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Effect of Transportation and Relocation in Post-Weaning Anoestrous Primiparous Sows

Acta Veterinaria Scandinavica volume 30, pages 1–8 (1989)Cite this article

Abstract

The object of this investigation was to study the clinical and endocrine responses to transportation and relocation in 8 post-weaning anoestrous sows. They had been anoestrous for at least 24 days after weaning before transportation/relocation was performed. Laparoscopy, performed at the beginning of the experiment, revealed that the ovaries contained many follicles (≤ 6 mm in diameter), but no corpora lutea. Blood samples, taken before and after transportation/relocation, showed that LH activity was low at the beginning of the experiment and increased after transportation/relocation in the majority of the sows. Peripheral plasma concentrations of oestradiol-17β increased 1–4 days after transportation/relocation in 6 out of 8 sows which was followed by oestrus and ovulation. Progesterone concentrations were also below the practical detection limit until the end of oestrus. This study has demonstrated that a change in environment by transportation and relocation can induce oestrus by increasing the LH activity in post-weaning anoestrous sows.

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Acknowledgements

This work was supported by grants from the Swedish Council for Forestry and Agricultural Research. A scholarship awarded to S. Rojanasthien by the Swedish Institute is acknowledged.

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Authors and Affiliations

  1. Department of Obstetrics and Gynaecology and Department of Clinical Chemistry, College of Veterinary Medicine, Swedish University of Agricultural Sciences, P. O. Box 7039, S-750 07, Uppsala, Sweden

    S. Rojanasthien

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Rojanasthien, S. Effect of Transportation and Relocation in Post-Weaning Anoestrous Primiparous Sows. Acta Vet Scand 30, 1–8 (1989). https://doi.org/10.1186/BF03548062

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Acta Veterinaria Scandinavica

ISSN: 1751-0147