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Technical note: Alternatives to reduce adipose tissue sampling bias.

G D Cruz1, Y Wang1, J G Fadel2

  • 1Department of Animal Science, University of California, Davis, CA, 95616.

Journal of Animal Science
|September 4, 2014
PubMed
Summary
This summary is machine-generated.

This study investigated sampling techniques for measuring adipocyte cellularity in cattle. Increasing sample size and using systematic sampling improved the accuracy of estimating adipose tissue characteristics.

Keywords:
adipocyte tissuebeef cattlecellularitydistributionfinite mixture model

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Area of Science:

  • Animal Science
  • Cell Biology
  • Quantitative Biology

Background:

  • Adipose tissue development is crucial for production animals, impacting enterprise profitability.
  • Adipocyte cellularity (number and size) is a key metric in animal science research.
  • Previous studies noted variability in adipocyte sampling but lacked critical investigation of techniques.

Purpose of the Study:

  • To evaluate random versus systematic sampling techniques for adipocyte cellularity.
  • To determine the minimum number of samples required for representative adipose tissue analysis.
  • To minimize sampling bias in animal science research.

Main Methods:

  • Compared random and systematic sampling on 30 cattle longissimus muscles (grass- or grain-finished).
  • Fixed adipose tissue with osmium tetroxide; determined adipocyte number/size via Coulter Counter.
  • Utilized finite mixture models and acceptance ratios to assess sampling representativeness.

Main Results:

  • Increasing sample size from 1 to 15 significantly improved estimation of adipocyte cellularity parameters for both techniques.
  • Acceptance ratios increased from ~3% to 25% with larger sample sizes.
  • Systematic sampling offered a slight improvement in parameter estimation over random sampling.

Conclusions:

  • Larger sample sizes (1-15) are essential for accurate adipocyte cellularity estimation in cattle.
  • Systematic sampling may offer marginal benefits over random sampling.
  • Further research into novel sampling techniques could enhance the accuracy of minimum sampling determination.