scholarly journals Effect of Dietary Linoleic Acid on Fatty Acid Composition of Egg Yolk, Liver and Adipose Tissue

1971 ◽  
Vol 50 (3) ◽  
pp. 845-850 ◽  
Author(s):  
W. Guenter ◽  
D.B. Bragg ◽  
P.A. Kondra
Keyword(s):  
Adipose Tissue ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Linoleic Acid ◽  
Acid Composition ◽  
Egg Yolk ◽  
Dietary Linoleic Acid

LIPID CONCENTRATION AND COMPOSITION IN HUMAN FETAL TISSUE DURING DEVELOPMENT

PEDIATRICS ◽  
1971 ◽  
Vol 48 (4) ◽  
pp. 540-546
Author(s):  
Jacques F. Roux ◽  
Y. Takeda ◽  
A. Grigorian
Keyword(s):  
Adipose Tissue ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Linoleic Acid ◽  
Acid Composition ◽  
Cell Structure ◽  
Fetal Tissue ◽  
Lipid Concentration ◽  
Human Fetal Tissues ◽  
Fetal Organs

The concentration and fatty acid composition of lipids from the sixth to thirty-second week of gestation has been measured in human fetal tissues. The data found show that the lipid concentration and fatty acid composition does not vary significantly during these stages of development. However, more palmitic acid and less linoleic acid is detected in fetal adipose tissue than in that of the mother and this relationship does not change in the immediate postpartum period. The results suggest that fetal lipid metabolism is well established early in gestation and that the concentration of lipids increases in proportion to the rate of growth of the fetal organs and cell structure.

scholarly journals Effects of dietary conjugated linoleic acid on fatty acid composition and cholesterol content of hen egg yolks

2003 ◽  
Vol 90 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Beata Szymczyk ◽  
Paweł M. Pisulewski
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Linoleic Acid ◽  
Acid Composition ◽  
Egg Yolk ◽  
Cholesterol Content ◽  
Dietary Conjugated Linoleic Acid ◽  
Egg Yolks ◽  
Cla Isomers

The main objectives of the present study were to determine the effect of dietary conjugated linoleic acid (CLA) isomers on the fatty acid composition and cholesterol content of egg-yolk lipids. Forty-five 25-week-old laying hens were randomly distributed into five groups of nine hens each and maintained in individual laying cages, throughout 12 weeks of the experiment. They were assigned to the five treatments that consisted of commercial layer diets containing 0, 5, 10, 15 or 20g pure CLA/kg. Feed intake of hens varied little and insignificantly. Egg mass was uniformly lower (P<0·05) in the hens fed the CLA-enriched diets. Feed conversion efficiency, when expressed per kg eggs, was impaired (P<0·05), although without obvious relation to the dietary CLA concentration. Feeding the CLA-enriched diets resulted in gradually increasing deposition of CLA isomers (P<0·01) in egg-yolk lipids. Saturated fatty acids were increased (P<0·01) and monounsaturated fatty acids decreased (P<0·01). Polyunsaturated fatty acids (PUFA), when expressed as non-CLA PUFA, were also significantly decreased (P<0·01). The most striking effects (P<0·01) were observed for palmitic (16 : 0) and stearic (18 : 0) acids, which increased from 23·6 to 34% and from 7·8 to 18%, respectively. On the other hand, oleic acid (18 : 1n-9) decreased from 45·8 to 24·3%. Among non-CLA PUFA, linoleic (18 : 2n-6) and α-linolenic (18 : 3n-3) acids were strongly (P<0·01) decreased, from 14·2 to 7·7% and from 1·3 to 0·3%, respectively. The same was true for arachidonic (20:4n-6) and docosahexaenoic (22 : 6n-3) acids. The cholesterol content of egg yolks, when expressed in mg/g yolk, was not affected by the dietary CLA concentrations. In conclusion, unless the adverse effects of CLA feeding to laying hens on the fatty acid profile of egg yolks are eliminated, the CLA-enriched eggs cannot be considered functional food products.

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