Effects of phytase and 1,25-dihydroxycholecalciferol on phytate utilization and the quantitative requirement for calcium and phosphorus in young broiler chickens

被引:106
作者
Mitchell, RD [1 ]
Edwards, HM [1 ]
机构
[1] UNIV GEORGIA, DEPT POULTRY SCI, ATHENS, GA 30602 USA
关键词
calcium; phosphorus; phytase; 1,25-dihydroxycholecalciferol; chicken;
D O I
10.3382/ps.0750095
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Three experiments were conducted to determine the effects of supplementing 1,25-dihydroxycholecalciferol [1,25-(OH)(2)D-3] and a commercial phytase product on Ca and P requirements of 0- to 21-d-old broiler males. These experiments were conducted with four levels of dietary Ca and P in corn-soybean diets with and without supplementation of 5 mu g/kg of 1,25-(OH)(2)D-3, 600 units/kg of phytase, and the combination of these supplements. The results show that these levels of phytase and 1,25-(OH)(2)D-3 can replace up to 0.1% of the inorganic P for criteria such as BW, bone ash, and plasma P. Both supplements increased phytate P retention, whereas higher levels of Ca and P decreased phytate P retention. The addition of 1,25-(OH)(2)D-3, but not phytase, reduced Ca requirements and decreased the incidence of tibial dyschondroplasia. The combination of these levels of phytase and 1,25-(OH)(2)D-3 replaced 0.2% inorganic P for criteria such as BW, bone ash, and P rickets. Total dietary P requirements are estimated to be between 0.55 and 0.60% at the levels of phytase and 1,25-(OH)(2)D-3, listed above, or 0.45% when the combination is added. The Ca requirements are estimated to be 0.77% when 1,25-(OH)(2)D-3 is added to the diet and 0.9 to 0.95% when phytase is added.
引用
收藏
页码:95 / 110
页数:16
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