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Studies on nitrogen retention in growing pigs.

G Thorbek1, S Henckel, A Chwalibog

  • 1National Institute of Animal Science, Denmark.

Archiv Fur Tierernahrung
|October 1, 1987
PubMed
Summary

Nitrogen retention in pigs varies individually. Optimal nitrogen retention (RN) depends on metabolic live weight, with high biological value (HBV) feed compounds supporting maximum retention.

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Area of Science:

  • Animal Nutrition
  • Swine Physiology
  • Nutrient Metabolism

Background:

  • Individual variation in nitrogen retention (RN) is significant in growing pigs.
  • Understanding factors influencing nitrogen retention is crucial for optimizing swine diets.

Purpose of the Study:

  • To quantify nitrogen retention in Danish Landrace barrows.
  • To investigate the relationship between nitrogen retention, feed biological value, and metabolic live weight.

Main Methods:

  • Conducted 470 nitrogen balance periods across two experimental series (Expt A and B) with 60 barrows.
  • Fed diets of high biological value (HBV) and low biological value (LBV) with varying energy levels.
  • Analyzed nitrogen retention in relation to metabolic live weight (kg^0.75).

Main Results:

  • Observed 10-20% individual differences in nitrogen retention capability.
  • Nitrogen retention increased with HBV compounds (12-21 g N/d) and was independent of nitrogen/energy intake.
  • Developed parabolic regression models for nitrogen retention based on metabolic live weight for both HBV and LBV diets.

Conclusions:

  • Nitrogen retention is curvilinearly related to metabolic live weight in growing pigs.
  • High biological value feed compounds maximize nitrogen retention, with optimal levels identified at specific live weights.
  • Individual variability necessitates consideration in formulating swine nutrition strategies.

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