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Effects of dietary amino acids in ameliorating intestinal function during enteric challenges in broiler chickens

Published on: 02/14/2020
Author/s : C. Bortoluzzi,a, J.I.M. Fernandes,b, K. Doranalli,c, T.J. Applegate,a*. a,Department of Poultry Science, University of Georgia, Athens, GA, USA. b, Department of Animal Production, Federal University of Parana, Palotina, PR, Brazil. c, Evonik Nutrition & Care GmbH, Hanau, Germany. Corresponding author. E-mail address: applegt@uga.edu (T.J. Applegate).

ABSTRACT Enteric infections such as coccidiosis and necrotic enteritis in broilers may have a large influence on the endogenous amino acids (eAA) losses within the gastrointestinal tract (GIT). Although not much is known on this topic, more information is available on the effects of these diseases on the apparent ileal digestibility (AID) of amino acids. There are many factors that must be consid...

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February 14, 2020

Dr. Cristiano, we congratulate the team involved in preparing the article, considering the information contained therein. I would like to take the opportunity of the material presented, to make some considerations regarding the implications of the practice of reducing crude protein (CP) in diets for pigs and poultry. First; - it became evident that the demand for essential amino acids, such as threonine, tryptophan and sulfur dioxide is increased in conditions of immunological challenge. Therefore, the relationships between these amino acids and lysine in the ideal protein of these animals are increased. With these facts, it became evident that the ideal protein has a dynamic character, revealing the need for adjustments in the relationships of these amino acids with lysine according to the animal's health status. Second, - the evidence that the non-essential amino acid, glutamine, can become limiting depending on the degree of the animal's immune challenge, is also a restriction to the practice of reducing crude protein in the feed. I made these considerations not in the sense that it is not feasible to reduce CP in poultry and swine diets, but in the sense that there is a need for the use of common sense when we advocate this practice. very well addressed in this article., other non-essential amino acids such as glutamate, aspartate and glycine, can also become limiting in pig and poultry diets depending on the animals' immune stress.

February 20, 2020
Juarez Donzele Sulfur dioxide? Do you mean Sulfur containing AA?
February 20, 2020
Dr Alemu, I clarify that I referred to sulfur-containing amino acids, such as methionine and cystine.
February 20, 2020
Dr. Donzele,
February 20, 2020

Under immunological challenge, the animal uses the limiting AA for the synthesis of acute phase protein and other proteins that involve in immune system development at the expense of muscle accretion leading to growth depression. Therefore, in immune compromised animals the demand for these AA increases necessitating extra supplementation of AA to keep the animals healthy and productive. However, under ideal (normal) situation increasing crude protein level will compromise gut health in that, the fermentation of extra AA produces toxic metabolites that will enhance the growth and proliferation of pathogenic microbes. Therefore, low crude protein-AA diet is recommended under healthy conditions.

February 20, 2020

Dr. Alemu, I think your considerations are consistent with those we did earlier. This consistency is more evident in his report that, in conditions of low health challenge, it is feasible to use diets with a lower level of crude protein. The reason for adopting this practice would be precisely related to the fact that healthy animals have less demand for non-amino acids. essential and that the relationships between essential amino acids and the lysine proposed in the ideal protein for the animal category would be more adjusted to their requirements. These facts are based on our report presented above.

Kazem Yussefi Kazem Yussefi
Animal Nutritionist
February 22, 2020

very interesting and practical

in challenge condition, what about metabolisable energy requirement?

Best regards
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