PERFORMANCE OF BROILERS FED DIFFERENT DIETARY CHOLINE SOURCES AND LEVELS

Abstract Two experiments were carried out to evaluate the bioequivalence of a commercial phosphatidylcholine source (Biocholine™) as an alternative to choline chloride and the choline requirements of broilers of a fast-growth strain. In Experiment I, 672 broilers were fed four Biocholine™ levels (0, 100, 200, or 300 mg/kg) and three choline levels (200, 400, or 600 mg/kg) supplied as choline chloride between 4 and 28 days (d) of age. In Experiment II, 462 broilers received diets supplemented with 0, 200, 400, 600 or 800 mg/kg choline as choline chloride. In both experiments, diets were based on white rice, soybean meal, and corn gluten. In Experiment I, birds fed choline chloride presented higher feed intake than those fed Biocholine™. Both choline supplements linearly improved feed conversion ratio (FCR) between 15 and 28 d, but the curves presented different slopes, showing that one unit (U) of Biocholine™ was equivalent to 2.52 U of choline supplied as choline chloride. In Experiment II, the supplementation of choline had a quadratic effect on weight gain (WG) but did not affect FCR. Choline requirements for WG were determined as 778, 632, and 645 mg/kg for 1-7, 1-35, and 1-42 d of age, respectively.

摘要：本研究开展两项试验，旨在评估商用磷脂酰胆碱（phosphatidylcholine）来源产品Biocholine™作为氯化胆碱（choline chloride）替代品的生物等效性，以及快速生长品系肉仔鸡的胆碱需求量。试验一选取672只肉仔鸡，在4至28日龄期间，为其饲喂4个梯度的Biocholine™（0、100、200或300 mg/kg），以及3个梯度的氯化胆碱形式胆碱（200、400或600 mg/kg）。试验二选取462只肉仔鸡，饲喂添加了0、200、400、600或800 mg/kg氯化胆碱形式胆碱的日粮。两项试验的日粮均以白大米、豆粕和玉米谷朊粉为基础。试验一结果显示，饲喂氯化胆碱的肉仔鸡采食量高于饲喂Biocholine™的组别；两种胆碱补充剂均可线性改善15至28日龄的饲料转化率（Feed Conversion Ratio, FCR），但二者的曲线斜率存在差异，表明1单位Biocholine™等效于2.52单位氯化胆碱形式的胆碱。试验二结果表明，胆碱补充对增重（Weight Gain, WG）存在二次效应，但对饲料转化率无显著影响；1-7日龄、1-35日龄和1-42日龄肉仔鸡的增重所需胆碱需求量分别为778、632和645 mg/kg。