1. Balanced diet: increase the ratio between the restricted amino acids and the required restricted amino acids in the diet, so that the ratio between them is as consistent as possible.

2. Complementarity: By using two or more raw materials together, we can learn from each other's strong points to make up for the shortcomings of individual raw materials' restrictive amino acids, thus improving the balance of restrictive amino acids in the diet.

3. Adding essential amino acids: adding essential amino acids to the feed to increase the content of restrictive amino acids in the feed.

These are some measures to improve the nutritional value of restricted amino acids, which should be adjusted and matched according to different types of restricted amino acids and animal species.