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An assessment of the efficiency of the dairy bull dam selection methodology in Kenya

机译:对肯尼亚奶牛大坝选择方法效率的评估

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摘要

Dataconsistingof5670lactationrecordsmadeby2958cowsbetween1990and2004from18AyrshireherdswereusedtoevaluatetheefficiencyofthecurrentbulldamselectionmethodinKenya.AunivariateDF-REMLprocedureandtheanimalmodelwithrelationshipwasusedtoestimateBreedingValues(BVs)forunadjustedtotallactationmilkyield,asusedbythecurrentmethodology.Themeanmilkyieldwas4085KgwithSDof1396Kg,andthebreedingvalues(BVs)formilkyieldforalltheanimalsrangedfrom-979kgto+1115Kg.withaheritabilityof0.18#177;0.045.TheBVswerethenarrangedindescendingorderandthenranked.Basedontheunadjustedlactationrecords,theBVsforthetop100cowsrangedfrom+550Kgto+1115Kg.Only25ofthe113bulldamsthatwereincludedinthestudywererankedinthetop100cows.Theresultsindicatethattherearealargenumberofcowsinthenationalherdwithhighgeneticmeritthathadbeenleftoutofthebreedingprogrammeusingthecurrentbulldamselectionmethodologyandthatcowswithlowergeneticmerithavebeenusedduetotheinefficiencyofthecurrentbulldamselectionmethod.Thus,thecurrentmethodofbulldamselectionisinefficientandneedstobeimprovedbygeneticevaluationofallthecowsbeforebulldamselection.
机译:Dataconsistingof5670lactationrecordsmadeby2958cowsbetween1990and2004from18AyrshireherdswereusedtoevaluatetheefficiencyofthecurrentbulldamselectionmethodinKenya.AunivariateDF-REMLprocedureandtheanimalmodelwithrelationshipwasusedtoestimateBreedingValues(的BV)forunadjustedtotallactationmilkyield,asusedbythecurrentmethodology.Themeanmilkyieldwas4085KgwithSDof1396Kg,andthebreedingvalues(的BV)formilkyieldforalltheanimalsrangedfrom-979kgto + 1115Kg.withaheritabilityof0.18;#177; 0.045.TheBVswerethenarrangedindescendingorderandthenranked.Basedontheunadjustedlactationrecords,theBVsforthetop100cowsrangedfrom + 550Kgto + 1115Kg.Only25ofthe113bulldamsthatwereincludedinthestudywererankedinthetop100cows.Theresultsindicatethattherearealargenumberofcowsinthenationalherdwithhighgeneticmeritthathadbeenleftoutofthebreedingprogrammeusingthecurrentbulldamselectionmethodologyandthatcowswithlowergeneticmerithavebeenusedduetotheinefficiencyofthecurrentbulldamselectionmethod.Thus,thecurrentmethodofbulldamselectionisineff在选择大坝之前,应通过对牛群进行遗传评估来改进科学和需要。

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