The Effects Of Rumen Protected Amino Acids Added In Complex Chemical Straw Diet On Production Performance And Meat Quality Of Tan Sheep

The research through feeding experiment,digestion and metabolism trial and slaughter experiment,to study the complex chemical treatment straw was added in the diet with rumen protected methionine(RPMet)and rumen protected lysine(RPLys)for growth performance,blood biochemical indexes,digestion and metabolism indexes and meat quality of tan sheep,so as to screen out the best RPMet and RPLys content for tan sheep.This research focuses on the following;Chapter]:The effects of RPMet on production performance and meat quality of tan sheepExperiment 1:Effects of RPMet on the growth performance and blood biochemical index of tan sheep.Twenty four-month old healthy tan sheep were divided into 5 groups,4 tan sheep in each group randomly.Namely control group(basic diet),treatment 1(basic diet+1.5g RPMet),treatment 2(basic diet+3.0g RPMet),treatment 3(basic diet+4.5g RPMet),treatment 4(basic diet+6.0g RPMet).The results showed that:Adding RPMet in the diet could increase the total gain and daily gain of tan sheep(P>0.05),with addition amount was 4.5 g/d,the weight gain and economic benefit of tan sheep were higher than other groups,at the same time,it can increase the total protein content and blood sugar content of tan sheep serum and decrease the content of urea nitrogen significantly(P<0.05).Experiment 2:Effects of RPMet on the digestion and metabolism performance of tan sheep.Adding RPMet in the diet could improve the nutrients digestibility significantly(P<0.05),and promote the nitrogen metabolism and energy metabolism of tan sheep.The digestibility of NDF and ADF were higher than the control group significantly when the addition amount was 4.5 g/d.(P<0.05).Experiment 3:Effects of RPMet on the slaughter performance and meat quality of tan sheep.Adding RPMet in the diet could increase meat percentage,cooked meat rate and muscle crude protein content of tan sheep significantly(P<0.05),with the addition amount in 4.5g/d was the best.Chapter 2:The effects of RPMet on production performance and meat quality of tan sheepExperiment 1:Effects of RPMet and RPLys on the growth performance and blood biochemical index of tan sheep.Twenty healthy tan sheep were randomly divided into 5 groups with 4 in each group.Namely control group(4.5 g/dRPMet),treatment 1(4.5g RPMet+2.5g RPLys),treatment 2(4.5g RPMet+5.0g RPLys),treatment 3(4.5g RPMet+7.5g RPLys),treatment 4(4.5g RPMet+10.0g RPLys).The results showed that:The serum urea nitrogen of tan sheep in control group was significantly lower than other groups(P<0.05),The dry matter intake,total gain and daily weight gain of control group were significantly higher than other groups(P<0.05),and economic benefit of control group was the highest in all groups.Experiment 2:Effects of RPMet and RPLys on the digestion and metabolism performance of tan sheep.The digestibility of neutral detergent fiber and ADF and NDF of control group were higher than treatment groups(P<0.05),and there was no significant difference in energy metabolism(P>0.05).Experiment 3:Effects of RPMet and RPLys on the slaughter performance and meat quality of tan sheep.There were no significant differences in slaughter performance,meat physical and chemical indexes and nutritional composition of all groups(P>0.05),but with the increase of RPLys addition level,the cooked meat rate of mutton was presented a declining trend.Based on the above test results,combined with the growth performance,blood biochemical indexes,digestion and metabolism performance and meat quality of the tan sheep,under the conditions of complex chemical treatment straw diet,the optimal amount of RPMet was 4.5g/d,and the optimal amount of RPLys was 0 g/d.