The protein requirement of adult marmosets: Nitrogen balances and net protein utilization of milk proteins, soy protein, and amino acid mixtures

1989 ◽  
Vol 28 (2) ◽  
pp. 142-148 ◽  
Author(s):  
H. Zucker ◽  
C. I. Flurer
Keyword(s):  
Amino Acid ◽  
Soy Protein ◽  
Milk Proteins ◽  
Protein Requirement ◽  
Protein Utilization ◽  
Amino Acid Mixtures ◽  
Net Protein

EFFECT OF STEAM PELLETING AND REGRINDING ON THE DIGESTIBILITY OF PROTEIN IN CEREAL GRAINS, SOYBEAN MEAL AND WHEAT BRAN BY THE RAT

1968 ◽  
Vol 48 (1) ◽  
pp. 35-39 ◽  
Author(s):  
E. M. Olsen ◽  
S. J. Slinger
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Wheat Bran ◽  
Soybean Meal ◽  
Protein Digestibility ◽  
Essential Amino Acids ◽  
Cereal Grains ◽  
Protein Utilization ◽  
Amino Acid Availability ◽  
Net Protein

The effect if steam pelleting and regrinding on digestibility of protein in corn, wheat, barley, oats, soybean meal and wheat bran was tested with rats. Percentage amino acid absorption and net protein utilization (NPU) were determined for the wheat bran. Pelleting and regrinding improved the digestibility of protein in bran but had no effect on the digestibility of protein in the other ingredients tested. Increased absorption of amino acids caused by the increased digestibility of protein in bran varied considerably for individual amino acids, being greatest for isoleucine, lysine, methionine and threonine of the essential amino acids. The improvement in protein digestibility and amino acid availability was reflected in a higher NPU.

The Protein Requirement of the Growing Chick Determined with Amino Acid Mixtures

1960 ◽  
Vol 71 (3) ◽  
pp. 209-212 ◽  
Author(s):  
G. J. Klain ◽  
D. E. Greene ◽  
H. M. Scott ◽  
B. Connor Johnson
Keyword(s):  
Amino Acid ◽  
Protein Requirement ◽  
Amino Acid Mixtures

Variation in the apparent sensitivity of the insulin-mediated inhibition of proteolysis to amino acid supply determines the efficiency of protein utilization

1998 ◽  
Vol 95 (6) ◽  
pp. 725-733 ◽  
Author(s):  
Amelia FEREDAY ◽  
Neil R. GIBSON ◽  
Malcolm COX ◽  
Paul J. PACY ◽  
D. Joe MILLWARD
Keyword(s):  
Protein Synthesis ◽  
Amino Acid ◽  
Insulin Level ◽  
Protein Requirement ◽  
Protein Utilization ◽  
Low Protein ◽  
Normal Individuals ◽  
Protein Feeding ◽  
Amino Acid Concentrations ◽  
Stimulation Of

1. The variability between normal individuals in the efficiency of postprandial protein utilization (PPU), a determinant of the apparent protein requirement, was examined in relation to the relative responses of protein synthesis and proteolysis to protein feeding by means of [1–13C]leucine turnover and balance studies. 2. Twenty-five healthy adults were infused intravenously with l-[1-13C]leucine continuously for 9 h. This was started in the postabsorptive state (PA, 3 h) and followed by low-protein feeding (LP, 3 h), and then by isoenergetic high-protein feeding (HP, 3 h). This allowed protein intake to be varied against a constant postprandial insulin level so that the extent of any amino-acid-mediated responses which were additional to those exerted by insulin could be investigated. Leucine oxidation, O, and balance (intake-oxidation), protein synthesis, S, and degradation, D, were calculated from plasma [1-13C]α-ketoisocaproic acid enrichment and 13CO2 excretion. 3. PPUprotein, calculated as change in leucine balance/change in intake (HP-LP), varied from 0.58 to 0.99 (mean = 0.81±0.10), independently of age or sex. PPUprotein varied directly with the inhibition of D and inversely with the increase in leucine concentration and stimulation of O and S. 4. Efficient PPU, as demonstrated by the top quintile of individuals categorized in terms of PPUprotein, involves maximal inhibition of D by protein feeding with minimal increases in free amino acid concentrations, O and S. Lesser inhibition of D and greater stimulation of S and O characterized the lower, less efficient quintile. This indicates that the efficiency of protein utilization in individuals, and a component of their apparent protein requirement, is determined by the sensitivity of the insulin-mediated inhibition of proteolysis to amino acid supply.

The Pepsin-Digest-Residue (PDR) Amino Acid Index of Net Protein Utilization

1956 ◽  
Vol 60 (1) ◽  
pp. 105-120 ◽  
Author(s):  
A. Leonard Sheffner ◽  
Gladys A. Eckfeldt ◽  
Harry Spector
Keyword(s):  
Amino Acid ◽  
Protein Utilization ◽  
Amino Acid Index ◽  
Net Protein ◽  
Acid Index
Sign in / Sign up

Export Citation Format

Share Document