THE EFFECTS OF DIFFERENT VARIETIES OF RAPESEED OIL ON WEIGHT GAIN, AND OF GOLDEN RAPESEED OIL ON REPRODUCTION, OF THE RAT

1959 ◽  
Vol 37 (1) ◽  
pp. 1191-1195 ◽  
Author(s):  
Joyce L. Beare ◽  
E. R. W. Gregory ◽  
J. A. Campbell
Keyword(s):  
Weight Gain ◽  
Erucic Acid ◽  
Rapeseed Oil ◽  
Corn Oil ◽  
Retarding Effect ◽  
Wistar Strain ◽  
Weanling Rats ◽  
Weight Gains ◽  
Reproduction Study

Rapeseed oil of the Polish, Golden, or Swedish varieties, corn oil, or mixtures of corn oil and ethyl erucate were fed to weanling rats of the Wistar strain for 9 weeks. Weight gains were inversely related to the content of erucic acid in the diet, confirming previous indications that the growth retarding effect of rapeseed oil is due to its erucic acid. In general, the differences in weight gains could be explained by the effect of rapeseed oil on food consumption.Golden rapeseed oil and corn oil were compared in a reproduction study involving three litters of one generation. Although the young of rats fed rapeseed oil were of lesser weanling weight, there was no difference in the number of animals successfully weaned.

THE EFFECTS OF DIFFERENT VARIETIES OF RAPESEED OIL ON WEIGHT GAIN, AND OF GOLDEN RAPESEED OIL ON REPRODUCTION, OF THE RAT

1959 ◽  
Vol 37 (10) ◽  
pp. 1191-1195 ◽  
Author(s):  
Joyce L. Beare ◽  
E. R. W. Gregory ◽  
J. A. Campbell
Keyword(s):  
Weight Gain ◽  
Erucic Acid ◽  
Rapeseed Oil ◽  
Corn Oil ◽  
Retarding Effect ◽  
Wistar Strain ◽  
Weanling Rats ◽  
Weight Gains ◽  
Reproduction Study

Rapeseed oil of the Polish, Golden, or Swedish varieties, corn oil, or mixtures of corn oil and ethyl erucate were fed to weanling rats of the Wistar strain for 9 weeks. Weight gains were inversely related to the content of erucic acid in the diet, confirming previous indications that the growth retarding effect of rapeseed oil is due to its erucic acid. In general, the differences in weight gains could be explained by the effect of rapeseed oil on food consumption.Golden rapeseed oil and corn oil were compared in a reproduction study involving three litters of one generation. Although the young of rats fed rapeseed oil were of lesser weanling weight, there was no difference in the number of animals successfully weaned.

EFFECTS OF SATURATED FAT IN RATS FED RAPESEED OIL

1963 ◽  
Vol 41 (1) ◽  
pp. 605-612 ◽  
Author(s):  
Joyce L. Beare ◽  
J. A. Campbell ◽  
C. G. Youngs ◽  
B. M. Craig
Keyword(s):  
Fatty Acids ◽  
Erucic Acid ◽  
Palmitic Acid ◽  
Rapeseed Oil ◽  
Unsaturated Fatty Acids ◽  
Corn Oil ◽  
Methyl Esters ◽  
Saturated Fatty Acids ◽  
Weight Gains ◽  
Similar Content

The effects of increasing the saturated fatty acids in a dietary vegetable oil composed mostly of unsaturated fatty acids were studied in rats. A mixture of palm oil and Swedish rapeseed oil fed for 4 weeks as 20% of a purified diet promoted weight gains which exceeded those obtained with Polish rapeseed oil of a similar content of erucic acid, and altered the proportion of saturated fatty acids in the tissues to reflect that of the diet. When methyl esters of saturated fatty acids were added to Swedish rapeseed oil, similar effects on weight gain were not observed, but methyl esters of fatty acids from corn oil and rapeseed oil were shown to be of less nutritional value than the original glycerides. From fatty acids of olive oil, glycerides containing 3% palmitic acid were prepared, and produced weight gains which did not differ significantly from those of rats fed Polish rapeseed oil with a similar content of palmitic acid and 20% erucic acid. The characteristic effects of rapeseed oil are, therefore, attributed to its low content of saturated fatty acids as well as its high content of erucic acid.

