Anjan Mondal, I WOULD LIKE TO MAKE SOME CONSIDERATIONS; -In the item strategies for modulating the intestinal flora, in the second paragraph, I think that the effect of increasing the grain size on the gizzard size is not the increase in the motility of the intestine, which would not even have a positive effect on the digestibility of nutrients as mentioned. I believe that the increase in the size of the gizzard due to the increase in the grain size of the ration, does improve the digestibility of the food, due to the retrograde movement of the digesta from the intestine to the gizzard. ; - In the fourth paragraph, he reported a negative effect of soy overheating on protein digestibility, without explaining the reason for this effect. Overheating due to changing the configuration of part of the amino acids from L to the D isomer, which results in a decrease in the efficiency of use of the protein, since only the D-methionine isomer is efficiently used. This occurs due to the absence of some and little activity of others D amino acid oxidase that is specific for each amino acid: - The fifth paragraph seems to be repetitive, since it is again the effect of the granulometry of food.; - In the sixth paragraph, the effect negative of NSPS is exactly due to the increase in viscosity, which by decreasing the fluidity of the digestion in the intestine impairs the diffusion of pancreatic digestive enzymes, which compromises digestibility. Another detail to consider. of water, which if it is above the recommended decreases its consumption compromising the consumption of feed and consequently the performance of the animals My intention was to present suggestions that can contribute to improve the understanding of the material presented.