Effect Of Replacing Fish Meal With Blood Meal On Chemical Composition Of Supplement For Nile Tilapia (Oreochromis Niloticus)

J. Kirimi, L. Musalia, J. Munguti
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引用次数: 17

Abstract

ABSTRACT The objective of the work was to evaluate the effect on the nutrient content of replacing fish meal (FM) with blood meal (BM) in fish supplement. Three isonitrogenous diets (35% crude protein) were formulated using FM as the main source of animal protein (BM0); 50% replacement of FM with blood meal (BM50); or 100% replacement of FM with BM (BM100). The chemical composition (ash, crude protein, crude fat and crude fibre) and amino acid composition were determined. Replacement of FM with BM did not affect the proximate composition of the diet apart from ash content which decreased with the level of substitution. Substituting fish meal with blood meal reduced the levels of methionine, lysine, isoleucine, leucine, proline, valine and increased the levels of arginine, phenylanine and alanine in the diet. Amino acid indices revealed that BM0 had more amino acids with the highest chemical scores followed by BM50 and BM100. In all the diets, methionine was the most limiting amino acid. The essential amino acid index of the diets reduced with the level of replacement of FM (0.94, 0.88 and 0.77). The study showed substitution of up to 50% FM with BM gave a useful protein diet and 100% gave almost a poor protein diet.
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血粉替代鱼粉对尼罗罗非鱼饲料化学成分的影响
摘要本试验旨在评价以血粉代替鱼粉对鱼饲料中营养成分含量的影响。以鱼粉为主要动物蛋白(BM0)来源,配制3种等氮饲粮(35%粗蛋白质);50%用血粉替代FM (BM50);或100%用BM (BM100)代替FM。测定了其化学组成(灰分、粗蛋白质、粗脂肪、粗纤维)和氨基酸组成。除灰分含量随替代水平的降低外,用豆粕替代鱼粉对日粮的近似组成没有影响。以血粉替代鱼粉降低了蛋氨酸、赖氨酸、异亮氨酸、亮氨酸、脯氨酸和缬氨酸的水平,提高了精氨酸、苯胺和丙氨酸的水平。氨基酸指标显示,BM0中化学得分最高的氨基酸较多,BM50和BM100次之。在所有日粮中,蛋氨酸是最具限制性的氨基酸。饲粮必需氨基酸指数随鱼粉替代水平的增加而降低(0.94、0.88和0.77)。研究表明,用BM代替高达50%的FM是有益的蛋白质饲料,而100%的BM几乎是糟糕的蛋白质饲料。
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