The influence of pre- and post-ovulatory insemination on sperm distribution in the oviduct,accessory sperm to the zona pellucida,fertilisation rate and embryo development in sows |
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Authors: | Kaeoket K Persson E Dalin A-M |
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Affiliation: | Department of Obstetrics and Gynaecology, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences (SLU), S-750 07 Uppsala, Sweden. kampon.kaeoket@og.slu.se |
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Abstract: | The aim of present study was to investigate the influence of pre-compared with post-ovulatory insemination, on the distribution of spermatozoa in the oviduct, the accessory sperm counts on the zona pellucida and early embryonic development. Thirty-six crossbred multiparous sows (Swedish Landrace x Swedish Yorkshire) were artificially inseminated once either at 20-15 h before (group AIB) or at 15-20 h after (group AIA) ovulation by using a pooled semen of two boars. Thereafter, they were randomly allocated to one of five groups: slaughter at 5-6h after AI (group I-AIB), at 20-25 h after ovulation (groups II-AIB and II-AIA), at 70 h after ovulation (groups III-AIB and III-AIA), on day 11 (groups IV-AIB and IV-AIA, first day of standing oestrus=day 1) and on day 19 (groups V-AIB and V-AIA).The plasma levels of oestradiol-17beta and progesterone differed significantly (P
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