A comparison of Alaskan fish meals to soybean meals as protein supplements for weanling rats
Newman, C.W. | Roth, N.J. | Husby, F.M. | Harrold, R.L. | Calvert, C.C.
Alaskan fish meals prepared from halibut and salmon processing waste and whole carcasses of herring less the roe that were either frozen or packed in salt when captured, were compared to soybean meal as protein supplements in corn-based diets. Weanling male rats were fed isonitrogenous, isocaloric diets prepared from these feedstuffs in growth and nitrogen balance trials. The sodium content of the fish meals ranged from 1.55% in the halibut meal to 5.83% in the fish meal prepared from the salt-packed herring. The salmon and herring meals contained the greatest amount of protein while the halibut contained the most fat. The salt-packed herring meal contained the greatest percentage of lysine on a dry basis (6.02%) and as a percentage of the protein (8.67%) as well as the greatest total percentage of essential amino acids. Performance as judged by total gain, feed/gain ratio, protein efficiency ratio, biological value (BV), net protein utilization (NPU) and dry fat-free body mass was superior, (P less than .02) on the salt packed herring meal. Rats fed the other fish meals and soybean meal in comparable diets were not different in these measurements. It was concluded that the higher lysine in the protein of the salt-packed herring meal resulted in the superior performance of the rats fed the diets prepared with this fish meal. The high level of sodium in the fish meals and a high-salt soybean meal diet did not adversely affect the growth performance of rats or BV and NPU of the proteins.
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