2MARTINEZ E A,VAZQUEZ J M,ROCA J,et al.Minimum number of spermatozoa required for normal fertility after deep intrauterine insemination in non-sedated sows. Reproduc-tion . 2002
3FANTINATI P,ZANNONI A,BERNARDINI C,et al.Laparo-scopic insemination technique with low numbers of spermatozoa in superovulated pre-puberal gilts for biotechnological applica-tion. Theriogenology . 2005
4Martinez EA,Vazquez JM,Roca J,Lucas X,Gil MA,Vazquez JL.Deep intrauterine insemination and embryo transfer in pigs. Reproduction . 2001
5Vazquez JM,Martinez E A,Parrilla I,et al.B irth of p iglets afterdeep intrauterine insem ination w ith flow cytom etrically sorted boarspermatozoa. Theriogenology . 2003