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Effects of balancing low protein diets with supplemental amino acids on performance and carcass composition of growing-finishing pigs

Published on: 01/09/2019
Author/s : Dr. John Htoo, Evonik Nutrition & Care GmbH, Animal Nutrition, Germany

Conclusions Reducing the dietary crude protein (CP) level and balancing with supplemental amino acids (AA) maintained optimal performance and carcass quality of growing-finishing pigs compared with feeding high CP diet. Plasma urea nitrogen concentration decreased linearly when dietary CP was reduced, indicating a better balanced AA supply with less excessive AA being Nitrogen (N) retention (g...

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January 9, 2019

Excellent work, even with results consistent with those that we verified in research that we conducted evaluating the reduction of protein in pig rations at different stages of production. However, I would like to make a few points which I consider relevant. First - it is important to consider that in the environment in the production unit, the animals are normally exposed to greater immunological challenge. In this case, protein reduction may compromise animal performance, since the reduction of non-essential amino acids, such as glutamate, aspartate, glycine, glutamine, by its recognized actions in the immune system, may limit the defense system of animals and consequently their performance. Second, it is known that the digestion of soy protein results in the production of various peptides, which are functional, with the action, for example, of increasing the phagocytic capacity of neutrophils.

January 11, 2019
Juarez Donzele
Do you think and/or do you have certain requirements of these NEAA for low protein diets? Or are you just suggesting the usage of ingredients high in glutamine and glutamate for low protein diets? There are studies though showing some benefits of MSG and l-glutamine even on diets with standard protein levels.
January 12, 2019

My position was that in practical conditions where immunological challenges are greatest, and consequently the demand for a certain pool of amino acids is considered to be non-essential and increased, the possibility of protein reduction of the feed is limited.

In addition to this, it should be considered that gastrointestinal digestion of protein sources produces a variety of peptides with functional action that may favor the animal.

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Jon Bergstrom
Jon Bergstrom
Swine Nutrition & Production, Ph.D.
  Plano, Texas, United States
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