dite sans acide érucique produite au Canada à partir de variétés sélectionnées présente, par rapport à l'huile de colza riche en acide érucique, une composition en acides gras profondément modifiée. Les acides érucique (C ' 21) ,) et gadoléique (C 20;¡) sont remplacés par l'acide oléique (6 0 p. 100 des acides gras totaux). Les teneurs en acides gras saturés (6 p. 100 environ) et polymsaturés ne sont p 7L r contre que peu affectées. Cette modification de la composition en acides gras de l'huile entraîne, chez le Rat, une utilisation digestive différente. Le coefficient d'utilisation digestive apparent de l'huile de colza sans acide érucique a été évalué à 95 p. 100 contre 8 1 p. 100 pour l'huile de colza riche en acide érucique. Les acides érucique et ga3oléique sont les éléments responsables de la moins bonne utilisation digestive de l'huile de colza riche en acide érucique, puisqu'ils représentent 8 5 p. 100 des acides gras retrouvés dans les fèces. L'utilisation d'une méthode récente d'extraction des lipides fécaux (TouLLFe et al., 19 68) a permis d'abor3er le problème de la forme sous laquelle sont éliminés les acides gras non absorbés des huiles de colza et en particulier l'acide érucique.

Recent findings on the nutritive value of rapeseed oil (RSO) with high erucic acid content have been compared to those of eanbra oil (CO), an oil extracted from newly bred Canadian rapeseed with no erueie acid. Erucic acid in diets retards animal growth even if food consumption is not altered. Growth performances of CO are as good as olive or peanut oil. The unbalanced ratio of palmitic acid to monoethylenic acids of CO does not affect rat growth rate. Because of its glyeeride structure and high content of erucic acid, RSO has a lower digestibility (81%) than CO (96%) in the rat. Unabsorbed erucic acid is not preferentially excreted as calcium soaps. Interesterification of RSO which converts 31.7% of the erucic chains to the 2 position improves digestibility of erucic acid. 2-Monoerucin is more efficiently absorbed than the free acid. In vivo metabolic conversion of erucic to oleie acid has been proved in the rat. fl-oxidation of injected 14-14C labeled erucic acid proceeded at the same rate as oleic acid but the over-all yield of the reaction was lower. Fatty acid composition of tissues in animals fed RSO or CO is influenced on one hand by erueic and gadoleic (C2o:i) acids of RSO, and on the other hand by the unbalanced ratio of palmitic-monoethylenic acids and the linolenic acid content of both oils. Nonnegligible amounts of erueic acid are deposited in the body fats of rats, chickens, turkeys, lambs and found in the milk of female rats fed RSO. Almost no erueic acid is incorporated in liver and testicles in the rat and it is not recovered in chicken egg yolk. The effect of RSO on rat reproduction has been re-examined. Dietary lipid and vitamin levels are of great importance in the results

No abstract

AN investigation was conducted with 14 samples of flour to determine the composition and baking value of the different sized particles. Almost one-fourth of the flour, all of which was passed through a series of bolting silks number I 5, I 8, 20 and 2 I, * Communicated by the Chief of the Bureau.

with sulphur dioxide and the solution boiled only a few minutes, other conditions being exactly the same as in the preceding series of experiments. Te required. Gram. UNIVERSITY OF WISCONSIN. >f 4DISON, WIS.