Utilization of D- and L-Tryptophan by the Growing Dog2

Publisher Website
Google Scholar
Abstract
Two 4 X 4 Latin square experiments were conducted with English Pointer puppiesto determine the growth promoting capacity of D- tryptophan (trp) relative to L-trp and to estimate the trp requirement of the growing dog. Based upon a multiple linear regression slope-ratio technique, D-trp had an efficacy value of 35.5 ± 6.4% of the ingested trp; no measurable trp was recovered in the urine of dogs fed L-trp. The trp requirement for maximal weigt gain was at least .16% for 6-to 10-wk-old dogs, between .12 and .16% for 10- to 12-wk-old dogs and <.12% for 12- to 14-wk-old dogs. The overall requirement for the 6- to 14-wk age period was .15%. Total N, as well as urea-, in urine decreased and N retention increased with increasing levels of dietary L-trp; NH3-N, creatinine-N and fecal-N were unaffected by treatment. Copyright © 1982. American Society of Animal Science . Copyright 1982 by American Society of Animal Science.

This publication has 0 references indexed in Scilit: