Is it necessary to measure protein as a finished product produced by a feed factory?

Is it necessary to measure protein as a finished product produced by a feed factory? -- Why not test it?-- how did you take the sample? Should be to take a few packets, for example, you do not add soybean meal in a batch of materials, you go out of the sample is certainly not qualified, but as long as the products you do later are qualified, then you can test the protein unqualified? We can see that there is only one possibility, that is, there is something wrong with the operation process of your factory, and all the materials produced are unqualified, otherwise it is difficult to detect it! This is just my personal opinion. What do you think of it? Hehe, where are there so many possibilities? Where are there so many difficulties? If you find a batch of problems, you have to re-examine all the products. I once asked our company to rework all 90 tons of granular materials. Little farmer teacher, I admire you very much! -- Oh, you can't call a teacher. I'm really young! There are a lot of disadvantages in what I do! -- the testing of finished protein should be a routine testing item, which can prevent substandard finished products from entering the market to a certain extent.-- so do we. One day, more than 50 tons of protein produced were not up to standard and all were returned to the machine for treatment. Later, it was found out that the corn entered the soybean meal warehouse-- there is a continuing question, how do you rework these large numbers of nonconforming products?-- testing is necessary. But the test can't find all the problems. How to test and how to control quality is a difficult subject to explain, and it is also difficult to reach an agreement. Of course, it is necessary to test. Otherwise, how do you know if this batch of materials can meet the design requirements?