家禽数量性状的遗传

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1、家禽数量性状的遗传肉用性状（meattrait）的遗传蛋用性状（eggtrait）的遗传繁殖力和生活力的遗传饲料报酬(feedremuneration)肉用性状（meattrait）的遗传体型大小（bodysize）或体重（bodyweight）出壳体重（day-oldweight）生长期体重（growerweight）：6-7周龄体重h2=0.42-0.46成年体重（adultweight）h2=0.55-0.65肉用性状（meattrait）的遗传生长速度（growingrate）累积生长（accumulategrowing）绝对生长（absolutegrowing）相对生长（

2、relativegrowing）早期生长速度h2=0.4-0.5肉用性状（meattrait）的遗传Geneticparametersofgrowthcurveinchickens(S.Mignon-GrasteauandC.Beaumont,2002,7thWCGALP,11-3)Gompertzfunctionofgrowthcurve:Byusingdataof464chickensfromaslowgrowingmeat-typeline,whichwereweighedeverytwoweeksfrom4to16weeks,theGompertzcurvefittedwe

3、llthedata(R2=0.99),thegreatestdifferencebeinganoverestimationofbodyweightat10weeks(3.6%inmalesand2.8%infemales).肉用性状（meattrait）的遗传肉用性状（meattrait）的遗传Conclusion:Thisstudyconfirmedthatmalesandfemaleschickenscanbedistinguishedbytheirgrowthcurveparameters,femalesbeingmoreprecociousthanmales.Genetic

4、parametersoftheGompertzfunctionparametersshowedmoderateheritabilities,makingitpossibletoselectdirectlyontheformofthegrowthcurve.肉用性状（meattrait）的遗传屠宰率（dressedpercentage）h2=0.2-0.6肉用性状（meattrait）的遗传Geneticandphenotypicparametersofgrowthandcarcasstraitsofamalelineofbroilersraisedintropicalconditi

5、ons(C.Argentão1etal2002,7thWCGALP4-34)ThedatasetinformationcamefromamaleselectionlineofbroilersownedbyAgroceres-RossMelhoramentoGenéticodeAvesLtda.andraisedintropicalconditionsinfarmlocatedcloseto22ºSand48ºW,ataltitudearound700mabovesealevel.Growthdatacamefrom27,231maleandfemalebirdssubmittedt

6、oselectionanddatasethadinformationon5generationsofpedigree;Carcassdatacamefrom9,463fullsibsofbroilersfromselection,thatwereprocessedattheexperimentalslaughterhouse.Thoseanimalswereslaughteredaround42daysofage,from1999to2001.肉用性状（meattrait）的遗传Traitsmeasured:W35:weightat35daysofage,us1:ultrasoun

7、dmeasurementsonbreastmuscledepth(measurednexttomiddleline);us2:ultrasoundmeasurementsonbreastmuscledepth(measuredtransversally);FC:feedconversion;LWS:liveweightatslaughter;HCW:hotcarcassweight;Breast:debonedandskinnedchilledbreastweight