O'Doherty J V, Gahan D A, O'Shea C, Callan J J, Pierce K M
School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Lyons Research Farm, Newcastle, 6 Dublin, Ireland.
Animal. 2010 Oct;4(10):1634-40. doi: 10.1017/S1751731110000807.
Two experiments, a performance experiment and a mineral balance study, were conducted on grower-finisher pigs (42 to 101 kg live weight) to investigate the effects of Peniophora lycii phytase enzyme and 25-hydroxyvitamin D3 (25-OHD3) on growth performance, carcass characteristics, nutrient retention and excretion, and bone and blood parameters. The two experiments were designed as a 2 × 2 factorial (two levels of phytase and two levels of 25-OHD3). The four diets were T1, low-phosphorous diet; T2, T1 + phytase; T3, T1 + 25-OHD3 and T4, T1 + phytase + 25-OHD3 diet. In all, 25 μg of 25-OHD3 was used to replace 1000 IU of vitamin D3 in diets T3 and T4. Diets were pelleted (70°C) and formulated to contain similar concentrations of energy (13.8 MJ DE/kg), lysine (9.5 g/kg) and digestible phosphorus (P; 1.8 g/kg). Neither the inclusion of phytase nor 25-OHD3 in the diet had any effect on pig performance. There was an interaction between phytase and 25-OHD3 on calcium (Ca) and P retention (P < 0.01) and on the apparent digestibility of ash (P < 0.01), P (P < 0.001) and Ca (P < 0.001). Pigs offered phytase diets only, had a higher retention of Ca and P and digestibility of ash (P < 0.01), P (P < 0.001) and Ca (P < 0.01) compared with pigs offered unsupplemented diets. However, when the combination of phytase and 25-OHD3 were offered, no effects were detected compared with 25-OHD3 diets only. Pigs fed phytase diets had higher bone ash (P < 0.01), bone P (P < 0.01) and bone Ca (P < 0.05) concentrations compared with pigs offered non-phytase diets. In conclusion, pigs offered phytase diets had a significantly increased bone ash, Ca and P than pigs offered unsupplemented phytase diets. However, there was no advantage to offering a combination of phytase and 25-OHD3 on either bone strength or mineral status compared to offering these feed additives separately.
对生长育肥猪（活重42至101千克）进行了两项试验，一项性能试验和一项矿物质平衡研究，以调查枸杞拟层孔菌植酸酶和25-羟基维生素D3（25-OHD3）对生长性能、胴体特性、养分保留与排泄以及骨骼和血液参数的影响。这两项试验设计为2×2析因试验（植酸酶两个水平和25-OHD3两个水平）。四种日粮分别为T1，低磷日粮；T2，T1+植酸酶；T3，T1+25-OHD3；T4，T1+植酸酶+25-OHD3日粮。在日粮T3和T4中，总共使用25微克25-OHD3替代1000国际单位维生素D3。日粮经制粒（70°C），配方设计使其含有相似浓度的能量（13.8兆焦消化能/千克）、赖氨酸（9.5克/千克）和可消化磷（P；1.8克/千克）。日粮中添加植酸酶或25-OHD3对猪的性能均无任何影响。植酸酶和25-OHD3在钙（Ca）和磷保留方面存在交互作用（P<0.01），在灰分（P<0.01）、磷（P<0.001）和钙（P<0.001）的表观消化率方面也存在交互作用。仅饲喂植酸酶日粮的猪，与饲喂未添加日粮的猪相比，钙和磷的保留以及灰分（P<0.01）、磷（P<0.001）和钙（P<0.01）的消化率更高。然而，当同时提供植酸酶和25-OHD3组合时，与仅提供25-OHD3日粮相比未检测到影响。与饲喂非植酸酶日粮的猪相比，饲喂植酸酶日粮的猪骨灰分（P<0.01）、骨磷（P<0.01）和骨钙（P<0.05）浓度更高。总之，与饲喂未添加植酸酶日粮的猪相比，饲喂植酸酶日粮的猪骨灰分、钙和磷显著增加。然而，与分别提供这些饲料添加剂相比，同时提供植酸酶和25-OHD3组合在骨骼强度或矿物质状态方面并无优势。
