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：本研究以甘油或大豆油作为能量源，考察代谢能（metabolisable energy）水平提升对肉用仔鸡四个生长阶段（1~7日龄、8~21日龄、22~33日龄及34~42日龄）生产性能的影响，并同步分析其对屠宰性能与分割体产率的作用。试验采用2×4析因设计（2种能量源×4种能量水平），完全随机分组，共使用2400羽肉用仔鸡，设5个重复组。试验日粮通过添加甘油或大豆油，以每千克日粮75千卡代谢能为梯度设置能量水平：第一组较各阶段代谢能需要量低75千卡，第二组对应各阶段的代谢能需要量（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要量高75千卡与150千卡。本研究估算得出，无论能量源为甘油还是大豆油，肉用仔鸡1~7、8~21、22~33及34~42日龄阶段的代谢能需要量分别为3075、3130、3200及3250千卡代谢能/千克饲料。不过，在试验前两个生长阶段（1~7日龄与8~21日龄），使用甘油作为能量源可提升生产效率。