Rapeseed bread is a by-product of rapeseed oil extraction. Because of the adaptability of rape, high yield, high oil yield, widely planted at home and abroad. At present, most of China's rapeseed cake meal is used directly as fertilizer, used as feed only a small part, which is obviously a great waste. From a nutritional point of view, rapeseed meal is also a high-quality protein feed, crude protein content is generally 28-34%.

In order to improve the effect of use, avoid poisoning, the production of limited feeding methods, dosage control at less than 10%, and with bean cake protein feed. Detoxification should be made when the dosing is large.

The detoxification treatment methods of rapeseed cake are: pit burial method, leaching method, heating treatment method, ammonia-alkali treatment method, organic solvent leaching method, microbial fermentation method, iron sulfate method and so on. However, these methods are strictly controlled raw materials, production process under the specific conditions of the effect, due to cost equipment and many other reasons, the detoxification treatment of rapeseed cake can not be popularized and applied in production practice. The fundamental way to solve the toxicity of rapeseed cakes is to cultivate low-toxic or non-toxic rape varieties, such as canada has developed low-sulfur glucose (content 2.46mg/g) and low mustard acid (0.15%) of the "double Low "variety - "Tower", in recent years has become a Candle variety, the variety in addition to the "double low" characteristics, crude fiber content is also low, which fundamentally get rid of the rapeseed cake with low effective energy value, toxic ingredients are difficult to solve the problem.

National standards for rapeseed cakes for feed stipulate that: the sensory characteristics are brown, small tile, flaky or pie-like, with the aroma of rapeseed oil, no fermentation, mold and odor;