Effect of Selenium Supplementation in Broiler Diets on Breast Meat Deposition

ABSTRACT The objective of the study was to evaluate the deposition of selenium in the breast muscle of broilers fed different selenium sources during different periods. Two experiments were carried out with broilers fed 45% sodium selenite (SS) or 2% hydroxy-selenomethionine (HSM) to determine the selenium deposition rate in the muscle tissue. In Experiment 1, 48 broilers were distributed in a completely randomized design with six treatments with eight replicates each, consisting of diets containing 0 Se (0), 200 or 400 µgSS/kg (200 SS, 400 SS), or 100, 200, or 300 µgHSM/kg (100 HSM, 200 HSM, 300 HSM) for 10 days. The highest Se breast content was obtained with 300 HSM diet, followed by 200 SS diet compared to the other treatments. Experiment 2 had a completely randomized design following a plot scheme subdivided in time, and consisted of a basal diet supplemented with 300 µg SS/kg (300 SS), basal diet with 200 µg HSM/kg (200 HSM) or basal diet supplemented with 100 µgSS/kg and 100 µgHSM/kg (100 SS+100 HSM). Dietary Se sources did not influence Se breast content measured on days 3 and 6. However, on days 9 and 12, higher Se breast contents were measured in broilers fed 200 HSM and 100 SS+100 HSM diets compared with those fed 300 SS diet. In conclusion, the supplementation of broiler diets with HSM at 2% for a short period is more efficient to increase selenium deposition in the breast muscle than sodium selenite.

摘要
本研究旨在评估不同饲喂时期下，饲喂不同硒源的肉鸡胸肌中硒的沉积情况。本研究开展两项试验，分别选用含硒量45%的亚硒酸钠（sodium selenite, SS）制剂或含硒量2%的羟基硒代蛋氨酸（hydroxy-selenomethionine, HSM）制剂饲喂肉鸡，以测定其肌肉组织的硒沉积速率。
试验1将48只肉鸡采用完全随机设计，分为6个处理组，每组设置8个重复。日粮处理分别为：无硒基础日粮（0组）、添加200或400 μg/kg日粮硒（以亚硒酸钠形式提供，记为200 SS组、400 SS组），以及添加100、200或300 μg/kg日粮硒（以羟基硒代蛋氨酸形式提供，记为100 HSM组、200 HSM组、300 HSM组），试验周期为10天。结果显示，饲喂300 HSM组日粮的肉鸡胸肌硒含量最高，其次为200 SS组，均优于其余处理组。
试验2采用完全随机设计，设置时间亚区组方案，日粮处理包括：添加300 μg/kg日粮硒（以亚硒酸钠形式提供，记为300 SS组）的基础日粮、添加200 μg/kg日粮硒（以羟基硒代蛋氨酸形式提供，记为200 HSM组）的基础日粮，以及同时添加100 μg/kg日粮硒（亚硒酸钠形式）与100 μg/kg日粮硒（羟基硒代蛋氨酸形式）的基础日粮（记为100 SS+100 HSM组）。在试验第3天和第6天检测时，日粮硒源对肉鸡胸肌硒含量无显著影响；但在第9天和第12天，饲喂200 HSM组与100 SS+100 HSM组日粮的肉鸡胸肌硒含量显著高于300 SS组。
综上，与亚硒酸钠相比，短期饲喂添加2%羟基硒代蛋氨酸的肉鸡日粮，可更高效地提升胸肌中的硒沉积量。