Javadi Mehran, Cerisuelo Alba, Cambra-López María, Macías-Vidal Judit, Donadeu Andrés, Dupuy Javier, Carpintero Laura, Ferrer Pablo, Pascual Juan José
Institute for Animal Science and Technology, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
Centro de Investigación y Tecnología Animal, Instituto Valenciano de Investigaciones Agrarias, 12400 Segorbe, Spain.
Animals (Basel). 2022 May 31;12(11):1418. doi: 10.3390/ani12111418.
Two trials varying in duration (short- and long-term) were conducted to evaluate the effects of providing deficient (NC) or sufficient (PC) Ca and P levels, and different doses of a new phytase (250, 500, and 1000 FTU/kg feed), in broiler feed on growth performance, nutrient digestibility and retention, and tibia mineralization. A total of 80 and 490 male chicks (Ross) of 21 and 1 days of age were used in the short- and long-term trials, respectively. In the long-term trial, chicks fed NC diets showed a lower (p < 0.05) average daily gain and feed intake compared to chicks fed PC and a greater (p < 0.05) feed conversion ratio compared to 500 and 1000 FTU/kg feed during the starting period. Regarding the effects on minerals’ and nutrients’ coefficients of retention, animals fed NC showed a significantly higher digestibility for P than those fed the PC diet in the long-term trial. Additionally, feeding 250 to 500 FTU/kg diets increased most of the nutrients’ digestibility in the short-term but only P digestibility in the long-term trial. Tibia mineralization increased linearly with phytase addition (p < 0.05) only in the long-term trial. In conclusion, the effects of dietary mineral and phytase levels on growth performance are more noticeable in young animals. In addition, the duration of the trial is key due to a possible adaptation phenomenon of birds to low P supplementary levels.
进行了两项持续时间不同（短期和长期）的试验，以评估在肉鸡饲料中提供缺乏（NC）或充足（PC）的钙和磷水平，以及不同剂量的新型植酸酶（250、500和1000 FTU/kg饲料）对生长性能、养分消化率和保留率以及胫骨矿化的影响。短期和长期试验分别使用了80只21日龄和490只1日龄的雄性雏鸡（罗斯品种）。在长期试验中，与饲喂PC日粮的雏鸡相比，饲喂NC日粮的雏鸡在起始期的平均日增重和采食量较低（p<0.05），与饲喂500和1000 FTU/kg饲料的雏鸡相比，饲料转化率更高（p<0.05）。关于对矿物质和养分保留系数的影响，在长期试验中，饲喂NC日粮的动物对磷的消化率显著高于饲喂PC日粮的动物。此外，在短期试验中，饲喂250至500 FTU/kg日粮可提高大多数养分的消化率，但在长期试验中仅提高磷的消化率。仅在长期试验中，添加植酸酶后胫骨矿化呈线性增加（p<0.05）。总之，日粮矿物质和植酸酶水平对生长性能的影响在幼龄动物中更为明显。此外，由于禽类可能对低磷补充水平产生适应现象，试验持续时间很关键。
