The purpose of this study was to compare zinc sulfate and zinc threonine chelate based on Zn bioavailability and performance of broiler chicks. The study was conducted in a completely randomized design with 256 day-old Ross 308 chicks and eight treatments including control treatment (no zinc supplementation), three levels of zinc sulfate and zinc threonine chelate (40, 80, and 120 mg zinc per kg feed), and a common commercial chelate (Bioplex Zn®) supply 40 mg zinc per kg feed. The results of total period showed that threonine chelate group had the highest live weight compared with other treatments and lowest feed conversion ratio belonged to 80 and 120 ppm of zinc threonine chelate (p < 0.05). Zinc threonine chelate and commercial chelate treatments had the lowest cholesterol and LDL levels compared with other treatments (p < 0.05). Zinc chelate threonine which contains 80 and 120 ppm of zinc had the highest HDL and superoxide dismutase enzymes and the lowest heterophile to lymphocyte ratio compared with other treatments (p < 0.05). Relative bioavailability of zinc threonine to zinc sulfate based on body weight, feed conversion ratio, cholesterol, LDL, HDL, superoxide dismutase enzyme, ash, and zinc content in tibia were 418.75, 173.91, 131.38, 159.43, 278.63, 193.45, 156.46, and 117.65%, respectively. According to the results of broiler performance and other traits measured in this study, it seems that the use of 80 ppm of zinc threonine chelate in the broiler diet is recommended in comparison with zinc sulfate levels and other threonine chelate levels.

中文翻译：

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基于锌的生物利用度和肉鸡生产性能的硫酸锌和苏氨酸锌的比较。

本研究的目的是根据锌的生物利用度和肉鸡的生产性能来比较硫酸锌和苏氨酸锌螯合物。该研究采用完全随机设计，对 256 日龄的 Ross 308 雏鸡进行了八种处理，包括对照处理（不补充锌）、三种水平的硫酸锌和苏氨酸锌螯合物（每公斤饲料 40、80 和 120 毫克锌） ），以及常见的商业螯合物（Bioplex Zn®）每公斤饲料供应 40 毫克锌。总周期结果显示，与其他处理相比，苏氨酸螯合物组的活重最高，饲料转化率最低的是苏氨酸锌螯合物80和120 ppm（p < 0.05）。与其他治疗相比，苏氨酸锌螯合物和商业螯合物治疗的胆固醇和低密度脂蛋白水平最低（p < 0.05）。与其他处理相比，含有 80 和 120 ppm 锌的锌螯合苏氨酸具有最高的 HDL 和超氧化物歧化酶以及最低的异嗜性细胞与淋巴细胞比率 (p < 0.05)。基于体重、饲料转化率、胆固醇、LDL、HDL、超氧化物歧化酶、灰分和胫骨中锌含量的苏氨酸锌与硫酸锌的相对生物利用度分别为 418.75、173.91、131.38、159.43、278.63、193.45、156.46 和分别为 117.65%。根据本研究中测量的肉鸡生产性能和其他性状的结果，与硫酸锌水平和其他苏氨酸螯合物水平相比，似乎建议在肉鸡日粮中使用 80 ppm 苏氨酸锌螯合物。