How to ensure that pigs like to eat feed from one factory and it is not easy to replace it with feed from other factories?

Recently, several users responded: pigs of about 70 jin originally ate our feed well, and their feed intake was also normal. They temporarily used feed from other manufacturers because of feed supply problems, with a maximum of 5 days and a little about 1 day. Later, if we replace it with our feed, the feed intake will not go up, although there will be a feed transition period of about 7 days, and it is normal to eat the food from other manufacturers. Please give some advice on prawns: is it because of food attractants? Which manufacturers' products can achieve this effect? Please everyone, I am very helpless about this problem-this is often encountered by the so-called farmers' product complaints, and such as using your material to diarrhea, for others not to pull, and so on, to make a good product believe in the product. Just like people eat with monosodium glutamate, if you don't put monosodium glutamate or chicken essence in the dish one day, you will find the dish very untasty. The situation that the landlord said should be this phenomenon, hey hey-I have also met, it may be mainly due to food attractants. -just take care of the individual boss and the technology of the pig farm.-is it the price, service, promotion, etc. -there may be other reasons-the digestibility is not good.-We have a similar problem? How do you explain it? -mainly the digestibility of feed.-learn ~-if pigs don't like it, farmers don't like it, especially in winter. It should have nothing to do with the large raw materials of feed, because as long as the growth of food intake is OK, it should have a lot to do with food attractants.