EFFECTS OF SATURATED FAT IN RATS FED RAPESEED OIL

1963 ◽  
Vol 41 (3) ◽  
pp. 605-612 ◽  
Author(s):  
Joyce L. Beare ◽  
J. A. Campbell ◽  
C. G. Youngs ◽  
B. M. Craig
Keyword(s):  
Fatty Acids ◽  
Erucic Acid ◽  
Palmitic Acid ◽  
Rapeseed Oil ◽  
Unsaturated Fatty Acids ◽  
Corn Oil ◽  
Methyl Esters ◽  
Saturated Fatty Acids ◽  
Weight Gains ◽  
Similar Content

The effects of increasing the saturated fatty acids in a dietary vegetable oil composed mostly of unsaturated fatty acids were studied in rats. A mixture of palm oil and Swedish rapeseed oil fed for 4 weeks as 20% of a purified diet promoted weight gains which exceeded those obtained with Polish rapeseed oil of a similar content of erucic acid, and altered the proportion of saturated fatty acids in the tissues to reflect that of the diet. When methyl esters of saturated fatty acids were added to Swedish rapeseed oil, similar effects on weight gain were not observed, but methyl esters of fatty acids from corn oil and rapeseed oil were shown to be of less nutritional value than the original glycerides. From fatty acids of olive oil, glycerides containing 3% palmitic acid were prepared, and produced weight gains which did not differ significantly from those of rats fed Polish rapeseed oil with a similar content of palmitic acid and 20% erucic acid. The characteristic effects of rapeseed oil are, therefore, attributed to its low content of saturated fatty acids as well as its high content of erucic acid.

EFFECTS OF VARYING PROPORTIONS OF DIETARY RAPESEED OIL ON THE RAT

1957 ◽  
Vol 35 (12) ◽  
pp. 1225-1231 ◽  
Author(s):  
Joyce L. Beare ◽  
T. K. Murray ◽  
J. A. Campbell
Keyword(s):  
Body Weight ◽  
Rapeseed Oil ◽  
Corn Oil ◽  
Liver Weight ◽  
Male Rats ◽  
Weanling Rats ◽  
Total Diet ◽  
Weight Gains ◽  
Lipid Excretion

Rapeseed oil, corn oil, and mixtures of the two oils containing 5, 10, 20, 40, and 80% rapeseed oil were fed to weanling rats at levels of 10 and 20% by weight of the purified diet. A significant decrease in body weight gains and in food consumptions occurred with the two highest levels of rapeseed oil, that is, 16 and 20% by weight of the total diet. At the same levels there was an increased lipid excretion. Corn oil and rapeseed oil which had been heated to 200 °C. for 120 hours produced no changes in weight gains when fed at the 10% level, but exhibited some growth-retarding effects at the 20% level. At both levels heated corn oil and rapeseed oil increased the liver weight of male rats.

EFFECTS OF VARYING PROPORTIONS OF DIETARY RAPESEED OIL ON THE RAT

1957 ◽  
Vol 35 (1) ◽  
pp. 1225-1231 ◽  
Author(s):  
Joyce L. Beare ◽  
T. K. Murray ◽  
J. A. Campbell
Keyword(s):  
Body Weight ◽  
Rapeseed Oil ◽  
Corn Oil ◽  
Liver Weight ◽  
Male Rats ◽  
Weanling Rats ◽  
Total Diet ◽  
Weight Gains ◽  
Lipid Excretion

