The use of exogenous enzymes for poultry has been studied for years. However, there is still limited information on the effects of exogenous lipase supplementation on the growth performance of broilers fed with diets containing reduced nutritional levels. The objective was to investigate the effects of lipase supplementation on growth performance of broilers fed with diets containing different reduced ME, CP, and essential amino acids (EAA). One-day-old Cobb 500 male broilers (n = 480) were distributed in a randomized complete block design, with 4 dietary treatments and 6 replicates of 20 birds. The treatments were as follows: positive control (PC; formulated as per the breeder guideline), negative control (NC; reduction in nutrition levels by 100 kcal/kg in ME, by 1% in CP, and by 5% in EAA), PC diet supplemented with 100 g/t of lipase (PC + Lipase), and NC diet supplemented with 100 g/t of lipase (NC + Lipase). In general, the reduction in nutritional levels (NC) negatively affected body weight gain (BWG) and feed conversion ratio (FCR) compared with PC treatment (P < 0.05). The BWG and FCR were similar between the PC, PC + Lipase, and NC + Lipase groups and better than the NC group, from 1 to 14 d (P < 0.003). From 15 to 28 d, BWG was higher in the PC and PC + Lipase groups than in NC and NC + Lipase groups (P < 0.001), whereas FCR was lower in the PC and PC + Lipase groups than in the NC + Lipase group (P = 0.002). From 29 to 42 d, PC + Lipase and NC + Lipase treatments showed higher BWG than PC and NC treatments (P < 0.001). Most importantly, the use of lipase in NC diets from 1 to 42 d was able to ameliorate the negative effects of a low-nutrient diet, leading to results similar to the PC diet.

研究外源酶在家禽中的使用已有多年。然而，关于补充外源脂肪酶对饲喂营养水平降低的日粮的肉鸡生长性能影响的信息仍然有限。目的是研究脂肪酶对肉鸡日粮中含有不同的降低的ME，CP和必需氨基酸（EAA）的日粮生长的影响。一天大的Cobb 500雄性肉鸡（n = 480）以完全随机区组设计分配，进行了4种饮食处理和20只鸡的6次重复试验。处理方法如下：阳性对照（PC；根据育种指南制定），阴性对照（NC; 降低了我的营养水平100 kcal / kg，CP降低1％，EAA降低5％），PC饮食添加了100 g / t脂肪酶（PC +脂肪酶）和NC饮食添加了100 g / t t的脂肪酶（NC +脂肪酶）。通常，与PC处理相比，营养水平（NC）的降低会对体重增加（BWG）和饲料转化率（FCR）产生负面影响（P <0.05）。PC，PC +脂肪酶和NC +脂肪酶组之间的BWG和FCR相似，并且在1至14 d时优于NC组（P <0.003）。在15至28天时，PC和PC +脂肪酶组的BWG高于NC和NC +脂肪酶组（P <0.001），而PC和PC +脂肪酶组的FCR低于NC +脂肪酶组。 （P  = 0.002）。在29至42 d时，PC +脂肪酶和NC +脂肪酶治疗的BWG高于PC和NC治疗（P <0.001）。最重要的是，在1至42天的NC饮食中使用脂肪酶能够减轻低营养饮食的负面影响，从而获得与PC饮食相似的结果。