| This experiment mainly discusses different protease is added in the low protein diet on pig growth performance and the influence of the apparent digestibility of nutrients. This experiment choose 150 healthy long x large binary hybrid pig and the average weight of 79 ±8.71 kg. Were randomly divided into control group of positive 、 negative control group 、 experimental group 1 、 experiment group 2,and three sets of a total of five, each processing 30 repeated, respectively on three feeding bar, each column 10 pigs. Is the control feeding conventional protein diet; Negative contrast fed low protein diet 1% reduction on the normal protein diet. A group test, experiment group 2, three groups, respectively, in the low protein diet add protease A(enzyme25000 u/g)10 g/t, protease B(enzyme8000 u/g)200 g/t, protease C(enzyme40000 u/g) 150 g/t of protease. Growth performance test period for 30 d, Pig’s weight and daily feed intake by osborne determination system is complete.Growth performance test results show that the experiment at the end of each group of pigs weight difference was not significant(p > 0.05). From the daily gain, in a test group and three groups of no significant difference compared with the daily gain was the control group(p > 0.05), daily gain and test group and positive control group decreased by 14%, compared with the test of a set of daily gain、 three groups decreased by 12.8%、12.8%, compared to the significant difference(p < 0.05). Test a group、 two groups、 three groups of materials is lower than in lower protein on the basis of no significant difference compared with the control group(p > 0.05).Nutrient apparent digestibility results show that the test of two groups of crude protein digestibility compared with group A significant difference(p < 0.05), the test groups 、 three groups and the control way is reduced, but no significant difference(p > 0.05). A group test、 experiment group 2,、three groups of crude ash, crude fiber, calcium, phosphorus, and the apparent digestibility of dry matter compared with negative control group no significant difference(p > 0.05). Each group crude fat is not significant difference compared with control group(p > 0.05). The test of a set of dry matter of crude ash、 crude fiber、 calcium,no significant difference compared with positive control group(p > 0.05), phosphorus digestibility and the control group significant difference(p < 0.05). Experiment 2 groups of crude ash、 crude fiber、 calcium、phosphorus, the apparent digestibility of dry matter significant difference compared with positive control group(p < 0.05). Test three sets of apparent digestibility of crude fiber compared with positive control group difference was not significant(p > 0.05). Apparent digestibility of amino acids showed that the enzymatic and are compared according to the group, significantly lower than the control group, each group of glycine 、 tyrosine 、 phenylalanine 、 lysine, no significant difference compared with control group(P > 0.05), experiment group、 three way arginine apparent digestibility and test the significant difference was found in two groups(P < 0.05), test a group of proline apparent digestibility and test 2 group,、3 group significant difference(P < 0.05), experiment group, two groups, test three sets of glutamic acid、 serine、 proline、 valine、 methionine、 leucine, apparent digestibility compared with negative control group no significant difference(P > 0.05), test three sets of cystine apparent digestibility and test a set of significant difference(P < 0.05), and test two way no significant difference(P > 0.05), and is a significant difference was found in control group(P < 0.05).Test results show that under this experimental condition, protein one percent reduction will not affect the pig growth performance. In the pig 80 kg— 110 kg, at this stage was added in the diet with low protein protease can improve growth performance, can improve the apparent digestibility of nutrients. |
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