Effect Of Organic Acid Ratio And Adding Levels On Performance, Faeces, Urine And Methane Emissions Of Shanbei White Cashmere Goats

The feeding trials, digestion and metabolism test, blood collection and measurement ofmethane emissions were conducted to study the effect of organic acid ratio on performance,faeces, urine and methane emissions of Shanbei white cashmere goats. Then the experimentwas implemented to study the effect of organic acid adding levels on performance, faeces,urine and methane emissions of Shanbei white cashmere goats according to the selectedoptimum ratio to provide theoretical basis for healthy and ecological farming of Shanbeiwhite cashmere goats.Experiment1. Effect of organic acid ratio on performance,faeces,urine and methane emissionsof Shanbei white cashmere goatsThirty-six Shanbei white cashmere goats aged one-year-old during non-pregnancy wererandomly divided four treatment groups which were group A(control group), group B,group C and group D respestively, three replicates per group, three goats per replicate. GroupA was fed basal diet, the malic acid and fumaric acid of1:3,1:1and3:1were added to thebasal diet to form the experimental diets of three experimental groups with one percent addinglevels. The feeding trial lasted for37d, then a seven-day digestive metabolism test andmeasurement of methane emissions were conducted on20th day of feeding trial. Eachreplicate was selected one goat to collect the jugular venous blood on the morning of first dayafter feeding trials. The results showed that:(1) Four treatment groups had significant differences for performance, nutrient apparentdigestibility, metabolic rate of gross energy and economic benefits（P<0.05）. Threeexperimental groups had improved all indicators compared with the control group withvarying degrees and all indicators of group C were the highest.(2) Four treatment groups had no significant differences for faeces, urine, faeces andurine emissions per weight gain（P＞0.05）, but had significant differences for methaneemissions per weight gain（P<0.05）. Three experimental groups had decreased all indicatorscompared with the control group with varying degrees and group C were the lowest. (3) Four treatment groups had no significant differences for total protein, urea nitrogen,blood glucose and triglycerides in serum（P＞0.05）, but had significant differences forLactate dehydrogenase in serum（P<0.05）. Three experimental groups had increased itcompared with the control group with varying degrees and group C were the highest.Experiment2. Effect of organic acid adding levels on performance,faeces,urine and methaneemissions of Shanbei white cashmere goatsThirty-six Shanbei white cashmere goats aged one-year-old during non-pregnancy wererandomly divided four treatment groups which were group A(control group), group B,group C and group D respestively, three replicates per group, three goats per replicate. GroupA was fed basal diet, and three experimental groups were fed experimental diets containing0.80%,1.60%and2.40%composite organic acid(50%malic acid and50%fumaric acid)respectively. The feeding trial lasted for37d, then a seven-day digestive metabolism test andmethane emissions measurement test were conducted on20th day of feeding trial. Eachreplicate was selected one goat to collect the jugular venous blood on the morning of first dayafter feeding trials. The results showed that:(1) Four treatment groups had significant differences for performance except DMI（P<0.05）. Three experimental groups had improved all indicators compared with the controlgroup with varying degrees.(2) Four treatment groups had no significant differences for digestibility of DM, CP, CFand metabolic rate of energy（P＞0.05）, but had significant differences for digestibility ofGE,ADF and NDF（P<0.05）. Three experimental groups had increased all indicatorscompared with control group with varying degrees and group C were the highest.(3) Four treatment groups had no significant differences for total protein, urea nitrogen,blood glucose and triglycerides in serum（P＞0.05）, but had significant differences forLactate dehydrogenase in serum（P<0.05）. Three experimental groups had increased itcompared with control group with varying degrees and group D were the highest.(4) Four treatment groups had significant differences for methane, faeces and urineemissions per weight gain（P<0.05）. Three experimental groups had decreased all indicatorscompared with the control group with varying degrees.(5) Four treatment groups had significant differences for economic benefits（P<0.05）.Three experimental groups had increased all indicators compared with the control group withvarying degrees and all indicators of group B were the highest.