Tryptophan requirement of 22 to 34-week-old caged-laying hens
Published: February 21, 2020
Related topics:
Authors:
Recommend
Comment
Share
Would you like to discuss another topic? Create a new post to engage with experts in the community.
Juarez Donzele,
Great question, this experiment was a classical requirement experiment so both D Lys and D SAA were supplied in excess of the hens requirements so that Trp would be the limiting nutrient for egg production.
Mike.
Dr. Mike, I appreciate your prompt reply. In this case, the tryptophan requirement must be established in grams/day, making no reference to its relationship with lysine. Do I think correctly?
Dear Juarez Donzele, I have to admit that I haven't followed the entire discussion herein but noticed the statements on D-isomers of amino acids. Indeed, the nutritional value of D-Lys (and others) is very limited in farm animals and therefore all supplemental amino acids - except methionine - are available as L-isomer only. Methionine indeed behaves different and as the D-isomer of methionine is highly, if not completely, available as building block to farm animals, the racemate of D- and L-methionine has become the gold standard in animal nutrition. Moreover, even if given as D-methionine only, transformation into animal performance is as effective as with L-Met. BR Andreas
Dr. Andreas Lemme Dr. Lemme, would you please help me with the literature reference(s) supporting the concept that D-methionine has similar biological activity as DL-methionine, and perhaps as L-methionine? It would be highly appreciated.
.jpg&w=3840&q=75)
.jpg&w=3840&q=75)
.jpg&w=3840&q=75)
