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Risk factors for perinatal and postnatal mortality in lambs

M L Nash1, L L Hungerford, T G Nash

  • 1Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Illinois, Urbana 61801, USA.

The Veterinary Record
|July 20, 1996
PubMed
Summary

Low birth weight, unmonitored birth locations, and multiple births significantly increase perinatal lamb mortality. Lamb vigor and dam

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Area of Science:

  • Veterinary Science
  • Animal Husbandry
  • Reproductive Biology

Background:

  • Preweaning mortality in lambs is a significant concern for the sheep industry.
  • Understanding risk factors is crucial for improving lamb survival rates.

Purpose of the Study:

  • To identify key factors associated with perinatal and postnatal mortality in lambs.
  • To develop risk profiles for predicting lamb mortality using logistic regression.

Main Methods:

  • Logistic regression models were employed to analyze factors influencing perinatal and postnatal mortality.
  • Data included birth weight, lambing location, multiple births, breed, lamb vigor, dam's milk supply, and castration status.

Main Results:

  • Low birth weight, unmonitored lambing locations, and multiple births were associated with increased perinatal mortality.

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  • Lamb vigor and dam's milk supply significantly impacted postnatal mortality.
  • Castration at 30 days reduced postnatal mortality risk in male lambs.
  • Breed-specific risks were identified for both perinatal and postweaning mortality (e.g., Targhee, Suffolk).

    • Conclusions:

    • Several factors, including birth weight, birth location, and lamb vigor, are critical determinants of preweaning lamb survival.
    • Targeted management strategies based on these identified risk factors can help mitigate lamb mortality.
    • Breed-specific considerations are important for effective lamb mortality reduction programs.