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Long-Term Immunocastration Protocols Successfully Reduce Testicles' Size in Bísaro Pigs.

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Summary

The optimal immunocastration protocol for Bísaro pigs (BP) involves three Improvac vaccinations starting at 3 months, followed by a booster, ensuring reduced scrotal dimensions for older slaughter ages.

Keywords:
boarimmunosuppressionimprovacporkscrotal dimensions

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Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Reproductive Biology

Background:

  • Bísaro pigs (BP) possess unique breed and production system characteristics.
  • Establishing an effective immunocastration protocol is crucial for managing male pigs in specific production systems.

Purpose of the Study:

  • To determine the most suitable immunocastration protocol using Improvac for male Bísaro pigs.
  • To evaluate the impact of different vaccination timings and numbers on reproductive organ development.

Main Methods:

  • Twenty-five male Bísaro pigs were divided into groups receiving two or three Improvac vaccinations at different ages (9 or 13 weeks).
  • A control group of intact males was maintained for comparison.
  • Scrotal measurements and morphometry of testes and epididymides were assessed at slaughter.

Main Results:

  • Immunocastration temporarily reduced scrotal dimensions, with variations based on the protocol.
  • Scrotal size increased to post-pubertal levels before decreasing again after a second vaccination cycle.
  • A three-vaccination protocol initiated at 3 months of age proved most effective for older slaughter ages.

Conclusions:

  • A protocol involving three Improvac administrations, starting at 3 months and including a second cycle, is recommended for immunocastrating Bísaro pigs intended for older slaughter ages.
  • This protocol effectively manages reproductive development in male Bísaro pigs.