Rapeseed oil, corn oil, and mixtures of the two oils containing 5, 10, 20, 40, and 80% rapeseed oil were fed to weanling rats at levels of 10 and 20% by weight of the purified diet. A significant decrease in body weight gains and in food consumptions occurred with the two highest levels of rapeseed oil, that is, 16 and 20% by weight of the total diet. At the same levels there was an increased lipid excretion. Corn oil and rapeseed oil which had been heated to 200 °C. for 120 hours produced no changes in weight gains when fed at the 10% level, but exhibited some growth-retarding effects at the 20% level. At both levels heated corn oil and rapeseed oil increased the liver weight of male rats.

A COMPARISON OF THE UTILIZATION OF RAPESEED OIL AND CORN OIL BY THE RAT

1959 ◽  
Vol 37 (5) ◽  
pp. 613-621 ◽  
Author(s):  
Joyce L. Beare ◽  
T. K. Murray ◽  
H. C. Grice ◽  
J. A. Campbell
Keyword(s):  
Body Weight ◽  
Vitamin A ◽  
Rapeseed Oil ◽  
Wistar Rats ◽  
Corn Oil ◽  
Weekly Interval ◽  
Organ Weights ◽  
Weight Gains ◽  
Ad Libitum ◽  
Liver Storage

The effects of Golden rapeseed oil and corn oil on weekly weight gains, food consumptions, liver storage of vitamin A, plasma and adrenal cholesterol concentrations, organ weights, and testes histology were determined in Wistar rats for 5 weeks after weaning. At each weekly interval, animals fed rapeseed oil showed lesser weight gains and food consumptions, but, when body weight gains were adjusted for food consumptions by covariance analyses, differences largely disappeared. Liver storage of vitamin A was similar with both oils. Testes of animals fed rapeseed oil exhibited no alteration in cellular characteristics, but a reduction in tubular size. When fed to older rats, rapeseed oil again produced smaller weight gains which were accounted for at 4 weeks' time by a depressed appetite.Similar weight gains were obtained with corn oil and rapeseed oil when the oils were paired fed and when adjustments for food consumption were made by covariance analyses of weight gains of animals receiving the oils ad libitum. With corn oil supplied on a restricted basis the testicular tubules were smaller than those obtained with unrestricted feeding of corn oil. The absorption of corn oil and rapeseed oil fed ad libitum was 95 and 92% respectively. It was concluded that the two oils were not very differently utilized.

THE DETERMINATION OF THE AVAILABLE CALORIC CONTENT OF RAPESEED OIL BY RAT GROWTH

1958 ◽  
Vol 36 (1) ◽  
pp. 203-208 ◽  
Author(s):  
E. J. Middleton ◽  
J. A. Campbell
Keyword(s):  
Rapeseed Oil ◽  
Corn Oil ◽  
Metabolic Energy ◽  
Caloric Content ◽  
Growth Responses ◽  
Weight Growth ◽  
Weanling Rats ◽  
Significant Difference ◽  
Rat Growth

The available metabolic energy of rapeseed oil, semihydrogenated rapeseed oil, and corn oil was measured in terms of 7-day body-weight gains of weanling rats fed a calorically restricted diet. Standard bio-assay procedures were used with lard as a reference standard. The oils were fed at three levels equivalent to 5, 9, and 17% of the diet by weight. Growth responses to the three oils and to lard were similar and the calculated caloric content of the oils showed no significant difference from that of lard. A 1 week assay was as precise as a 5 week assay.

