Effect of Quantity and Source of Dietary Nitrogen on the Utilization of the Hydroxy Analogues of Methionine and Glycine by Chicks

Equivalence of Methionine Hydroxy Analog and Methionine for Chickens Fed Low-Protein Diets

“…The explanation for the difference between our results and those of Sullivan and Bird (1957) although not apparent is probably related to the extremely poor and erratic growth observed with these diets.…”

“…Since we had not used the exact diet of Sullivan and Bird (1957) in this experiment it was thought that this might account for the discrepancy in results between the two laboratories. Therefore in the remainder of the experiments their diet was used with no modification.…”

“…The basal diet used in the * A preliminary report has been presented (Poultry Sci. 36: 1137, 1958 first experiment was a modification of the 12% protein diet used previously (Sullivan and Bird, 1957). The main difference was the use of corn oil instead of soybean oil and the use of a different mineral mixture (Briggs et al, 1952).…”

“…Sullivan and Bird (1957) however, have reported that MHA as a supplement to diets containing only 12 to 14% protein failed to support growth equivalent to DL-methionine, unless nitrogen from diammonium citrate (DAC) or urea was added to these diets. In the experiments presented we have found that even with a low protein level the growth response to MHA and DL-methionine were equivalent.…”

Utilisation of dried poultry manure by growing chickens fed on a practical diet

“…Sullivan and Bird (1957) showed that chicks utilised NPN when methionine and glycine were replaced by their hydroxy analogues while Featherstone et al (1962) has shown that non-essential amino acids were synthesised when the diet contained all the essential ones.…”