The Nitrogen Requirements and Dietary Nitrogen Utilization for the Gecarcinid Land Crab Gecarcoidea natalis

2000 ◽  
Vol 73 (2) ◽  
pp. 209-218 ◽  
Author(s):  
Stuart M. Linton ◽  
Peter Greenaway
Keyword(s):  
Nitrogen Utilization ◽  
Land Crab ◽  
Dietary Nitrogen ◽  
Gecarcoidea Natalis

Urate deposits in the gecarcinid land crab Gecarcoidea natalis are synthesised de novo from excess dietary nitrogen

1997 ◽  
Vol 200 (17) ◽  
pp. 2347-2354 ◽  
Author(s):  
S Linton ◽  
P Greenaway
Keyword(s):  
Direct Evidence ◽  
De Novo ◽  
Heavy Isotope ◽  
High Nitrogen ◽  
Land Crab ◽  
Dietary Nitrogen ◽  
Dietary Period ◽  
Ad Libitum ◽  
Gecarcoidea Natalis ◽  
Low Nitrogen

The urate content of the gecarcinid land crab Gecarcoidea natalis was correlated to the amount of nitrogen assimilated. Crabs fed a high-nitrogen diet (ad libitum amounts of soy beans and fig leaves, Ficus macrophylla) for 6 weeks assimilated approximately 23 times more nitrogen (33.9±5.6mmolkg-1day-1) than animals fed a diet low in nitrogen (fig leaves alone) (1.5±0.7mmolkg-1day-1). Animals maintained on a high-nitrogen diet accumulated urate (67.1±29.4mmolkg-1drymass), while animals fed the low-nitrogen diet did not accumulate significant amounts of urate compared with the control animals killed at the beginning of the dietary period. The urate deposits clearly originate from the excess dietary nitrogen ingested on the high-nitrogen diet. The intake of preformed dietary purine was low (0.028±0.005mmolkg-1drymass) and at most could only account for 0.04% of the urate accumulated by crabs fed the high-nitrogen diet. This indicates that the urate was synthesised de novo. When crabs were fed a high-nitrogen diet supplemented with [15N]glycine, the 15N heavy isotope was incorporated into urate. This provided direct evidence that the urate was synthesised de novo.

NITROGEN UTILIZATION IN CALORIC INSUFFICIENCY

PEDIATRICS ◽  
1953 ◽  
Vol 11 (5) ◽  
pp. 435-448
Author(s):  
WARREN M. COX ◽  
RUDOLPH C. ELLINGSON ◽  
A. J. MUELLER
Keyword(s):  
Protein Hydrolysate ◽  
Caloric Intake ◽  
Tissue Growth ◽  
Nitrogen Utilization ◽  
Energy Requirements ◽  
Protein Loss ◽  
Dietary Nitrogen ◽  
Energy Needs ◽  
New Protein ◽  
Normal Stock

To determine whether a portion of ingested protein can be used for tissue growth when insufficient calories were fed, isocaloric and suboptimal amounts of calories in the form of dextrose or as dextrose and protein hydrolysate (amigen®) were fed to protein-depleted, partially starved, scalded and normal stock rats together with adequate vitamins and minerals. It is concluded that: 1. The greater the need for protein, the greater is the utilization of ingested nitrogen for new protein synthesis under conditions of caloric limitation. Protein-depleted rats are able to build new protein tissue even when basal energy requirements are not completely supplied. 2. Protein depleted, partially starved, scalded and stock animals retain or gain more weight when fed adequate or suboptimal quantities of the hydrolysate-dextrose diet than when fed isocaloric quantities of the dextrose diet. 3. Stock animals with no pre-existing protein loss, and in good nutritive condition, do not utilize dietary nitrogen for tissue building when the caloric intake is suboptimal. 4. When the caloric intake is less than that required to meet the estimated basal energy needs, a diet supplying approximately 20% of the calories as protein supported better growth than those supplying more or less than this amount.

Influence of energy supplementation on dietary nitrogen utilization and milk production in cows fed foliage of Leucaena leucocephala

2020 ◽  
Vol 52 (5) ◽  
pp. 2319-2325
Author(s):  
Víctor Adrián Arjona-Alcocer ◽  
Carlos Fernando Aguilar-Pérez ◽  
Juan Carlos Ku-Vera ◽  
Luis Ramírez-Avilés ◽  
Francisco Javier Solorio-Sánchez
Keyword(s):  
Milk Production ◽  
Leucaena Leucocephala ◽  
Nitrogen Utilization ◽  
Dietary Nitrogen ◽  
Energy Supplementation
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