INFLUENCE OF SELECTIVE AND NON-SELECTIVE HYDROGENATION OF RAPESEED OIL ON CARCASS FAT OF RATS

1963 ◽  
Vol 41 (1) ◽  
pp. 51-56 ◽  
Author(s):  
B. M. Craig ◽  
C. G. Youngs ◽  
Joyce L. Beare ◽  
J. A. Campbell
Keyword(s):  
Erucic Acid ◽  
Olive Oil ◽  
Corn Oil ◽  
Dietary Fatty Acids ◽  
The Body ◽  
Lower Body ◽  
Dietary Oils ◽  
Lower Weight ◽  
Lower Body Weight ◽  
Weight Gains

Two rapeseed oils with erucic acid contents of 23 and 42%, their hydrogenated products produced under selective and non-selective conditions, corn oil, and a lard – olive oil mixture were fed to separate groups of rats for 4 weeks. Fatty acid composition of dietary oils and carcass fats was determined. The rapeseed oils and their hydrogenated products were associated with lower food intakes and lower body weight gains than were corn oil and the lard – olive oil mixture. Small amounts of erucic acid were incorporated into the body fats. It is possible that the amount of palmitic acid in the rapeseed oils and their products is too small for a good balance of dietary fatty acids, and is partially responsible for the lower weight gains.

Effects of Adaptive and Nonadaptive Feeding of Hydrogenated and Raw Herring Oil on Hearts and Livers of Weanling Rats

1971 ◽  
Vol 28 (11) ◽  
pp. 1793-1795 ◽  
Author(s):  
P. H. Odense ◽  
H. Brockerhoff
Keyword(s):  
Rapeseed Oil ◽  
Corn Oil ◽  
Initial Period ◽  
The Body ◽  
Control Groups ◽  
Cardiac Damage ◽  
Histological Changes ◽  
Weanling Rats ◽  
Body Weights ◽  
Cardiac Lesions

It has been reported that the feeding of high levels of rapeseed oil to weanling rats leads to the eventual appearance of cardiac lesions. Marine oils have come under suspicion since most of them contain lesser amounts of the long-chain (C20 and C22) monounsaturated acids found in rapeseed oil. Weanling rats, male and female, were given diets containing 18% hydrogenated or raw herring oil for 24 days. Two other groups were adapted gradually to these diets during an initial period of 12 days. Control groups were kept on diets containing corn oil and lard. Histological investigations of the hearts failed to produce any evidence of unusual fat deposition or cardiac damage in any of the rats, either control or experimental. The possibility that a more prolonged feeding of the oil could lead to lesions cannot be excluded. Liver weights, when expressed as fractions of the body weights, were slightly, though significantly, higher (13–27%) in all groups fed with raw or hydrogenated herring oil, but histological examination failed to disclose any difference between these livers and those of the control groups. The experiments indicate that herring oil, raw or hydrogenated, when fed to weanling rats for 24 days, produced no untoward histological changes in the heart or liver tissues.

DEPOSITION OF ERUCIC ACID IN SWINE TISSUE LIPIDS

1972 ◽  
Vol 52 (4) ◽  
pp. 713-719 ◽  
Author(s):  
B. L. WALKER
Keyword(s):  
Erucic Acid ◽  
Dietary Fat ◽  
Rapeseed Oil ◽  
Palmitoleic Acid ◽  
Corn Oil ◽  
Eicosenoic Acid ◽  
Fatty Acid Analysis ◽  
Total Fatty Acids ◽  
Tissue Lipids ◽  
Swine Tissue

Swine were maintained for 6 weeks on practical corn–soy diets containing 10% corn oil (Zea mays) or 10% rapeseed oil (Brassica napus). Tissue lipids were extracted and subjected to fatty acid analysis. Erucic acid deposition was greatest in plasma and adipose tissue lipids, accounting for more than 7% of the total fatty acids. In the spleen, adrenal, erythrocyte, and heart, 22:1 comprised 3–5% of the total acids, whereas in the ovary, liver, kidney, and testis, only 1–3% was found. Eicosenoic acid was present in approximately the same concentration as erucic acid in most tissues. Generally, more oleic and palmitoleic acid and less linoleic acid occurred in the tissues from pigs receiving rapeseed oil. There was no marked influence of dietary fat on tissue polyunsaturated acids.

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