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Using Longitudinal Assessment on Extensively Managed Ewes to Quantify Welfare Compromise and Risks.

Carolina Munoz1, Angus Campbell2, Stuart Barber3

  • 1Animal Welfare Science Centre, The University of Melbourne, North Melbourne, VIC 3051, Australia. cmunoz@student.unimelb.edu.au.

Animals : an Open Access Journal From MDPI
|January 11, 2018
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Summary

Extensively managed ewes showed variable welfare, with key issues including body condition, dags, lameness, and mastitis. Improved management practices can mitigate these welfare risks in sheep farming.

Keywords:
animal welfareanimal-based indicatorson-farm welfare assessmentsheep

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Area of Science:

  • Animal Science
  • Veterinary Medicine
  • Sheep Production

Background:

  • Extensive sheep management systems present unique challenges for animal welfare assessment.
  • Understanding welfare variations is crucial for optimizing production and ethical considerations in sheep farming.

Purpose of the Study:

  • To investigate the welfare status and identify potential risks in extensively managed Merino ewes.
  • To evaluate animal-based welfare measures across different production stages.

Main Methods:

  • Individually monitored 100 Merino ewes (2-4 years old) at pregnancy, lactation, and weaning.
  • Assessed eight welfare indicators: flight distance, body condition score (BCS), fleece condition, skin lesions, tail length, dag score, lameness, and mastitis.
  • Analyzed data using ANOVA and McNemar's statistics.

Main Results:

  • Average BCS met industry recommendations, but some ewes were under or overfed.
  • High prevalence of heavy dags (87%) at mid-lactation and lameness (14%) at weaning.
  • Annual clinical mastitis rate was 1%, with five ewes lost during the study.
  • Ewe health was better during mid-pregnancy than mid-lactation or weaning.

Conclusions:

  • Key welfare concerns include nutritional status, mortality, lameness, ectoparasites (flystrike), and mastitis.
  • These issues are amenable to improvement through enhanced farm management strategies.
  • Welfare assessment in extensive systems must account for significant on-farm variations.