The Pregnancy Rate After Using Asic'S ∑UiTM Hydraulic Injection Insemination System

摘要

During the last decade, Infra-Uterine Insemination (IUI) has been developed and used both for research and practice on farm. The benefits of using IUI technique are not only to reduce the number of spermatozoa (1-2 × 109/dose) used at insemination (getting more sows to be inseminated) but also to diminish semen back flow and sperm losses after insemination. In pigs, it has been shown that the optimal insemination time in order to achieve a good fertilisation rate is within 24 h before ovulalion. The ability of a pig oocyte to be fertilised has been considered to be as short as 8-12 h after ovulation. Subsequently, insemination after ovulation results in impaired farrowing rate and litter size. In addition, it is well documented that the sows with a longer weaning-to-oestrus interval (WOI) had a shorter duration of oestrus, consequently had a shorter ovulation time (i.e. a shorter time from standing oestrus to ovulation). In other word, the sows with a shorter weaning-to-oestrus had a longer duration of oestrus, consequently had a longer ovulation time. For that reason, the timing of AI should be adjusted by using the WOI. Nevertheless, no study has been published on the relationship of WOI and timing of AI by using ASIC'sΣUI? Hydraulic Injection Insemination System. Its catheter contains a membrane tube (see picture) inside a foam tip which able to easily go through cervix by pressing a bottle of semen and without damaging to the cervix. Therefore, the aim of the present study was to investigate the efficacy of using ASIC's ΣUI? Hydraulic Injection Insemination System on the pregnancy rate after adjusted timing of AI with WOI.