Mark Knauer 博士功能性乳头数量的基因选择.pdf

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1、Genetic selection for functional teat numberNCSU Swine Innovation ForumMay 6,2025Dr.Mark KnauerNorth Carolina State-Swine ExtensionOutlineBackgroundColostrum shortage?Collaboration with Smithfield Premium GeneticsNCDA research genetic selection lines for teat countSummaryNumber of functional teats p

2、iglet survivalEnfield&Rempel(1961)Skjervold(1963)Wiegert&Knauer(2018)Speckman et al.(2021)Earnhardt-San et al.(2023)Obermier et al.(2023)Etc.0.120.270.330.3800.10.20.30.41.531.261.070.94 in number weaned with of one teatTeat number:Number born aliveSpeckman et al.(2021)Teat number in importance as t

3、eat:litter size ratio one teat=2.5%piglet survival812180481216202 extra teatspiglets=#of teats2 more pigletsthan teatsPreweaning mortality,%Cross-foster strategyVande Pol et al.(2021)Genetics of piglet throughput(Knauer 2020),image courtesy of NHFKnauer and Wiegert(2023)Modern sow-colostrum shortage

4、405060708090100150 200 250 300 350 400 450 500 550 600 650 700 750Piglet survival,%Average piglet colostrum consumption,gramsLitter size&teat number impact colostrumTotal number bornFunctional teat numberTraitEstimateSEP-valueEstimateSEP-valuePiglet colostrum intake,g-27.01.90.0110.05.30.06Sow colos

5、trum yield,g170.428.50.01323.777.90.01Piglet colostrum intake coefficient of variation,%2.00.230.01-1.40.60.03Piglet survival,%-2.20.30.012.40.90.01Knauer and Wiegert(2023)litter size colostrum per pigletTotal number bornFunctional teat numberTraitEstimateSEP-valueEstimateSEP-valuePiglet colostrum i

6、ntake,g-27.01.90.0110.05.30.06Sow colostrum yield,g170.428.50.01323.777.90.01Piglet colostrum intake coefficient of variation,%2.00.230.01-1.40.60.03Piglet survival,%-2.20.30.012.40.90.01Knauer and Wiegert(2023)teat number colostrumTotal number bornFunctional teat numberTraitEstimateSEP-valueEstimat