Increased metabolisable energy from glycerine or soybean oil in broilers

ABSTRACT The effect of increased levels of metabolisable energy with glycerine or soybean oil was evaluated in the performance of broilers at four growth stages (1 to 7, 8 to 21, 22 to 33 and 34 to 42 days), in addition to the carcass and cut yield. A total of 2,400 birds were used in a completely randomised design in a 2 x 4 factorial scheme (two sources x four energy levels), with five replications. The treatments were determined by including glycerine or soybean oil at intervals of 75 kcal/kg of metabolisable energy in the diet: the first level with 75 kcal less than the requirement, the second corresponding to the requirement for each stage (2925, 2980, 3050 and 3100 Kcal), and the third and fourth levels with 75 kcal and 150 kcal more than the required value for the stage under evaluation. The metabolisable energy requirement for broilers, irrespective of the energy source (glycerine or soybean oil), was estimated at 3,075, 3.130, 3,200 and 3,250 kcal ME/kg feed, for stages 1 to 7, 8 to 21, 22 to 33 and 34 to 42 days respectively. However, the use of glycerine as a source of increased energy promoted better performance efficiency during the first two stages (1 to 7 and 8 to 21 days of age).

摘要：本研究评估了以甘油或大豆油作为能量来源提升日粮代谢能（metabolisable energy, ME）水平，对4个生长阶段（1~7、8~21、22~33及34~42日龄）肉用仔鸡（broilers）生产性能的影响，同时考察其对屠宰性能及分割体产率的作用。本试验采用完全随机设计，设置2×4因子方案（2种能量源×4个能量水平），共使用2400羽肉仔鸡，设置5个重复组。试验处理通过在日粮中添加甘油或大豆油，以每千克日粮代谢能75千卡为梯度设置：第一组较对应生长阶段的代谢能需求量低75千卡，第二组为各阶段的代谢能需求量（分别为2925、2980、3050及3100千卡），第三、第四组则分别较对应阶段的需求量高75千卡和150千卡。无论能量源为甘油还是大豆油，肉用仔鸡在1~7、8~21、22~33及34~42日龄四个生长阶段的代谢能需求量分别估算为3075、3130、3200及3250千卡ME/kg日粮。不过，以甘油作为能量补充源时，肉仔鸡在前期两个生长阶段（1~7日龄和8~21日龄）的生产性能表现更优。