Kayan Autchara, Prasongsook Sombat, Poeikhampha Theerawit
Department of Animal Science, Faculty of Agriculture, Kasetsart University, Ngam Wong Wan, Bangkok, 10900, Thailand.
Vet World. 2025 Jan;18(1):155-161. doi: 10.14202/vetworld.2025.155-161. Epub 2025 Jan 22.
The inclusion of supplementary enzymes, such as phytase and xylanase, in poultry diets enhances nutrient digestibility and reduces excreta output, minimizing environmental impact. This study aimed to evaluate the effects of phytase and xylanase supplementation on laying performance, egg quality, apparent metabolizable energy (AME), and phosphorus utilization in laying hens.
A total of 576 laying hens, aged 47 weeks, were randomly assigned to four dietary treatments: (T1) a control diet, (T2) a negative control diet with reduced energy and phosphorus, (T3) T2 supplemented with phytase (50 g/ton) and xylanase (100 g/ton), and (T4) T2 supplemented with phytase and NSP enzyme mix. The study was conducted over 12 weeks. Data on body weight, laying performance, egg quality, AME, and phosphorus utilization were analyzed using a one-way analysis of variance, with statistical significance set at p < 0.05.
No significant differences were observed in hen-day egg production, egg weight, or feed intake across groups. However, enzyme supplementation (T3 and T4) significantly reduced feed costs per kg egg and feed cost per egg compared to the control (p < 0.05). Eggshell strength improved significantly in T3 and T4 groups, while yolk color declined in these groups compared to T1 (p < 0.05). Other quality metrics, such as albumin height and Haugh units, showed no significant differences. Apparent metabolizable energy, phosphorus retention time, and feces scores were not significantly affected by dietary treatments.
Phytase and xylanase supplementation in diets with reduced nutrient content effectively reduced production costs while maintaining laying performance and improving eggshell strength. These findings support the use of these enzymes as cost-efficient tools in poultry production without compromising egg quality.
在家禽日粮中添加植酸酶和木聚糖酶等辅助酶可提高养分消化率并减少排泄物产量，从而将对环境的影响降至最低。本研究旨在评估添加植酸酶和木聚糖酶对蛋鸡产蛋性能、蛋品质、表观代谢能（AME）和磷利用率的影响。
总共576只47周龄的蛋鸡被随机分配到四种日粮处理组：（T1）对照日粮，（T2）能量和磷含量降低的阴性对照日粮，（T3）在T2基础上添加植酸酶（50克/吨）和木聚糖酶（100克/吨），（T4）在T2基础上添加植酸酶和非淀粉多糖酶混合物。本研究持续了12周。使用单因素方差分析对体重、产蛋性能、蛋品质、AME和磷利用率的数据进行分析，统计学显著性设定为p < 0.05。
各处理组间的日产蛋率、蛋重或采食量均未观察到显著差异。然而，与对照组相比，添加酶（T3和T4）显著降低了每千克鸡蛋的饲料成本和每个鸡蛋的饲料成本（p < 0.05）。T3和T4组的蛋壳强度显著提高，而与T1组相比，这些组的蛋黄颜色有所下降（p < 0.05）。其他品质指标，如蛋白高度和哈夫单位，未显示出显著差异。日粮处理对表观代谢能、磷保留时间和粪便评分没有显著影响。
在营养成分降低的日粮中添加植酸酶和木聚糖酶可有效降低生产成本，同时维持产蛋性能并提高蛋壳强度。这些研究结果支持在不影响蛋品质的情况下，将这些酶作为家禽生产中具有成本效益的工具使用。
