Soybean meal is widely used in aquaculture, and various amino acids contained in soybean meal can completely meet the special needs of fish for amino acids. In addition, soybean meal can also be used to make cakes and cosmetics; Rapeseed meal is mainly used as an additive for livestock feed. Mainly used as feed for beef cattle, cows, pigs, chickens and fish.
2. In terms of consumption.
Soybean meal has the largest output and consumption, and the price is relatively cheap. In recent years, the annual output has reached more than 38 million tons and the consumption has reached about 35 million tons. The annual output of rapeseed meal is nearly100000 tons, and the consumption is more than 8.3 million tons.
Therefore, in these two aspects, the two cannot replace each other.
Extended data:
The crude protein content of rapeseed meal is about 36%, the amino acid composition is balanced, the sulfur-containing amino acid content is high, the methionine and lysine content are also high, but it is lower than that of soybean meal and the arginine content is low.
Carbohydrates in rapeseed meal are mostly indigestible pentoses, containing 8% pentosans and crude fiber content of 10- 12%, so the available energy level is low, lower than soybean meal and peanut meal, but higher than cotton meal.
The content of nicotinic acid and choline in rapeseed meal is high, but the content of carotene and vitamin D is low. The contents of calcium, phosphorus, selenium and manganese in minerals are high, but 60-70% of phosphorus content belongs to phytic phosphorus, so the utilization rate is low.
Anti-nutritional factor
Rapeseed meal contains many toxic and harmful substances, which greatly limits its application in animal diet. Such as isothiocyanate, thiocyanate, oxazolidinethione, nitrile, sinapine, tannin, phytic acid, etc. It not only affects the palatability of diet and the utilization of other nutrients, but also causes goiter and inhibits the growth of animals.
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