Hernandez Jose R, Gulizia Joseph P, Adkins John B, Rueda Martha S, Haruna Samuel I, Pacheco Wilmer J, Downs Kevin M
Department of Poultry Science, Auburn University, Auburn, AL 36849, USA.
School of Agriculture, Middle Tennessee State University, Murfreesboro, TN 37132, USA.
Animals (Basel). 2022 Aug 1;12(15):1952. doi: 10.3390/ani12151952.
The present study evaluated the individual and combined effects of coated and uncoated phytase on broiler performance, tibia characteristics, and residual phytate phosphorus (P) in manure. Two repeated studies were conducted using 240-day-old Cobb 500 by-product male broilers per trial. For each trial, birds were assigned to four treatments with four replicate battery cages per treatment (60 birds/trt) and grown for 21 days. Treatments included: (1) negative control (NC), (2) NC + 1000 phytase units (FTU) coated phytase (C), (3) NC + 1000 FTU uncoated phytase (U), and (4) NC + 500 FTU coated + 500 FTU uncoated phytase (CU). Data were analyzed with a one-way ANOVA and means were separated using Tukey’s HSD. In the pooled data for both trials, all treatments with dietary phytase had a higher body weight (BW) and feed consumption (FC) than the NC on day 21 (p < 0.05). Similarly, a six-point reduction was observed for day 1 to 21 feed conversion (FCR) for U and CU (p < 0.05). All treatments with phytase inclusion differed from the NC in every evaluated parameter for bone mineralization (p < 0.05) and had significantly lower fecal phytate P concentrations compared to the NC (p < 0.05). Overall, bird performance was essentially unaffected by phytase form, indicating that combining phytase forms does not appear to offer any advantage to the evaluated parameters from day 1 to 21.
本研究评估了包膜和未包膜植酸酶对肉鸡生产性能、胫骨特性以及粪便中植酸磷残留量的单独和联合作用。每项试验使用240只1日龄的科宝500雄性肉鸡进行了两项重复试验。每次试验时，将鸡分为四个处理组，每个处理组有四个重复的层叠式鸡笼（每个处理60只鸡），饲养21天。处理组包括：（1）阴性对照组（NC），（2）NC + 1000植酸酶单位（FTU）包膜植酸酶（C），（3）NC + 1000 FTU未包膜植酸酶（U），以及（4）NC + 500 FTU包膜 + 500 FTU未包膜植酸酶（CU）。数据采用单因素方差分析进行分析，均值采用Tukey氏HSD法进行分离。在两项试验的合并数据中，所有添加日粮植酸酶的处理组在第21天时的体重（BW）和采食量（FC）均高于NC组（p < 0.05）。同样，U组和CU组在第1至21天的饲料转化率（FCR）降低了6个百分点（p < 0.05）。所有添加植酸酶的处理组在骨矿化的每个评估参数上均与NC组不同（p < 0.05），并且与NC组相比，粪便中植酸磷浓度显著降低（p < 0.05）。总体而言，肉鸡生产性能基本不受植酸酶形式的影响，这表明在第1至21天，混合植酸酶形式对所评估的参数似乎没有任何优势。
