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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Author Spotlight: In Silico Creation and Impact of Carbonylated Amino Acids on Protein Structure and Function
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Low-Protein Diets Decrease Porcine Nitrogen Excretion but with Restrictive Effects on Amino Acid Utilization.

Liuting Wu1, Xiangxin Zhang1, Zhiru Tang1

  • 1Laboratory for Bio-feed and Molecular Nutrition, College of Animal Science and Technology , Southwest University , Chongqing 400715 , P. R. China.

Journal of Agricultural and Food Chemistry
|July 10, 2018
PubMed
Summary
This summary is machine-generated.

Reducing crude protein (CP) in pig diets lowers nitrogen excretion but impairs growth. Low-protein diets decrease nitrogen retention and may cause nonessential amino acid deficiency, a key disadvantage for growing pigs.

Keywords:
amino acidlow-protein dietmetabolismnitrogen excretionpig

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Area of Science:

  • Animal Nutrition
  • Swine Physiology
  • Nutrient Metabolism

Background:

  • Reducing dietary crude protein (CP) in pigs lowers nitrogen excretion but can negatively impact growth.
  • Essential amino acids (AA) are supplemented in low-protein diets, but other disadvantages exist.

Purpose of the Study:

  • Investigate the disadvantages of low-protein diets supplemented with specific amino acids in growing-finishing pigs.
  • Determine the effects of reduced CP on nitrogen balance and amino acid metabolism.

Main Methods:

  • Nitrogen balance was assessed in barrows fed diets with 18%, 15%, or 13.5% CP.
  • Amino acid metabolism was studied in catheterized barrows measuring portal and hepatic fluxes of ammonia and amino acids.
  • Urea production in the liver was quantified.

Main Results:

  • Low-protein diets reduced nitrogen excretion and retention.
  • Decreased portal fluxes of ammonia, glycine, and alanine were observed with lower CP diets.
  • Nonessential amino acid (NEAA) portal fluxes decreased, while essential AA uptake by the liver increased.

Conclusions:

  • Low-protein diets reduce nitrogen excretion and retention in pigs.
  • NEAA deficiency is a significant disadvantage of low-protein diets in swine.
  • Further research into optimizing NEAA levels in low-protein swine diets is warranted.