scholarly journals Increased dietary protein or free amino acids supply for heat stress pigs: effect on performance and carcass traits

2018 ◽  
Vol 96 (4) ◽  
pp. 1419-1429 ◽  
Author(s):  
A Morales ◽  
M Chávez ◽  
N Vásquez ◽  
J K Htoo ◽  
L Buenabad ◽  
...  
Keyword(s):  
Amino Acids ◽  
Heat Stress ◽  
Dietary Protein ◽  
Free Amino Acids ◽  
Free Amino ◽  
Carcass Traits

Dietary regulation of intestinal transport of the dipeptide carnosine

1988 ◽  
Vol 255 (2) ◽  
pp. G143-G150 ◽  
Author(s):  
R. P. Ferraris ◽  
J. Diamond ◽  
W. W. Kwan
Keyword(s):  
Amino Acids ◽  
Cell Surface ◽  
Dietary Protein ◽  
Free Amino Acids ◽  
Free Amino ◽  
Intestinal Transport ◽  
Dietary Regulation ◽  
Dietary Protein Level ◽  
Low Protein ◽  
Hydrolysis Of

Uptake of the dipeptide L-carnosine was measured in everted intestinal sleeves of mice whose dietary protein level or else proportion of protein in the form of free amino acids was varied experimentally. Carnosine uptake was highest in the jejunum, regardless of ration. Compared with a low-protein (18%) ration, a high-protein (72%) ration stimulated carnosine uptake by 30-70% in duodenum and jejunum (but not in ileum). This stimulation was observed even in the presence of peptidase inhibitors that inhibit cell surface hydrolysis of dipeptides. Measured carnosine hydrolysis was low or negligible. Carnosine uptake was the same in mice fed 54% unhydrolyzed casein, 54% partly hydrolyzed casein, and 54% free amino acids formulated so as to stimulate a complete hydrolysate of casein. Thus carnosine uptake is regulated by dietary levels of amino acids, peptides, and proteins, all of which seem equally effective at inducing carnosine transporters.

Effect of Fasting and Level of Dietary Protein on Free Amino Acids in Pig Plasma2

1965 ◽  
Vol 24 (2) ◽  
pp. 368-372 ◽  
Author(s):  
L. R. Richardson ◽  
F. Hale ◽  
S. J. Ritchey
Keyword(s):  
Amino Acids ◽  
Dietary Protein ◽  
Free Amino Acids ◽  
Free Amino

Serum concentrations of free amino acids in growing pigs exposed to diurnal heat stress fluctuations

2017 ◽  
Vol 69 ◽  
pp. 69-75 ◽  
Author(s):  
Miguel Cervantes ◽  
Nely Ibarra ◽  
Nydia Vásquez ◽  
Francisco Reyes ◽  
Ernesto Avelar ◽  
...  
Keyword(s):  
Amino Acids ◽  
Heat Stress ◽  
Free Amino Acids ◽  
Free Amino ◽  
Growing Pigs ◽  
Serum Concentrations

Effect of heat stress on the serum concentrations of free amino acids and some of their metabolites in growing pigs1

2016 ◽  
Vol 94 (7) ◽  
pp. 2835-2842 ◽  
Author(s):  
A. Morales ◽  
S. E. M. Cota ◽  
N. O. Ibarra ◽  
N. Arce ◽  
J. K. Htoo ◽  
...  
Keyword(s):  
Amino Acids ◽  
Heat Stress ◽  
Free Amino Acids ◽  
Free Amino ◽  
Serum Concentrations

The effect of dietary protein quality on free amino acids in plasma, muscle and liver of growing chickens

1993 ◽  
Vol 57 (2) ◽  
pp. 309-318 ◽  
Author(s):  
I. Fernández-Figares ◽  
M. Lachica ◽  
L. Pérez ◽  
R. Nieto ◽  
J. F. Aguilera ◽  
...  
Keyword(s):  
Amino Acids ◽  
Glutamic Acid ◽  
Dietary Protein ◽  
Free Amino Acids ◽  
Free Amino ◽  
Protein Quality ◽  
Sole Source ◽  
Metabolizable Energy ◽  
Low Protein ◽  
Protein Diets

