Effect Of Ammoniation Conditions On Rice Straw And The Effect Of Ammoniated Rice Straw On Lamb

There were 5 trials in this study. Suitable ammoniating time was determined in the first trialby measuring the nutritive value of rice straw ammoniated with 30％, 50％, 70％water contents andwithout additional water. In the third trial, 4 sheep with rumen fistulas were selected to study thedegradation ration of DM, ADF, NDF after the samples of rice straw unammoniated andammoniated with different water contents had been put into rumen for 72 hours.In the second, thefourth and the fifth trials, 12 Texel×local breeds ablactated lambs, 12 Poll Dorset~ local breedlamb, 12 Suffolk×breed lambs were selected to study the intake of ammoniation rice straw and theeffect on their performance.In trial 1, the rice straw with 30％, 50％,70％water contents and rice straw without additionalwater were ammoniated for 1,2,3,4 weeks under the temperature of 20-25℃.The contents of CP inthe rice straw with ammoniated for 4weeks were significantly higher than that of theunammoniated, and ADF and NDF were significantly lower. The contents of CP, ADF and NDFwere also changed with the increase of water content, but the change was not significant whenwater content was more than 50％.In trial 2, the intake of the ammoniated and the unammoniated straw were observed. The resultshowed that the intake of the ammoniated straw was significant more than that of theunammoniated, the intake of the ammoniated rice straw without additional water content and with30％, 50％, 70％water contents were increased by 17.59％, 22.48％, 23.9％and 28.4％. The threecross-breed did not show any significant difference in the intake of ammoniated rice straw.In trial 3, the degestion of DM, ADF and NDF in rumen less than 72 hours using nylonpacket was measured. The results showed that DMD_W, ADFD_W, NDFD_W with different time weresignificantly different. DMD_W, ADFD_W and NDFD_W became higher when the degesting timebecame longer. DMD_W, ADFD_W and NDFD_W of the ammoniated rice straw without additionalwater content and with 30％, 50％and 70％water contents were higher than that of theunammoniated rice straw. DMD_w, ADFD_W and NDFD_W became higher when the water becamemore.In trial 4, the results showed that the performance of different cross-breed lambs was notsignificantly different. Diet with the rice straw ammoniated with 70％water content gave thehighest average daily gain among the treatments. Diet with the rice straw ammoniated with 50％water content and 30％water content showed no significant difference. The feed conversion ratioand the cost of diet with the rice straw ammoniated with different water contents did not showsignificant difference.In trial 5, the apparent degestibility was tested by sampling all feces. The results showed thatbreed had no significant effect on the apparent degestibility of DMD, CPD, ADFD and NDFD.TheDMD of the diet with the straw ammoniated without the additional water was significant lowerthan other diet. The CPD of diet with the rice straw ammoniated with 30％water content andwithout additional water were significantly lower than other diet. The ADFD and NDFD of dietwith the rice straw ammoniated with 70％water content was significant higher than other diet.