נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Amino acid absorption and endogenous amino acids in the lower ileum and excreta of chicks
Year:
1987
Source of publication :
Journal of Nutrition
Authors :
בילורי, רחל
;
.
יוסיף, ברנרד
;
.
Volume :
117
Co-Authors:
Bielorai, R., Department of Animal Nutrition, Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Iosif, B., Department of Animal Nutrition, Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
1459
To page:
1462
(
Total pages:
4
)
Abstract:
Five diets containing protein levels supplying 5-35 g N/kg, and an N-free diet, were fed ad libitum to six groups of 15 chicks each, from 10 to 16 d of age. Zoybean meal was the only source of protein. Diets contained magnesium ferrite as marker. Individual amino acid absorption was determined by analysis in the lower ileum or excreta as apparent absorption; true absorption was calculated from the slope of the regression curves, obtained by plotting dietary amino acid levels versus amino acids in the lower ileum or excreta. In the excreta, the true values were higher than the apparent ones determined with the three levels of dietary protein (diets 1-3, respectively, were 34.8, 25.7 and 18.1 g N/kg). This difference is the result of elimination of the endogenous fraction as represented by the intercept of the regression line obtained by the calculation method. In the lower ileum both absorption values, the apparent (diets 1-3) and the true (calculated), are almost similar to the true (calculated) ones in the excreta. The method based on regression analysis allows calculation of true absorption from excreta data, without the need to kill the chicks. This has been validated with soybeen meal as the source of protein. The determined endogenous amino acids levels in chicks fed an N-free diet were higher than those calculated from the intercept (the endogenous amino acids related to the feed protein tested), both in the excreta and in the lower ileum. In the lower ileum even the pattern of calculated endogenous amino acids seems to be different from the one determined with the N-free diet. These results support the assumption that the so-called true absorption values calculated by subtracting endogenous amino acids determined with chicks fed an N-free diet are too high. Moreover, values determined in the lower ileum might even be misleading for some amino acids.
Note:
Related Files :
amino acid
animal experiment
chicken
diet
excretion
ileum
nonhuman
Small intestine
soybean protein
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
Language:
אנגלית
Editors' remarks:
ID:
25860
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:18
You may also be interested in
Scientific Publication
Amino acid absorption and endogenous amino acids in the lower ileum and excreta of chicks
117
Bielorai, R., Department of Animal Nutrition, Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Iosif, B., Department of Animal Nutrition, Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Amino acid absorption and endogenous amino acids in the lower ileum and excreta of chicks
Five diets containing protein levels supplying 5-35 g N/kg, and an N-free diet, were fed ad libitum to six groups of 15 chicks each, from 10 to 16 d of age. Zoybean meal was the only source of protein. Diets contained magnesium ferrite as marker. Individual amino acid absorption was determined by analysis in the lower ileum or excreta as apparent absorption; true absorption was calculated from the slope of the regression curves, obtained by plotting dietary amino acid levels versus amino acids in the lower ileum or excreta. In the excreta, the true values were higher than the apparent ones determined with the three levels of dietary protein (diets 1-3, respectively, were 34.8, 25.7 and 18.1 g N/kg). This difference is the result of elimination of the endogenous fraction as represented by the intercept of the regression line obtained by the calculation method. In the lower ileum both absorption values, the apparent (diets 1-3) and the true (calculated), are almost similar to the true (calculated) ones in the excreta. The method based on regression analysis allows calculation of true absorption from excreta data, without the need to kill the chicks. This has been validated with soybeen meal as the source of protein. The determined endogenous amino acids levels in chicks fed an N-free diet were higher than those calculated from the intercept (the endogenous amino acids related to the feed protein tested), both in the excreta and in the lower ileum. In the lower ileum even the pattern of calculated endogenous amino acids seems to be different from the one determined with the N-free diet. These results support the assumption that the so-called true absorption values calculated by subtracting endogenous amino acids determined with chicks fed an N-free diet are too high. Moreover, values determined in the lower ileum might even be misleading for some amino acids.
Scientific Publication
You may also be interested in