Effects Of Supplementation Of Enzyme Complex On Performance And Digestive Tract Development Of Laying Hens And Broilers

The aim of the present trail is to calculate the potential nutritive value of crude protein (CP) and energy (ME) adding enzyme complex in corn-soybean meal based diets, common diets and miscellaneous diets of laying hens, and to determine the effects of different doses enzyme on performance, nutrient availability, blood parameter, relative weight, length, amylase and trypsin activity of digestive organs and gut morphology in broilers.Experiment one Three metabolism experiments,each lasted 20 d, were conducted in this study. The first 14 d was transition period, the following 6 d was experiment period. Sixty heads of 270 d old Lomman laying hens were randomly allocated to 4 groups with each group including 5 replicates and 3 birds per replicate. Four diets were offered: the control and 120 g/t, 150 g/t and 180 g/t Yiduoli enzyme complex added in the control.The results showed that apparent metabolizability of CP and ME were not affected in corn-soybean meal based diets (P>0.05). As to common diets, apparent metabolizability of CP in the enzyme treatment groups extremely significantly (P<0.01) increased by 20.82%, 22.32% and 19.51%, respectively, apparent metabolizability of energy in groups 120 g/t and 180 g/t enzyme increased by 6.22% (P<0.01) and 4.72% (P<0.05). The potential nutritive value of 120 g/t enzyme complex in common diets: 1 kg enzyme was equivalent to 124.52 kg digestible crude protein and 4.36 MJ/kg metabolisable energy. As to miscellaneous diets, groups 150 g/t and 180 g/t enzyme were higher than the control in apparent metabolizability of CP and ME (P<0.05). The potential nutritive value of 150 g/t enzyme complex in miscellaneous diets: 1 kg enzyme was equivalent to 39.58 kg digestible crude protein and 2.22 MJ/kg metabolisable energy.Experiment two Three hundred and eighty four heads of 21 d old Avain broilers were randomly allocated to 4 groups with each group including 6 replicates and 16 birds per replicate. Four diets were offered: the control was the based diet and 180 g/t, 360 g/t and 720 g/t Yiduoli enzyme complex added in the control. The experiment lasted 4 weeks. The results showed that 180 g/t and 360 g/t enzyme treatments significantly improved body weight(BW), average daily gain(ADG) and feed meat ratio (FMR) of broilers...