Protein is one of the animal's most important essential nutrients. Lack of protein will seriously affect the growth and reproduction of animals and even threaten the lives of animals. In order to obtain the desired production effect, it is necessary to provide enough and reasonable protein feeds. How to provide protein feed is considered reasonable? To understand this problem, you need to know the composition of the protein units - amino acids, essential amino acids and non-essential amino acids, as well as limiting amino acids.
In animal nutrition, the composition and ratio of the amino acids of the protein are identical to the composition and ratio of the amino acids of the protein required by the animal, including the essential amino acids and the composition and ratio between essential amino acids and non-essential amino acids. The utilization of this protein should be 100%. Such a protein is called an ideal protein. The amino acid composition of this ideal protein is called the ideal amino acid pattern.
The ideal amino acid patterns of different animals are different, and the ideal amino acid patterns of the same animal in different economic directions and physiological stages are also quite different. Therefore, when designing feed formulas for rabbits, it is necessary not only to pay attention to the content of protein in feeds, but also to the quality of amino acids, that is, the content and ratio of essential amino acids, with particular attention to the content and ratio of limiting amino acids.
According to my many years of research, lysine is the first limiting amino acid for growing or fattening rabbits, and methionine is called the second limiting amino acid. In feed, they should pay attention to their content and ratio. In general, in the fastest growing stage, the lysine content should be 0.85%-1% (depending on the species, modern meat rabbits should be higher), while the sulfur-containing amino acids (methionine and cysteine) The sum of the amino acids should be above 0.55%; for hairy rabbits and commercial hairy rabbits, methionine is the first limiting amino acid and lysine is the second limiting amino acid. The content of sulfur-containing amino acids should be above 0.65%, while lysine can be between 0.8% and 0.85%. By the same token, because of the higher content of methionine in milk, the first limiting amino acid of lactating female rabbits is also methionine and lysine is the second limiting amino acid.
In production, in order to improve the production performance of rabbits, attention must be paid to feed quality, especially the content of essential amino acids. Generally, suitable feed ingredients are selected. For example, sesame seed meal contains the highest methionine in the pancake meal and can be added in an appropriate amount. Hydrolyzed feather meal contains more cystine (a kind of sulfur amino acid that can replace part of methionine). The overall quality of animal protein feeds is higher than that of vegetal feeds and can be supplemented appropriately. In addition, according to our research group, rapeseed meal has higher sulphur-containing amino acids (1.74%) than other pancakes, and the protein content of walnut bran is higher than that of soybean meal (the former is more than 48%, the latter is generally 43%).
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