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Related Experiment Videos

Breeding objectives for Targhee sheep.

R C Borg1, D R Notter, L A Kuehn

  • 1Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA.

Journal of Animal Science
|July 5, 2007
PubMed
Summary
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Breeding objectives for Targhee sheep prioritize increasing lamb crop and weaning weight for profitability, especially under low feed costs. Selection indexes are tailored to production conditions, balancing traits like yearling weight with economic factors.

Area of Science:

  • Animal Science
  • Quantitative Genetics
  • Agricultural Economics

Background:

  • Targhee sheep breeding objectives require optimization for rangeland production.
  • Economic viability depends on balancing multiple production and cost factors.

Purpose of the Study:

  • To develop breeding objectives and selection indexes for Targhee sheep.
  • To evaluate the economic impact of genetic trait changes on rangeland production.

Main Methods:

  • Utilized a bioeconomic model to assess the impact of EPD changes on performance and economics.
  • Derived selection indexes considering prolificacy, survival, lamb pricing, and forage costs.
  • Analyzed effects of direct and maternal weaning weight, yearling weight, and fleece traits.

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Main Results:

  • Increasing percent lamb crop (PLC) and weaning weight (WW) significantly impacts profitability.
  • Optimal PLC increases are recommended, but decline with very high litter sizes and low triplet survival.
  • Yearling weight (YW) increases can reduce profitability due to higher maintenance costs.

Conclusions:

  • Selection indexes should be tailored to specific production systems (e.g., rangeland vs. intensive).
  • Balancing PLC and WW is crucial, with YW increases needing careful consideration.
  • Economic factors like feed costs and lamb pricing policies heavily influence optimal genetic trends.