Department of Animal Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
Department of Animal Nutrition, Federal University of Agriculture, Abeokuta, Nigeria.
Anim Sci J. 2020 Jan-Dec;91(1):e13381. doi: 10.1111/asj.13381.
This experiment was carried out to evaluate the effect of reduced dietary crude protein (CP) levels supplemented with or without exogenous phytase on growing pigs. Six dietary treatments arranged in a 3 × 2 factorial arrangements of 3 CP levels (containing 14%, 16%, and 18% CP) supplemented each with or without 5,000 FTU/g phytase enzyme. Thirty growing pigs (average weight of 17.80 ± 0.10 kg) were allotted to the six dietary treatments in a complete randomized design. The final weight, daily weight gain, and feed conversion ratio (FCR) increased significantly with increasing CP levels. While, phytase supplementation improved (p = .044) FCR in pigs. Total solid and volatile solid content of the slurry were higher (p = .001) in pigs fed 14% and 16% CP diets supplemented with phytase when compared with other treatment groups. Concentration of methane gas emitted was lowest (p = .001) in the slurry of pigs fed 14% CP diet with or without phytase and those fed 16% CP diet with phytase supplementation. In conclusion, reduction in dietary CP levels resulted in reduced weight gain and poor FCR. While, reduced CP with phytase supplementation reduced concentration of methane gas emitted.
本试验旨在评估降低饲粮粗蛋白（CP）水平并添加或不添加植酸酶对生长猪的影响。采用 3 因素 2 水平的完全随机设计，设置 3 个 CP 水平（分别含 14%、16%和 18% CP），每个 CP 水平又分为添加和不添加 5000 FTU/g 植酸酶 2 个处理，共 6 种饲粮。将 30 头平均体重为 17.80 ± 0.10 kg 的生长猪随机分配到 6 种饲粮中。结果表明，随着 CP 水平的增加，猪的末重、日增重和饲料转化率（FCR）显著增加；而添加植酸酶则显著改善了 FCR（p = 0.044）。与其他处理组相比，添加植酸酶的 14%和 16% CP 饲粮组的粪浆总固体和挥发性固体含量更高（p = 0.001）。添加植酸酶的 14% CP 饲粮组和 16% CP 饲粮组的甲烷气体排放量最低（p = 0.001）。总之，降低饲粮 CP 水平会导致猪体重增加减少和 FCR 变差，而添加植酸酶则降低了甲烷气体的排放量。
