The effect of dietary phytase and various available phosphorus levels on performance and egg quality in Japanese quail

SUMMARY Birds show poor utilization of phytic phosphorus in their diets because of the lack of endogenous enzymes to digest phosphorus and make it bioavailable. Therefore, the objective of this study was to evaluate phytase supplementation in the diets of laying quails. Eighty quails were used in a completely randomized experimental design with five treatments and four replicates of four birds each. The treatments were as follows: 0.35% Pd; 0.20% Pd; 0.20% Pd + 500FTUs of phytase; 0.09% Pd; 0.09% Pd + 500 FTUs of phytase. The birds were housed in metallic batteries during a trial period of 21 days, for evaluation of egg production, egg weight, feed intake and feed conversion. After being collected, the eggs were sent to the nutrition laboratory of the department of zootechnics of the CEO/Udesc, where analyses of albumin, yolk and shell quality were performed. The results were subjected to analysis of variance, and the differences between the averages were compared using the Tukey test at 5% of significance. No differences (P> 0.05) were observed in terms of performance and egg quality parameters. We conclude that the inclusion of phytase in the diet of laying quails can be accomplished without compromising the performance and quality of the eggs. Additionally, 0.09% of 22 disponible phosphorus can be used to grant adequate performance for 21 days.

摘要：鸟类因缺乏可将磷消化并使其具备生物可利用性的内源酶，对日粮中的植酸磷（phytic phosphorus）利用率极低。为此，本研究旨在评估日粮添加植酸酶（phytase）对产蛋鹌鹑的应用效果。本试验采用完全随机试验设计，选用80只产蛋鹌鹑，设置5个处理组，每组设4个重复，每个重复包含4只鹌鹑。处理组具体如下：0.35% Pd、0.20% Pd、0.20% Pd + 500 FTU植酸酶、0.09% Pd、0.09% Pd + 500 FTU植酸酶。试验周期为21天，将鹌鹑饲养于层叠式金属笼架中，以评估产蛋率、蛋重、采食量及饲料转化率。鸡蛋收集完成后，被送至CEO/Udesc畜牧动物学系的营养实验室，开展蛋清、蛋黄及蛋壳品质相关分析。试验数据采用方差分析（analysis of variance）进行统计处理，组间均值差异采用显著性水平为5%的Tukey检验（Tukey test）进行多重比较。结果显示，产蛋性能与蛋品质参数均无显著差异（P>0.05）。本研究得出结论：在产蛋鹌鹑日粮中添加植酸酶，不会对其产蛋性能及蛋品质产生负面影响。此外，日粮中0.09%的22 disponible phosphorus可满足21天饲养周期内的良好生产性能需求。