Cutting off beak and rationally matching diet to prevent chicken pecking

The first effective way to prevent chicken pecking is to cut off the beak of the chicks. Second, with a reasonable diet, the ratio of amino acids to vitamins in the diet is as follows: methionine more than 0.7%, tryptophan more than 0.2%, lysine more than 1%, leucine more than 1.4%, cystine more than 0.35%, vitamin B2, 2.6 mg per kilogram of feed, vitamin B6, 2.6 mg, vitamin A1200 international units, vitamin D3110 international units, etc.