大約克夏豬的選育—群體繼代選育法對大約克夏豬生產(chǎn)性能的影響.pdf

1、江西農(nóng)業(yè)大學(xué)碩士學(xué)位論文大約克夏豬的選育—群體繼代選育法對大約克夏豬生產(chǎn)性能的影響姓名：吳華東申請學(xué)位級別：碩士專業(yè)：動(dòng)物遺傳育種與繁殖指導(dǎo)教師：黃路生2002.5.1／查竺壅墨墮竺墊宣二壁堡竺垡墊宣鯊塾查竺塞墨塹生蘭竺堂墮墅!塑一——一AbstractThisstudyaimsatimprovingtheproductiveperformanceoftheLargeYorkshirebyopenedherdbreedingcombin

2、ingthesibtestingandbodilyformindexInterestingtraitsareincludingthelivelittersizeandtheweaninglitterweightofreproductivetraits，theaveragedailygainandthefeedconversionrateoffatteningtraits，thelivingbodylengthandthelivingba

3、ck—fatthicknessofcarcasstraitsTheresultsofseven—yearopenedherdbreedingis：TheLargeYorkshiresaveragedailygainincreased104239from714579to818809increased14899everyyear；Thefeedconversionratedescended77％from293to272Thelivelitt

4、el4sizeincreasedO30pigletsfrom1187to1217pigletsincreasedO043piglets—everyyear；Theweaningweightincreased040Kgfrom795Kgto835Kg；Theweaningweightoflitterincreased1O46Kgfrom8865Kgto9911Kg，increased149KgeveryyearThecarcassleng

5、thofLargeYorkshireof90Kgincreased200emfrom8794to8994cm，increased029cmeveryyear；Theback—fatthicknessdescended014cmfrom194emto180cmdescended002cmeveryyear；Theeyemuscleareaincreased304cm2from3621cm2to3925em2，theleanmeatrate

6、increased329％from6358％to6687％，increased043％everyyearThereservebreedingofLargeYorkshiresbodylivinglengthincreased819cmfrom11722cmto12541cm，increased117cmeveryyear；Theaveragedailygainincreased589from7549to8129；Thelivingbac

7、k—fatthicknessdescended016cmfrom201cmto185Cln；Thefeedconversionratedescended023％fr0111291to264’FheresultindicatesthattheproductiveperformanceofLargeYorkshirecanbeincreasedbyopenedherdbreedingAnditalsoindicatesthatitisfea

8、sibleuselivingbodylengthandlivingback—fatthicknessteplacethecarcasslengthandthecarcassback—fatthicknessinordertoreducegenerationintervalandpickupgeneticadvanceKeyWordsSelection，Large—Yorkshire，ProductivePerformance，Opene