Response of broilers to digestible sulfur amino acids and threonine intake: Maximum economic return

Matheus and Team, Congratulations for this paper. A clear example of the importance of selecting the correct model to implement precise nutrition. Kudos!

Nutritionists should pay attention to both EAAs and so-called NEAAs in diets to maximize economic returns in animal production. The ratio of NEAAs to EAAs in the body of animals (eg, pigs and chickens) is 60:40. We should not ignore the more abundant group of amino acids in animal nutrition and feeding.

Congratulations to the authors for publishing such a nice research in Engormix. One remark that could be done, is that based on this design, it's not possible to define an ideal ratio of these amino acids to lysine, since lysine is in excess (as other amino acids). With enough trials with many different amino acids you might eventually get there but a different design might be more interesting. Once you have defined ideal protein ratios, economical optimization have to be decided based on responses to variation on the level of ideal protein that optimizes the economical return. I recognize that ideal protein ratios are not fixed but vary with age, breed and gender, especially. Ideally, they should be determined using mechanistic models, like the one developed by some of the authors at UNESP in Brazil. Please don't take this as a criticism. Just exploring some other aspects related to this research. This is not really a right or wrong issue.

Yes of course What is the difference between NEAAs and EAAs ?