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Nitrogen retention in the pig

J R Carr, K N Boorman, D J Cole

    The British Journal of Nutrition
    |March 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study examines how nitrogen retention (NR) in pigs changes with body weight (W) and nitrogen intake. Results provide equations to estimate protein requirements and understand nitrogen utilization efficiency across different pig weights.

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    Area of Science:

    • Animal Nutrition
    • Swine Physiology
    • Nutrient Metabolism

    Background:

    • Understanding nitrogen retention (NR) is crucial for optimizing pig growth and feed efficiency.
    • Previous studies have explored the relationship between body weight (W) and nitrogen balance, but precise modeling across a wide weight range is needed.

    Purpose of the Study:

    • To develop predictive models for maximal nitrogen retention (NR) in pigs based on body weight (W).
    • To estimate nitrogen requirements for maintenance in pigs.
    • To investigate the influence of body weight and nitrogen intake on protein utilization efficiency.

    Main Methods:

    • Analysis of published results on nitrogen retention (NR) in pigs.
    • Development of curvilinear and rectilinear regression equations to model NR as a function of body weight (W).

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  • Regression analysis to determine nitrogen requirements for maintenance and assess protein utilization efficiency.

    • Main Results:

    • Established distinct equations for maximal NR in pigs for different body weight ranges (1.5–45 kg and 45–165 kg).
    • Derived an estimate for nitrogen requirements for maintenance of 246 ± 19 mg/d per kg W0.75.
    • Demonstrated that net protein utilization is largely independent of W at low N intakes, while gross efficiency is influenced by both W and N intake.

    Conclusions:

    • The derived equations accurately predict protein requirements across various pig weights.
    • This research provides a refined understanding of nitrogen metabolism and requirements in growing pigs.
    • Findings can inform more precise dietary strategies for swine production to improve nitrogen utilization.