花鲈对不同饲料原料的表观消化率

APPARENT DIGESTIBILITY COEFFICIENTS OF VARIOUS FEED INGREDIENTS FOR JAPANESE SEA BASS(LATEOLABRAX JAPONICUS)

试验以Cr2 O3 为指示物 ,以 70 %基础饲料和 30 %的待测饲料原料组成试验饲料 ,测定花鲈对红鱼粉、豆粕、花生粕、菜籽粕、肉骨粉和棉籽粕中干物质、粗蛋白、粗脂肪、能量和氨基酸的表观消化率。在水温 2 5± 1℃的试验条件下 ,花鲈对鱼粉、豆粕、花生粕的干物质表观消化率均在 6 0 %以上 ;对鱼粉、豆粕、花生粕和菜籽粕的蛋白质、脂肪的表观消化率都在 80 %以上 ;花鲈对能量的表观消化率变化范围在 16 99%— 83 96 %。测得每种原料的 16种氨基酸的表观消化率 :花鲈对原料氨基酸消化率的变化与对蛋白质消化率的变化相一致 ,除了赖氨酸、缬氨酸、蛋氨酸之外 ,花鲈对肉骨粉中氨基酸的利用率最低。花鲈对饼粕类原料中的含硫氨基酸 (如蛋氨酸 )的表观消化率低于其他氨基酸 ,对鱼粉中氨基酸利用率最低的为组氨酸 ,对肉骨粉中氨基酸利用率最低的为苏氨酸。

A digestive experiment was conducted on Japanese sea bass (Lateolabrax japonicus) weighing 30±1.80g at 25±1℃. Chromic oxide(Cr 2O 3) was used as the inert indicator and apparent digestibility of dry matter, protein, lipid, energy and amino acids in various feed ingredients were determined. The test diets were composed of 70% reference diet and 30% test ingredient. Apparent digestibility of dry matter of fish meal, soybean meal and peanut meal was higher than 60%. Japanese sea bass had high digestibility of fat and protein in fish meal, soybean meal,peanut meal and rapeseed meal (more than 80%). The highest digestibility of energy appeared in fish meal (83.96%) and the lowest digestibility appeared in cotton seed meal(16.99%). Apparent digestibility coefficients of 16 amino acids in each test ingredient were determined and they showed similar trend to protein digestibility. Amino acid availability values, except for histidine, methionine and valine,in meat and bone meal for fish were lower than those in other test ingredients. Oilseed meal showed lower availability for sulphur amino acids (e.g., methionine) than that for other amino acids. Histidine availability values was lowest in fish meal while threonine availability values was lowest in meat and bone meal.