The nutrition of the early-weaned calf VII. The relative value of four different fish meal products as the major protein source in the diet

While it is generally agreed that fish meal protein is of high biological value for non-ruminants, variations in quality are known to occur as a result of differences in the nature of the parent material (Duckworth, Woodham and McDonald, 1961) or in the method of processing (Grau et al., 1959; Ousterhout and Snyder, 1961). Duckworth, Woodham and McDonald (1961) have shown that the Gross Protein Value offish meals can range from 92 to 119; within this range white-fish meals had a mean value of 102 while the mean value for herring meals was 113. Differences of a similar order have been reported by other workers (Record and Bethke, 1933; Heiman, Carver and Cook, 1939; Robertson, Carver and Cook, 1940; March, Stupich and Biely, 1949; Carpenter, 1954; Carpenter, Ellinger and Shrimpton, 1954; Duckworth, 1955).