Net absorption of dietary phosphorus from various inorganic sources and effect of fungal phytase on net absorption of plant phosphorus by channel catfish Ictalurus punctatus
Net absorption of dietary phosphorus from various inorganic sources and effect of fungal phytase on net absorption of plant phosphorus by channel catfish Ictalurus punctatus
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DOI：
10.1111/j.1749-7345.1997.tb00285.x
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发表时间：
1997-12-01
影响因子：
2.8
通讯作者：
Lovell, RT
中科院分区：
文献类型：
--
作者：
Eya, JC;Lovell, RT
在28-30 ℃的温度下，在1-m（3）的圆形滚道中，向2岁的癍点叉尾鱼（平均体重765 g）喂食含有来自各种来源之一的补充磷（0.40%）或真菌植酸酶（1，000和3，000单位）的商业型全植物饲料21天。随后，通过从直肠收集粪便的氧化铬指示剂法测定饲料中磷的净吸收。补充磷的净吸收量用基础日粮中吸收的残留磷进行校正。磷酸盐的净吸收系数。磷酸二氢铵、细磨脱氟磷矿粉和磷酸二氢钙分别为88.6、85.4、81.7和81.2%，没有显著差异。磷酸氢钙的净吸收系数显著低于粗磨脱氟磷矿粉和磷酸三钙，分别为55.1%和54.8%，但显著高于粗磨脱氟磷矿粉和磷酸三钙。这些数据是在一般协议与相对生物利用度值的基础上，在其他研究中确定的渠道鲶鱼的生长反应，并应适当的商业饲料中确定可用的磷津贴，并建立磷预算水产养殖饲养业务。全植物基础日粮中磷的净吸收率为31.2%，添加1,000和3,000单位的真菌植酸酶分别显著提高到55.1%和62.5%。
Year-2 channel catfish (average weight 765 g) were fed a commercial-type, all-plant diet containing supplemental phosphorus (0.40%) from one of various sources, or fungal phytase (1,000 and 3,000 units), in 1-m(3) circular raceways for 21 d at a temperature of 28-30 C. subsequently, net absorption of phosphorus from the diets was determined by the chromic oxide indicator method in which feces were collected from the rectum. Net absorption of the supplemental phosphorus was corrected for the absorbed residual phosphorus in the basal diet. Net absorption coefficients for monosodium phosphate. monoammonium phosphate, finely ground defluorinated rock phosphate and monocalcium phosphate were 88.6, 85.4, 81.7, and 81.2%, respectively, and were not significantly different. Net absorption coefficient for dicalcium phosphate was significantly lower, 74.8%, but was significantly higher than those for coarsely ground defluorinated rock phosphate and tricalcium phosphate, which were 55.1 and 54.8%, respectively. These data are in general agreement with relative bioavailability values based on growth response for channel catfish determined in other research, and should be appropriate for determining available phosphorus allowances in commercial feeds and establishing phosphorus budgets in aquaculture feeding operations. The net absorption of phosphorus from the all-plant basal diet was 31.2% and increased significantly to 55.1 and 62.5% with the addition of 1,000 and 3,000 units of fungal phytase, respectively.