The Use Of Expanded Rapeseed, Brewer's Grains (Dried) In Duck Diet And Determination Of Metabolizable Energy, Available Amino Acid

Three experiments were conducted to determine apparent energy digestibility, apparent metabolizable energy (AME), apparent amino acid digestibility and true amino acid digestibility of expanded rapeseed and brewer's grains (dried), to study the effects of expanded rapeseed and brewers dried grain on duck performance and economic benefits.Exp.l was carried out with 24 crossbred (YingtaoguxJianchang) drakes to determinate AME, apparent amino acid digestibility and true amino acid digestibility of expanded rapeseed and brewer's grains (dried). Basic diet was substituted by expanded rapeseed and brewer's grains (dried), 20 % , 30 % respectively.AME, apparent amino acid digestibility, true amino acid digestibility of expanded rapeseed and brewer's grains (dried) were calculated by substitute method. The total of endogenous amino acid of every drake degroupined by NFD method were 342.36mg /d. The apparent digestibility of expanded rapeseed and brewer's grains (dried) were 65.17% and 50.68%, AME were 3.9765 Mcal/kgDM, 2.4076 Mcal/kgDM respectively. The average of apparent amino acid digestibility were 71.61% and 73.60% respectively, of true amino acid digestibility of expanded rapeseed and brewer's grains (dried) determinated by the NFD method were as fellows: 73.55% and 78.46%, respectively.Exp.2, Expanded rapeseed was used as a substitute for part of soybean meals (SBM) in order to study its effect on duck performance and economic benefits. This trial was Single-factor design.108 one-day-old crossbred (YingtaoguxJiancang) drakes, their average body weight (BW) was 54.54?.09g, were randomly allotted to 18 team and six drakes per team. Expanded rapeseeds were used instead of part of SBM in a same nitrogen level, and add synthesized Lys, Met until they were correspond to SBM group. Expanded rapeseed in ration is 0 ,7 % ,11 % from 1 to 2 week, and 0 ,11%,15% from 3 to 4 week. The experiment lasted 28 days. The results indicated that, daily feed intake was significant (p<0.05) between 7% expanded rapeseed group and SBM group, and significant (p<0.01) between 11% expanded rapeseed group and SBM group; daily gain was significant (p<0.05) between experiment group and SBM group; feed/gain was significant (p<0.01) between 11% expanded rapeseed group and 7% expanded rapeseed, between 11% expanded rapeseed group and SBM group too, from 1 to 2 week . And daily feed39intake , daily gain and feed/gain were not significant (p>0.05) between expanded rapeseed group and SBM group.The cost of feed per kilogram gain decrease?.07 in the group supplementation with 7% expanded rapeseed, and Y0.24 in the group supplementation with 11% expanded rapeseed from 1 to 2 week. The cost of feed per kilogram gain decrease Y0.01 in the group supplementation with 11% expanded rapeseed,and ?.16 in the group supplementation with 15% expanded rapeseed from 3 to 4 week.Exp.3 Brewers dried grain was substituted for part of soybean meals(SBM) to study the effect of brewers dried grain on duck performance and economic benefits. This was Single-factor design. 72 crossbred (YingtaoguxJianchang) drakes that an BW was 618.13?.61g were randomly allotted to 12 team and six drakes per team at 15-d age. Brewer's grain (dried) was substituted for part of SBM in a same nitrogen level, and add synthesized Lys, Met until it was correspond to SBM group. The proportion of brewer's grain (dried) was 20%. The experiment lasted 14 days. The result indicated that there was no significant (p>0.05) in daily feed intake, daily gain, feed/gain between control group and experimental group in the entire period. Compared to the control group, the cost of feed per kilogram gain decrease Y0.14 in the experimental group.