Maria Douglas Drebes Brunhaus, Vieira Sergio Luiz, Horn Raquel Medeiros, Marchi Maria Luísa Adachi, Favero Andre
Department of Animal Science, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 7712, Porto Alegre 91540-000, RS, Brazil.
Animals (Basel). 2024 Nov 27;14(23):3423. doi: 10.3390/ani14233423.
The study aimed to evaluate phytase effects on the availability of zinc (Zn) from corn and soybean meal feeds for broiler chickens, whereas, in parallel, Zn requirements were investigated. A total of 640 Cobb × Cobb 500 male chicks were fed a Zn-deficient diet (18.87 ± 0.87 mg/kg Zn) until 7 days of age. The experiment was a 2 × 5 factorial with 10 treatments (feeds with or without phytase × 5 increasing dietary Zn levels) with 8 replications of 8 birds each. Supplemental Zn sulfate heptahydrate was used (measurements of the Zn analyzed in the feeds were 30.1 ± 0.73, 61.6 ± 0.13, 90.4 ± 1.60, 123.6 ± 1.99, and 151.9 ± 1.84 mg/kg, respectively). There were no interactions between phytase and Zn for any evaluated response. Phytase improved broiler performance and increased plasma myo-inositol, Zn content in the liver and tibia, Zn retention, and digestible energy ( < 0.05). No significant impact of dietary Zn was found on broiler performance ( > 0.05) except for Zn excretion and tibia Zn content. Adding phytase at 4000 FYT increased the apparent ileal Zn digestibility by 98% and Zn retention by 13.7%, whereas Zn supplementation of up to 151.9 mg/kg did not impact broiler performance.
本研究旨在评估植酸酶对肉鸡玉米和豆粕饲料中锌（Zn）利用率的影响，同时对锌的需求量进行研究。总共640只科宝×科宝500雄性雏鸡被饲喂低锌日粮（锌含量为18.87±0.87毫克/千克）直至7日龄。试验采用2×5析因设计，有10种处理（添加或不添加植酸酶的饲料×5个递增的日粮锌水平），每个处理8个重复，每个重复8只鸡。使用了补充的七水硫酸锌（饲料中分析的锌含量分别为30.1±0.73、61.6±0.13、90.4±1.60、123.6±1.99和151.9±1.84毫克/千克）。对于任何评估的反应，植酸酶和锌之间均无交互作用。植酸酶改善了肉鸡的生产性能，提高了血浆肌醇、肝脏和胫骨中的锌含量、锌保留率以及消化能（P<0.05）。除了锌排泄和胫骨锌含量外，日粮锌对肉鸡生产性能没有显著影响（P>0.05）。添加4000菲汀单位的植酸酶使回肠锌表观消化率提高了98%，锌保留率提高了13.7%，而补充高达151.9毫克/千克的锌对肉鸡生产性能没有影响。
