Can cottonseed protein be used instead of soybean meal in pig concentration?

Now the price of soybean meal is rising too fast, can you use cottonseed protein instead of soybean meal, how much can it replace? Why don't you try it? -- A small amount should be okay, right?-- I don't know. -it seems that Dr. Wang doesn't approve of substitution. Cottonseed protein is hard to say!-what is the basic principle of substitution? First do a comparison of total amino acids before coming to a conclusion! Why replace it? What's the reason? Cottonseed protein is a high-quality source of protein for pigs, it can be replaced by less than 20%, and replacing 20% requires proper replenishment of crystal lysine and methionine! -- definitely replace part of it! Believe it or not, no one does that! The crude fiber content of cottonseed meal mainly depends on the degree of shelling of cottonseed meal. Because the crude fiber content of cottonseed meal itself is higher than that of soybean meal, the effective energy lipid of this kind of feed is usually lower than that of soybean meal. In addition, cottonseed meal is characterized by a relatively high content of crude fat, which can reach about 6.1%. However, we need to pay attention to that too high fat content is not conducive to the storage of cottonseed meal and is easy to cause feed oxidation and rancidity. In cottonseed meal, the mineral content is also characterized by less calcium and more phosphorus, and most of them are reproductive acid phosphorus, and the content of trace element iron is relatively high, but the content of trace element selenium is relatively low. Similarly, cottonseed meal also contains a variety of anti-nutritional factors, and among these anti-nutritional factors, it should be said that the greatest impact is free gossypol, which can cause poisoning and even death in animals. In order to make better use of cottonseed meal as a feed source, we must solve the problem of toxicity of cottonseed meal. It should be said that the most fundamental way to solve the problem is to promote non-toxic or low-toxic cotton varieties. At the same time, there are several problems that should be paid attention to. Ferrous sulfate can also be used for detoxification. This is a method. Another way is that when matching the diet, we can pay attention to balancing the amino acids in the diet, especially by adding synthetic lysine, tryptophan and tryptophan, or by increasing the crude protein level of the diet. to reduce the toxicity of gossypol and improve the feeding effect of cottonseed meal, which can improve the production performance of animals. -- 2. Nutritional characteristics of dephenolized cottonseed protein 2.1 nutritional summary of dephenolized cottonseed protein as a high-quality protein feed, crude protein content ≥ 50%, crude fiber ≤ 8%, moisture ≤ 6%, in which the main component of crude protein is globulin, about 90%, followed by glutenin. Three kinds of globulins, 2S, 7s and 12s, were obtained by ultracentrifugation, of which 2S existed outside the protein body, accounting for about 30% (Li Yanling, 2001). 2.2 the nutritional advantage of cottonseed protein 2.2.1 due to its unique processing technology (liquid-liquid-solid extraction), its dry matter content is 93.6% in air-dried state, 89.6% in soybean meal and 82.9% in common cottonseed meal, which is 4 and 10.7 percentage points higher than soybean meal and common cottonseed meal respectively. 2.2.2 the feed with higher protein content than or equal to soybean meal and higher than cottonseed meal and other plant protein sources increased crude protein (CP) content and milk net energy (NEL) by 31.95% and 19% respectively compared with common cottonseed meal (Table 1). The crude protein contents of soybean meal (cake), cotton meal (cake), sunflower meal, rapeseed meal and flax meal are 40-45%, 36-45%, 30-33%, 33-37% and 31-33%, respectively. 2.2.3 the balance of amino acids and the content of essential amino acids are high, especially the content of methionine + cystine is higher than that of other plant protein materials, which can make up for and balance the deficiency of sulfur amino acids in plant protein feed. the composition proportion of lysine and methionine is similar to the ideal protein model (Table 2), the structure is balanced, the total amount of amino acids is 49.26%. It is 8.32 and 16.06 percentage points higher than soybean meal and cottonseed meal respectively. The proportion of amino acid to total protein is 95.6%, which is 4 and 14.7 percentage points higher than that of soybean meal and cottonseed meal, respectively. The content of methionine + cystine is 1.49%, 34.3% higher than soybean meal and 22% higher than common cottonseed meal. The content of sulfur amino acid and lysine is also higher, the content of lysine is slightly lower than soybean meal but higher than general cottonseed meal, and the composition ratio of lysine and methionine is similar to the ideal protein model. Arginine is 5.87%, 10.8% higher than soybean meal and 21.8% higher than ordinary cottonseed meal; isoleucine + leucine is 4.66%, which is higher than ordinary cottonseed meal (3.7%) and equivalent to soybean meal (5.01%); the EAA:NEAA of common cottonseed meal is 1.0Ru 1.35, while the dephenolized cottonseed protein is 1RU 1.09, which is very close to the ideal protein model. 2.2.4 the rumen passing rate is higher than that of ordinary cottonseed meal and soybean meal. It is an ideal rumen protein feed for plant protein feed. The rumen protein raw material has good rumen performance, which can avoid the waste caused by the massive degradation of high quality protein in the rumen. The small intestinal digestibility of protein is increased, that is, the effective protein content is increased (Table 3 and Table 4). The 48-hour rumen penetration rate of 45% cottonseed protein is 55.8%. 54.39 and 16.3 percentage points higher than soybean meal and cottonseed meal respectively. The 48-hour rumen passing rate of 50% cottonseed protein was 51%, which was 49.59 and 11.5 percentage points higher than soybean meal and common cottonseed meal, respectively. Cottonseed protein crude protein 50%, the price is much cheaper than soybean meal, but I don't know what the effect is and how palatable it is.