Digestible lysine levels obtained by two methods of formulation of diets for 22-to-42-day-old broilers

Published on: 07/05/2019
Author/s : Will Pereira de Oliveira 1, Rita Flávia Miranda de Oliveira Donzele 1, Juarez Lopes Donzele 1, Luiz Fernando Teixeira Albino 1, Marcus Vinícius de Lima Antunes 1, Paulo Henrique Reis Furtado Campos 1, Matheus Faria de Souza 1, Silvana Marques Pastore 1 / 1 Departamento de Zootecnia, Universidade Federal de Viçosa, Viçosa, MG, Brasil.

Introduction Over the years, animal nutritionists have developed alterations in the quality of diets intended for broilers aiming to increasingly adapt these diets to meet the nutritional requirements of these birds. Studies on the protein nutrition of broilers have considered the use of digestible amino acids in the formulation of diets, which makes it possible to reduce the amount of dietary pr...

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mohammad aslam mohammad aslam
Specialist in Animal Nutrition
July 5, 2019

Congratulations on such a nice article, great information. Kindly help me understand that the diets either supplemented or without supplemented industrial Lysine were isocaloric and isonitrogenous, as it seems difficult to balance energy and protein ratio to achieve 12mg/kg dig. Lysine levels without supplemented industrial Lysine.

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Alvaro Dubois Alvaro Dubois
Technical Consultant at Cargill
July 5, 2019

Congratulations to the team. This is indeed an excellent paper and demonstrates clearly how difficult it is to obtain optimum performance in broilers with diets low in crude protein. The only remark I would do is the lack of information on Gly+Ser levels. Including these two amino acids in the ones that had their minimum level (or ratio to lysine) guaranteed might have produced somewhat better results for the supplemented set of diets. There's quite an amount of information showing that these amino acids become deficient when reducing crude protein in broiler diets especially in corn+soybean vegetable diets as used in this trial. Also, the ratio of essential to non-essential amino acids would be nice information that might help the discussion of results.

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Johnny Adhinegara Johnny Adhinegara
feed producer
July 10, 2019
Yes pls elaborate more about the two different method of formulation based on Digestible Lysine levels. Thanks & rgds-Johnny A.
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July 10, 2019
Alvaro, I agree at first with the meaning of your considerations. However, it should be considered that at levels of 0.90 and 1.00% lysine the ratio of glycine + serine and that of essential and non-essential amino acids does not characterize these possible deficiencies. On the other hand, in the higher levels of lysine these factors should rather be discussed. Thank you for your contribution, in order to complement information on the subject studied.
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mohamed Elseady mohamed Elseady
Poultry consultant
July 11, 2019

The guide and the main amino acid for the broiler is lysine and also is essential for the flesh and the frame in between 0.9 to 1.2% is enough for the good performance for broiler apart from the limits in the raw materials.

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