It has been recognized that gossypol has a limiting effect on the usage of cottonseed meal in nonruminant rations. Extensive research supported by practical experience has shown that cottonseed meal may be a major oilseed supplemental protein source in nonruminant rations when care is taken to accept and adjust for gossypol limitations. Scientifically derived gossypol limitations will not significantly restrict cottonseed meal usage in practical nonruminant rations.

Crude soybean and cottonseed oil were processed using simulated commercial processing procedures to determine if oil processing would remove chlorinated pesticide contaminants of either natural or spiked origin. Two crude oil lots were spiked with endrin, DDT, DDE, aldrin, dieldrin, heptaehlor and heptaehlor epoxide before processing. Representative samples of crude oil and products following each processing step were analyzed for pesticide contamination. Results indicated that alkali-refining or subsequent bleaching did not reduce chlorinated pesticide contamination. Hydrogenation prior to deodorization reduced endrin contamination. Deodorization, with or without hydrogenation, eliminated chlorinated pesticides. The results of this study indicate that normal commercial processing of crude vegetable oils for human consumption effectively removes any chlorinated pesticides which may be present in crude oils. It is hypothesized that chlorinated pesticide removal is achieved by volatilization during deodorization, which is supported by known volatilization characteristics, similarity of behavior in pesticides studied, and absence of the pesticide or its conversion products in the finished oils, or both.

The nutrient composition of oilseeds is a variable property. The oilseed's genetics, growing environment, handling, storage and processing all present variables which may affect the nutrient composition and resultant nutritional value. How well an oilseed protein product achieves the desired use effect will depend on its inherent composition.

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