Abstract
Two groups, each of six male castrated pigs, ranging in weight from 37 to 56 kg, were used in a nutrient balance experiment designed to study the effect of adding different levels of kelp (Nereocystis luetkeana) meal to a mineral–vitamin fortified diet of barley and soybean meal. The kelp meal showed a negative nitrogen digestibility ranging from 1.9 to 4.7 g fecal nitrogen loss/100 g dry kelp intake. Organic matter digestibility of kelp, calculated by difference, varied from −26.7 to −0.2%. Kelp ash comprised 46.1% of kelp dry matter and had a high digestibility resulting from high levels of chlorine, potassium and sodium (22.2, 11.7 and 9.1 g/100 g dry kelp, respectively). The apparent digestibility of these ions was 101.5, 90.9 and 87.1%, respectively, in the 20% kelp meal diet. Digestibility of iodine for the four diets containing kelp ranged from 74.8 to 80.1%. It was concluded that any value of kelp meal must be other than as a source of macronutrients.
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