分娩限位栏PIC母猪的死胎分析

Analysis of stillbirth of PIC sows in farrowing crate

为降低PIC（Pig Improvement Company）祖代母猪的死胎率,从云南省某中美合资PIC猪场收集了2004—2008年6 415窝母猪的产仔资料,分析胎次、分娩年份、分娩季节,分娩年份×分娩季节的互作和产仔总数对每窝仔猪死胎数（Number of Stillborn,NSB）和产活率（Percentage of Born Alive,PBA）的影响。结果表明：胎次对NSB有显著影响（P〈0.05）,分娩季节和总产仔数对NSB有极显著的影响（P〈0.001）,而分娩年份对此没有影响（P〉0.05）。此外,分娩年份对PBA有显著影响（P〈0.05）,而分娩季节、分娩季节与分娩年份的互作及总产仔数对PBA也有极显著影响（P〈0.001）。冬春季节分娩的母猪中仔猪的PBA相对夏秋季节较高（90.6~90.8 VS83.4~88.0）。NSB和PBA的最小二乘均值随母猪产仔总数（TBN）的增加有上升趋势。

To decrease the piglet stillbirth rate of PIC（Pig Improvement Company）sows,a longitudinal study was conducted to collect sow reproductive performance data from 6 415 litters in a Sino-U.S.joint venture swine farm from 2004 to 2008.The effects of parity,farrowing year,farrowing season,farrowing year × farrowing season interaction and total number born on number of stillborn（NSB） and percentage of born alive（PBA） were analyzed.Results of variance analysis indicated that farrowing season and total number of born had highly significant difference in NSB（P〈0.001）,and parity had significant difference in NSB（P〈0.05）,but not farrowing year（P〉0.05）.Farrowing year had significant difference in PBA（P〈0.05）,and farrowing seasons,the farrowing year × farrowing season interaction and total number of piglet born had highly significant difference in PBA（P〈0.001）.The sow farrowed in Spring and Winter had higher PBA（90.6%-90.8%）than that of in Summer and Autumn（83.4%-88.0%）.Moreover,there was an increasing trend of least square means for NSB and PBA with an increase with total number born.