长白种猪优化选配减少近交畸形的研究

以华南某1 500头规模种猪场2009年到2010年1 502窝长白猪分娩信息进行优化、选配减少近交畸形的研究,结果显示血缘选配优化时将近交系数控制在1%比3%效果明显,平均产活仔数从10.39头/窝提高到10.46头/窝(P＞0.05),畸形率从10.30%下降到4.79%(P＜0.01);对其中402窝出现畸形仔猪...

Controlling inbreeding and anatomical abnormalities in Landrace new born piglets

1502 litter breeding records for Landrace sows were obtained from a breeding farm with 1500 sows in South China.Inbreeding coefficients relative to the anatomical abnormalities and litter size were calculated for each litter.The piglet number born alive of each sow with controlling inbreeding coefficient less than 3% and 1% were from 10.39 H/L to 10.46 H/L（p≥0.05）.The percentage of anatomical abnormalities decreased from 10.30% to 4.79%（p≤0.01）.In 402 litters with anatomical abnormalities in 2010,40.66% piglets were congenital tremors and 25.48% piglets were splay leg.Inbreeding coefficient of individual sire boar and number of anatomical abnormalities piglets per litter for 48 sows before and after controlling inbreeding were declined from 1.05% to 0.52%（p≤0.05） or from 3.10 to 1.85（p≤0.01） respectively.The results showed that the sow fertility could be improved by controlling inbreeding coefficient less than 1%.