Effects of calcium and nonphytate phosphorus concentrations on phytase efficacy in broiler chicks

被引:73
作者
Driver, JP [1 ]
Pesti, GD [1 ]
Bakalli, RI [1 ]
Edwards, HM [1 ]
机构
[1] Univ Georgia, Dept Poultry Sci, Athens, GA 30602 USA
关键词
calcium; nonphytate phosphorus; broiler chick; phytase;
D O I
10.1093/ps/84.9.1406
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Phytase supplementation over a range of different levels of dietary Ca and nonphytate phosphorus (NPP) was investigated by comparing surface response curves from regression equations generated with (experiment 1)and without (experiment 2) phytase using various performance and bone quality parameters. Cobb x Cobb broiler chicks were raised from 0 to 16 d in 2 experiments using corn-soybean meal based diets. Experiment 1 used a 4 x 4 factorial arrangement with diets formulated to contain combinations of 4 levels of Ca: 0.38, 0.58, 0.78, and 0.98% and 4 levels of NPP: 0.2, 0.3, 0.4, and 0.5%. Experiment 2 used a composite rotatable design in which rations were formulated to contain dietary Ca levels of 0.38, 0.47, 0.68, 0.89, and 0.98% and NPP levels of 0.20, 0.24, 0.35, 0.46, and 0.50%. An extra point was included in the design to contain the lowest Ca and lowest NPP levels (0.38% Ca and 0.20% NPP). All combinations of Ca and NPP were fed with 657 phytase units/kg Natuphos 5000 phytase, plus 4 combinations (0.38% Ca and 0.20%) NPP, 0.47%, Ca and 0.24%,, NPP, 0.68%, Ca and 0.35%, NPP, and 0.89% Ca and 0.46% NPP) were fed without phytase to determine the suitability of comparing Multiple regression response surfaces for particular variables among experiments. Comparison of surface with and without phytase, showed that growth and bone quality responses to phytase were greatest at low NPP levels and high Ca levels, and these decreased when the Ca level was reduced or when the NPP level was increased. A third experiment confirmed that phytase elicits a greater response at higher Ca levels and lower NPP levels (0.86%. Ca and 0.20%, NPP) versus low Ca levels and low NPP levels (0.47%, Ca and 0.24%, NPP). The data demonstrated why it is impossible to determine a single NPP equivalency value for phytase supplement.
引用
收藏
页码:1406 / 1417
页数:12
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