighing. If aninconsistentbodyweightisrecorded,checkthatthescalesareworkingcorrectlyandthenweighasecondsampleofbirdsimmediatelyasacheckbeforemakinganychangestofeedlevels.
Days 14 to 21Adeviationfromstandardbodyweightbetween14and21daysgenerallyindicates:
• Re-drawthebodyweightcurve tobringbirdsgraduallybackon to targetby63daysofage.Never reduce feed levels; reduce the next feed increment or delay the next feed increase in order toachievetherevisedbody-weighttarget.
• If birds remain over targetweight from 63 days onward, then the target should beredrawn parallel to the profile. Do not attempt to bring these birds back to the profile.Birdsshouldbefedtheleveloffeedtomaintainthisprofile.