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Role of Sperm Cell Dose and Post-insemination Backflow in Sows
Artificial insemination is a standard procedure in sows, but often the results are not as good as in other species. There are various reasons for this, and one of them might be that the sperm cell dose and the post-insemination semen backflow are probably underestimated, as this study shows.

This study was carried out to evaluate the effects of the sperm cell dose and semen backflow on the pregnancy rate and number of embryos of sows inseminated once at 024 h before ovulation, using an intrauterine technique.

The results were analysed from a total of 211 sows assigned to three groups inseminated with doses of 0.25 109 (T1), 0.5 109 (T2) and 1.0 109 (T3) spermatozoa.

Semen backflow was observed in 95% of the females (143/151) evaluated for this purpose.

The percentage of semen backflow is close to two-third of the volume and the percentage of sperm is around 15% of the infused sperm dose.

Intrauterine insemination can be successfully performed provided that at least 0.5 billion of sperm cell dose is infused at an interval of 024 h before ovulation.


Source: Mezalira, A, Dallanora, D, Bernardi, ML, Wentz, I & Bortolozzo, FP (2005): Influence of Sperm Cell Dose and Post-insemination Backflow on Reproductive Performance of Intrauterine Inseminated Sows. In: Reproduction in Domestic Animals 40 (1), 1-5.




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SWINE PRACTICE

Enrofloxacin and the porcine livermembers
Enrofloxacin (EF) is a widely used fluoroquinolone, usually regarded as a safe and effective treatment for bacterial infections. Adverse effects of EF have previously been demonstrated in some species, but so far there have been no studies looking specifically at the impact of EF on pigs. In this study, three different doses of EF (5, 25 and 125 mg kg bw−1) were administrated to Bama pigs.

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