Mahmood T, Mirza M A, Nawaz H, Shahid M
Institute of Animal Sciences, University of Agriculture, Faisalabad, Pakistan.
Department of Biochemistry, University of Agriculture, Faisalabad, Pakistan.
J Anim Physiol Anim Nutr (Berl). 2018 Feb;102(1):e233-e241. doi: 10.1111/jpn.12734. Epub 2017 Apr 28.
An experiment was conducted to investigate the effects of three levels (0%, 3% and 6%) of poultry by-product meal (PBM) with or without protease on broiler growth, carcass characteristics and nutrient digestibility from 1 to 35 days. Two hundred and forty birds (n = 240) were fed equi-caloric and equi-nitrogenous (ME 2850 kcal/kg; CP 20%) diets throughout the experiment. The enzyme supplementation increased feed intake (p < .01) and body weight gain (p < .01), but feed:gain remained unaffected (p > .05) from 1 to 21 days. Increasing level of PBM decreased feed intake (p < .05), but body weight gain was improved (p < .05) at 3% PBM level during 1 to 21 days. The feed:gain was improved (p < .05) in birds fed diets containing 3% PBM. The feed:gain was also improved in birds fed diets containing 3% PBM from 1 to 35 days. However, feed intake and body weight gain in birds fed diets containing PBM remained unaffected. An interaction (p < .01) on feed intake between enzyme and PBM was noticed during 1 to 21 days. However, no interaction was recorded for body weight gain and feed:gain. The per cent carcass yield improved (p < .01) in birds fed diets supplemented with enzyme. The per cent breast meat yield was depressed (p < .005) in birds fed diets containing PBM. Apparent metabolizable energy (p < .001), nitrogen retention (p < .01), apparent metabolizable energy corrected for nitrogen (p < .001), and apparent digestibility coefficient for nitrogen (p < .01) improved in birds fed diets containing enzyme; however, a reverse was noticed in those fed diets containing only PBM. In conclusion, inclusion of 3% PBM along with supplementation of exogenous protease improved performance and nutrient digestibility in broilers.
进行了一项实验，以研究添加或不添加蛋白酶的三种水平（0%、3%和6%）的家禽副产品粉（PBM）对1至35日龄肉鸡生长性能、胴体特性和养分消化率的影响。在整个实验过程中，给240只鸡（n = 240）饲喂等热量和等氮量（代谢能2850千卡/千克；粗蛋白20%）的日粮。添加酶提高了采食量（p < 0.01）和体重增加（p < 0.01），但在1至21日龄期间，料重比未受影响（p > 0.05）。在1至21日龄期间，增加PBM水平会降低采食量（p < 0.05），但在3% PBM水平时体重增加得到改善（p < 0.05）。饲喂含3% PBM日粮的鸡的料重比得到改善（p < 0.05）。在1至35日龄期间，饲喂含3% PBM日粮的鸡的料重比也得到改善。然而，饲喂含PBM日粮的鸡的采食量和体重增加未受影响。在1至21日龄期间，观察到酶和PBM之间对采食量有交互作用（p < 0.01）。然而，体重增加和料重比未记录到交互作用。添加酶的日粮组鸡的胴体产率百分比提高（p < 0.01）。饲喂含PBM日粮的鸡的胸肉产率百分比降低（p < 0.005）。饲喂含酶日粮的鸡的表观代谢能（p < 0.001）、氮保留率（p < 0.01）、氮校正表观代谢能（p < 0.001）和氮表观消化率系数（p < 0.01）均有所提高；然而，仅饲喂含PBM日粮的鸡则出现相反情况。总之，添加3% PBM并补充外源蛋白酶可提高肉鸡的生产性能和养分消化率。
