A critical study was made of a number of lipid extraction methods on stabilised brown fish meals and on white fish meal. By analysing the lipids it was shown that in all procedures proteinaceous material was extracted and an attempt was made to correct for this non-lipid material. On the basis of the results obtained it seemed that the Bligh and Dyer method gave the highest yield of lipid. In addition it was found that the EEC procedure needed the application of a correction factor to account for the losses sustained in the hydrolysis step.
The suitability for fish silage-making of eight different Lactobacillus cultures was investigated. The industrial by-products whey powder and molasses, as well as refined sugar, were tested as fermentation substrates. Using the information obtained two batches of fish silage were made at local white fish processing plants on a semi-commercial basis and subsequently successfully used on local cattle and pig farms.
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