Frozen boar semen: effect of volume of semen and number of inseminations on pregnancy in the sow
Pursel, V.G.; Johnson, L.A.
Proceedings, International Pig Veterinary Society, 4th International Congress, Ames, June 22-24, 1976: ; D19
For 4 groups each of 28 primiparous Duroc and Yorkshire sows inseminated with 6X109 thawed spermatozoa given in (1) a single 50-ml dose 32-42 h after oestrus detection, (2) a single 100-ml dose 32-42 h after oestrus detection, (3) two 50-ml doses (each of 3X109 spermatozoa) 24 and 32 or 42 h after oestrus detection, and (4) two 100-ml doses (each of 3X109 spermatozoa) 24 and 32 or 42 h after oestrus detection, the pregnancy rate was 50, 71, 43 and 46%, the number of live embryos at slaughter 30 days after insemination averaged 9.3, 9.1, 8.7 and 8.1, and the number of dead embryos 0.9, 0.2, 0.8 and 0.6. The effects of semen volume and number of inseminations per oestrous period on pregnancy rate and number of embryos per sow were not significant, although the finding that 100 ml semen gave a higher pregnancy rate than did 50 ml agrees with earlier work involving fresh semen.