AbstractFree amino acid (AA) levels in plasma, muscle and liver were measured in growing chickens given either high or low protein diets varying in quality. In experiment 1, they were force-fed once a day (09.00 h), for 4 days, at about 1·5 × M level, a nitrogen-free (NF) diet and then, on day 5, they were given either diet NF or isoenergetic (13·1 kj metabolizable energy (ME) per g dry matter (DM)) and isonitrogenous high protein diets (200 g crude protein (CP) per kg) based on casein (C), lupin (L), soya bean (SB), faba bean (FB), field pea (FP), vetch (V) or bitter vetch (B) as the sole source of protein. In experiment 2, chickens were force-fed twice a day (09.00 h and 18.00 h), for 3 days, at about 1·9 × M level, with four isoenergetic (13·1 k) ME per kg DM) and isonitrogenous low protein diets (120 g CP per kg) based on SB, FP, V or B as the sole source of protein. On days 5 (experiment 1) and 4 (experiment 2) samples of plasma, muscle and liver were taken for AA analysis over 3 to 4h after morning meal.In general, within experiments, no significant differences in AA concentrations in plasma, muscle or liver among diets were found. However, there was a qualitative but not a quantitative agreement between the AA abundance in tissues and the AA rank of dietary protein. Moreover, when pooling data from experiments 1 and 2, significant regressions were found between the levels of threonine, aspartic acid, glutamic acid, glycine and proline in plasma, of lysine, alanine, glutamic acid, glycine and proline in muscle or that of proline in liver and the corresponding amounts ingested with the different diets. Under the conditions of these experiments, however, it was not possible to establish conclusively a direct relationship between the level of free amino acids in tissues and dietary protein quality.

scholarly journals Influence of Age and Dietary Protein on Certain Free Amino Acids in Chick Blood Plasma

1963 ◽  
Vol 42 (1) ◽  
pp. 140-146 ◽  
Author(s):  
C.E. Askelson ◽  
S.L. Balloun
Keyword(s):  
Amino Acids ◽  
Blood Plasma ◽  
Dietary Protein ◽  
Free Amino Acids ◽  
Free Amino

Effects of dietary protein and potassium contents on plasma urea nitrogen and amino acids in relation to performance of swine

1996 ◽  
Vol 76 (3) ◽  
pp. 351-355 ◽  
Author(s):  
Yongjiu Cai ◽  
Richard C. Ewan ◽  
Dean R. Zimmerman
Keyword(s):  
Amino Acids ◽  
Glutamic Acid ◽  
Dietary Protein ◽  
Free Amino Acids ◽  
Free Amino ◽  
Protein Diet ◽  
Urea Nitrogen ◽  
Plasma Urea ◽  
Protein Diets ◽  
Potassium Addition

Ninty-six 51 kg-pigs were used to determine effects of dietary protein and potassium levels on concentrations of plasma urea nitrogen (PUN) and free amino acids. Pigs were fed four diets containing 13 or 15% of protein and 0 or 0.4% of potassium addition. Gilts took more days to reach an average weight of 110 kg with lower PUN and less backfat than barrows (P < 0.05), but sex did not affect concentrations of plasma free amino acids (P > 0.10). The pigs fed 15% protein diets had higher PUN (P < 0.01) and plasma threonine and isoleucine (P < 0.05), but lower (P < 0.05) plasma lysine, glutamic acid and glycine than pigs fed 13% protein diets. The 0.4% potassium addition resulted in a tendency to increase PUN (P = 0.06) and a decrease in concentrations of plasma alanine, glutamic acid and glycine (P < 0.05). There was an interaction between protein and potassium treatments (P < 0.05) in which plasma lysine concentration decreased with potassium addition to the 13% protein diet but increased with potassium addition to the 15% protein diet. The results indicate that lower PUN concentrations in gilts were associated with improved efficiency of deposition of dietary nitrogen, resulting in improved carcass grade compared with barrows receiving the same dietary treatments. Key words: Plasma urea nitrogen, free amino acids, protein, potassium, pigs

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