Utilization of Rapeseed Oils of High and Low Erucic Acid Contents

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Abstract
Two experiments with chicks were conducted in which the utilizations of regular rapeseed oil of Canadian type and rapeseed oils prepared from the Oro (Canbra oil) and Span (Span oil) varieties of rapeseed were compared against those of soybean oil and lard. The oils and fat were included at the 5-, 10- and 15-percent levels in starter rations that were calculated to be isocaloric and isonitrogenous. In general, it was found that the digestibilities of total fatty acids in the rations increased with increasing amounts of oil or fat in the rations. At the 5-percent level of inclusion, digestibility was lowest for regular rapeseed oil (85.5%) followed by lard, Canbra oil, Span oil and highest for soybean oil (90.3%). The digestibility of soybean oil was highest at all levels of supplementation and was followed closely by Span oil with about 1% lower digestibility. The digestibilities of regular rapeseed oil and Canbra oil differed by only 0.9% when included in the ration at the 10-percent level and showed similar digestibilities when added to the ration at the 15-percent level. At the 10- and 15-percent levels of feeding both of these oils had lower digestibilities than Span oil. Gadoleic (C20:1) and erucic acids (C22:1) were well digested by the chickens receiving rations containing regular rapeseed oil. The digestibilities of these fatty acids increased with increasing amounts of oil in the rations only in the groups fed the rations supplemented with regular rapeseed oil. On the overall average, the digestibility of gadoleic acid varied between 86.8 (Canbra oil) and 90.0% (regular rapeseed oil) and of erucic acid between 84.4 (Canbra oil) and 89.9% (Span oil). Feeding regular rapeseed oil to chickens led to a decrease in body weight with increasing amounts of oil in the diet, whereas for lard the reverse was true. The decrease in body weight noted in the groups fed rations containing regular rapeseed oil was not associated

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