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时，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，同时考察了其屠宰性能及分割体产率。本试验共选用2400羽肉仔鸡，采用2×4因子设计（2种能量源×4种代谢能水平）的完全随机试验设计，设置5个重复组。试验组通过在日粮中以75 kcal/kg代谢能为梯度添加甘油或大豆油构建：第一组代谢能水平较各阶段需求量低75 kcal/kg；第二组与各阶段需求量持平（分别为2925、2980、3050及3100 kcal/kg）；第三、四组则较对应阶段需求量分别高出75 kcal/kg与150 kcal/kg。无论能量来源为甘油还是大豆油，肉用仔鸡各生长阶段的代谢能需求量经估算分别为：1~7日龄3075 kcal ME/kg饲粮、8~21日龄3130 kcal ME/kg饲粮、22~33日龄3200 kcal ME/kg饲粮、34~42日龄3250 kcal ME/kg饲粮。但在试验前两个生长阶段（1~7日龄与8~21日龄），以甘油作为能量补充源可更有效地提升肉仔鸡的生产性能。