[Artificial insemination in pigs: study of conception conditions with use of 2 inseminations in heat with about 24 hours interval].
140 sows and gilts of Danish Landrace were inseminated twice per heat with an interval of approximately 24 hours. Half of the females had their first insemination with semen of Danish Landrace and their second insemination with semen of Yorkshire, the other half vice versa. 114 females became pregnant. At farrowing the number of offspring of Danish Landrace and/or Danish Landrace X Yorkshire per sow/gilt was registrated. The results have been set out in tables I and II, from which it can be seen, that 59% conceived only after first insemination, 18% only after second insemination and 23% after both first and second insemination. In the last group 52% of the offspring were from the first insemination and 48% from the second insemination. In the sows no increase in av. litter size after two inseminations was found. The results are discussed and apparent discrepancy with earlier results is explained with a presumbably existing competition in the female genital tract between sperms from two inseminations at different times in the heat, resulting in ageing of the first inseminated sperms.
D000818:Animals; D004971:Estrus; D005260:Female; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary*; D008297:Male; D011247:Pregnancy; D013552:Swine; D013997:Time Factors
Kunstig saedoverføring på svin: undersogelse af konceptions-forholdene ved anvendelse af to insemineringer i brunsten med ca. 24 timers interval