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Related Experiment Videos

Long-acting selenium treatments for sheep.

G J Judson1, N J Ellis, B R Kempe

  • 1Central Veterinary Laboratories, Department of Agriculture, Adelaide, South Australia.

Australian Veterinary Journal
|August 1, 1991
PubMed
Summary

Long-lasting selenium supplementation in ewes using intraruminal pellets or subcutaneous depots effectively boosted blood selenium levels for over 200 weeks. This improved selenium status in lambs for up to six months.

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Area of Science:

  • Animal Nutrition
  • Veterinary Science
  • Trace Element Metabolism

Background:

  • Selenium (Se) is an essential trace element crucial for animal health and immune function.
  • Maintaining adequate selenium status in livestock is vital for productivity and disease prevention.
  • Pasture-based systems can lead to variable selenium intake, necessitating supplementation strategies.

Purpose of the Study:

  • To evaluate the long-term efficacy of two different selenium (Se) supplementation methods in ewes.
  • To determine the duration of elevated blood Se concentrations achieved through intraruminal pellets and subcutaneous depots.
  • To assess the impact of maternal Se supplementation on the Se status of lambs.

Main Methods:

  • Ewes were administered either an intraruminal Se pellet or a subcutaneous depot of barium selenate (1.6 mg Se/kg body weight).

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  • Blood Se concentrations were monitored over an extended period (at least 200 weeks).
  • The Se status of lambs born to supplemented ewes was assessed for 4 to 6 months post-lambing.

    • Main Results:

    • Both intraruminal Se pellets and subcutaneous barium selenate depots maintained elevated blood Se concentrations in ewes for over 200 weeks.
    • Maternal supplementation significantly enhanced the Se status of lambs for 4 to 6 months.
    • The treatments proved effective in establishing a sustained increase in selenium levels.

    Conclusions:

    • Intraruminal Se pellets and subcutaneous barium selenate depots are effective long-term selenium supplementation strategies for ewes.
    • These methods can successfully improve the selenium status of lambs through maternal transfer.
    • Sustained selenium supplementation in breeding ewes offers a viable approach to enhance offspring selenium levels.