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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

Oral fluid and plasma oxytetracycline concentrations after i.m. administration in pigsmembers
The penetration of oxytetracycline (OTC) into the oral fluid and plasma of pigs and correlation between oral fluid and plasma were evaluated after a single intramuscular (i.m.) dose of 20 mg/kg body weight of long-acting formulation. An important study regarding one of the most popular long-acting antibiotics in pigs.

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