Influence du degré d’insaturation des lipides alimentaires sur la croissance et la lipogénèse chez le rat

Abstract

In the growing rats weighing between 70 and 300 g, when 20 % of the total daily energy intake consists either of ‘lard (with 36 % oleic acid) or sunflowerseed oil (with 61 % linoleic acid)’, lipogenesis, proteinogenesis, feed efficiency ratio and body compositions are identical. With the nutritional conditions used during these experiments, the occurrence of a high level of polyunsaturated fatty acids level in the diet cannot be considered as an exogenous factor able to modify the parameters studied.

Relationships between fatty acid composition of body lipids and lipid mobilization in rat. I. A study of carcass lipids

“…Introducing sunflower-seed oil into the diet (Demarne et al, 1975) as 20 p. 100 of the overall energy supply does not quantitatively alter lipogenesis and proteinogenesis in the young growing rat.…”

“…On the other hand, some authors think that linoleic acid, in spite of special physiological properties related to its essential fatty acid characteristics, undergoes the same catabolism as other long-chain fatty acids present in body triglycerides (Hirsch, 1961 ;Longenecker,1939a ;Stein and Stein, 1962 (Demarne et al, 1975). In the carcasses of animals receiving lard (lot L), oleic acid (C,, : ,) is found in higher amounts than other fatty acids, while linoleic acid (C I8:2 ) is present in larger quantities in the carcasses of rat fed the sunflower-seed oil.…”

Relationships between fatty acid composition of body lipids and lipid mobilization in rat. II. A study of liver lipids

“…At the beginning of the period of dietary energy restriction (300 g) total lipid fatty acid composition in the 2 liver types is different, being particularly characterized by higher oleic acid concentration (C Is: 10 )9) in lot L and linoleic acid concentration (C I8: 20 ) (Demarne et al, 1974 ;Flanzy et al, 1970 ;Fran-!ois and Flanzy, 1959). Many studies have shown the relations between oleic (C I8: 10) 9 ) or linoleic (C I8 : 20)6) acid concentrations in dietary lipids and those observed in the adipose tissues of animals ingesting them (Bollinger and Reiser, 1965 ;Demarne et al, 1975).…”

Effets de l'ingestion de tri-dodécanoate de glycérol (Tri C12 : 0) sur la composition en acides gras des lipides de différents dépôts adipeux chez le porc

“…For (Bollinger et Reiser, 1965). A la différence de ce qui est observé avec les acides gras insaturés (Clément et al, 1963 ;Demarne et al, 1975) (Bollinger et Reiser, 1965 ;Kaunitz et Johnson, 1968).…”