Fish meal nutritive value

Numerous other recent anlyses of various kinds of fish meals indicate the rich protein content of these products (Moen, 1951 Helmel, 1951 Balken, 1952 Buffa, 1952). Values up to 60% of nutritionally high-grade protein are reported. 

Blood meal is a chocolate-coloured powder with a characteristic smell. It contains about 800 g/kg of protein, small amounts of ash and oil, and about 100 g/kg of water. It is important nutritionally only as a source of protein. Blood meal is one of the richest sources of lysine and a rich source of arginine, methionine, cystine and leucine, but it is deficient in isoleucine and contains less glycine than fish, meat, or meat and bone meals. Owing to the poor balance of amino acids, its biological value is low in addition, it has a low digestibility. It has the advantage, in certain situations, that its protein has a very low rumen degradability (about 0.20). 

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