后备配种条件对托佩克大白猪首胎繁殖成绩的影响

文章通过分析托佩克大白头胎母猪初配日龄、体重、背膘和分娩前体重、背膘以及妊娠期间背膘和体重的变化与首胎繁殖成绩的关系发现,托佩克大白猪繁殖最佳条件为:配种日龄为239~245日龄,配种体重为150~160 kg,妊娠期间体重增加88~95 kg,分娩前体重为240~250 kg,配种背膘为14~20 mm,妊娠期间背膘增加2~4 mm,分娩背膘为18~22 mm。

Analysis of the infl uence factors on the preservation of porcine semen with antioxidants

we analyzed the age,body weight,backfat of sow’s first time breeding,body weight and back fat before delivery and during pregnancy about Topigs Norsvin Yorkshire,and studied their relationship with reproductive of first parity,then we found the optimal conditions for Topigs Norsvin Yorkshire as following:the breeding age 239-245 day,breeding weight 150-160 kg,gestational weight gain 88-95 kg,farrowing weight 240-250 kg,breeding backfat 14-20 mm,gestational backfat gain 2-4 mm,farrowing backfat 18-22 mm.