Intrauterine artificial insemination of swine with different sperm concentrations, parities,and methods for prediction of ovulation

This study compared the reproductive performance of sows that were submitted to cervical artificial insemination (CAI) using concentrations of 3.5 x 10 9 spermatozoa per dose or intrauterine artificial insemination (IUAI) with 2, 1, or 0.5 x 10 9 spermatozoa per dose. Within all treatments, females were inseminated either after conventional estrus detection or after ultrasound-guided ovulation diagnosis. Farrowing rate did not differ between CAI and IUAI, regardless of the concentration of spermatozoa used (P > 0.05). In comparison with CAI in parity-3+ females, the probability of failure to farrow was greater (P 0.05), but it was smaller (P 0.05). Intrauterine AI had a lower probability of farrowing with the concentration of 0.5 x 10 9 spermatozoa per dose and in parity-2 females and also reduced litter size in parity-1 females.

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