Microbial Phytase Can Replace Inorganic Phosphorus Supplements in Channel Catfish Ictalurus punctatus Diets
Microbial Phytase Can Replace Inorganic Phosphorus Supplements in Channel Catfish Ictalurus punctatus Diets
复制标题
DOI：
10.1111/j.1749-7345.1997.tb00287.x
复制
发表时间：
1997-12
影响因子：
2.8
通讯作者：
Meng H. Li;E. Robinson
中科院分区：
文献类型：
--
作者：
Meng H. Li;E. Robinson
在实验室条件下，用含有0、250、500和750单位/kg微生物植酸酶的四种实用饲料和含有1%饲料级磷酸二钙（但不含微生物植酸酶）的饲料喂养癍点叉尾（Ictalurus punctatus）幼鱼（初始重量：6.8g/鱼）12周。与饲喂不含微生物植酸酶的基础日粮的鱼相比，饲喂含有250单位/kg及以上微生物植酸酶的日粮的鱼消耗更多的饲料，获得更多的体重，并且具有较低的饲料转化率（FCR）。与基础日粮和含微生物植酸酶的日粮相比，饲喂含磷酸二钙的日粮的鱼具有中等的增重和饲料转化率。骨灰和磷浓度较低的鱼喂养的基础饮食比其他饮食喂养的鱼。在鱼的增重，饲料消耗量，饲料转化率，骨灰和骨磷之间没有观察到差异饲料中含有不同水平的微生物植酸酶。喂食含有磷酸二钙的饲料的鱼比喂食含有微生物植酸酶的饲料的鱼具有更低的骨磷浓度。饲料中含有微生物植酸酶的鱼的粪便磷浓度较低，比基础饲料和饲料中含有磷酸二钙的鱼。本研究结果表明，在实际饲料中添加250单位/kg的微生物植酸酶可以有效地提高植酸磷的生物利用率，并有可能取消在癍点叉尾鮰饲料中使用无机磷补充剂。然而，这些数据必须在池塘中进行的试验中进行验证，然后再建议从癍点叉尾鮰饲料中去除补充磷。
.– Juvenile channel catfish Ictalurus punctatus (initial weight: 6.8 g/fish) were fed four practical diets containing 0, 250, 500, and 750 units of microbial phytase/kg and a diet containing 1% feed grade dicalcium phosphate (but no microbial phytase) under laboratory conditions for 12 wk. Fish fed the diets containing 250 units of microbial phytase/kg and above consumed more feed, gained more weight, and had a lower feed conversion ratio (FCR) in comparison to fish fed the basal diet containing no microbial phytase. Fish fed the diet containing dicalcium phosphate had intermediate weight gain and feed conversion ratio as compared to fish fed the basal diet and diets containing microbial phytase. Bone ash and phosphorus concentrations were lower for fish fed the basal diet than for fish fed other diets. No differences in weight gain, feed consumption, FCR, bone ash and bone phosphorus were observed among fish fed the diets containing various levels of microbial phytase. Fish fed the diet containing dicalcium phosphate had a lower bone phosphorus concentration than fish fed diets containing microbial phytase. Fecal phosphorus concentrations were lower for fish fed the diets containing microbial phytase than for fish fed the basal diet and the diet containing dicalcium phosphate. Results from the present study indicated that addition of 250 units of microbial phytase/kg to practical diets can effectively improve bioavailability of phytate phosphorus to channel catfish and may possibly eliminate the use of an inorganic phosphorus supplement in channel catfish diets. However, these data must be verified in trials conducted in ponds, prior to recommending removal of supplemental phosphorus from channel catfish diets.