Effect Of Concentrate Energy Levels On Performance And Apparent Digestibility Of Nutrients In One Year Old Yaks By Barn-feeding

In this study, the design of three different concentrate energy levels were conducted to investigate the effect of production performance, blood biochemical parameters and apparent digestibility of nutrients in one year old yaks by barn-feeding. The first part is the effect of concentrate energy levels on production performance, blood biochemical parameters. On the basis of previous trials, we used total feces collection method to explore the effect of concentrate energy levels on apparent digestibility of nutrients in yaks by barn-feeding.Test1Effect of concentrate energy levels on production performance and blood biochemical parameters in one year old yaks by barn-feeding.The experiment in accordance with the randomized design selected24healthy in good body condition similar body weight (65.16±8.30kg) one year old yaks as test animals, the yaks were fed in pen.The experiment is divided into3groups (n=8),2yaks a duplicate, Three treatments concentrate Neg levels were5.50MJ/Kg,6.20MJ/Kg,6.90MJ/Kg, Similar protein levels(CP:15%)and forage was oat hay.The test was pre-feeding period15d, the formal period45d. The test results showed that:1) one year old yaks were farmed in sheds conditions, three tearment groups compared to the initial werght of yak were increased by10.71%,15.97%,18.49%;2) the average daily gain of the middle-energy group and the high-energy group were significantly higher than the low-energy group(P<0.05), but the middle-energy group between the high-energy group difference were not significant(P>0.05), improving the concentrate energy levels significantly increase the one year old yaks average daily gain and feed reward;3) the middle-energy group and the high-energy group serum GLU, TG and ALP were significantly higher than the low-energy group(P<0.05), but the middle-energy group between the high-energy group difference was not significant(P>0.05), improving concentrate energy level was helpful for improving glucose and lipid metabolism about yaks by barn-feeding.Test2Effect of concentrate energy levels on apparent digestibility of nutrients in one year old yaks by barn-feeding.Test on first test basis, each repeat selected one yak. This test was pre-feeding period 15d, the formal period of7d digestion trials, at the fifth day of testing began to collect the feces, continuously for3days. During the test each treatment group continued to be fed corresponding to low, medium and high energy level of precision feeding. The results showed that:the middle-energy group DM, OM total tract apparent digestibility was significantly higher than the low-energy group and the high-energy group (P<0.05)In summary, one year old yaks were farmed through concentrate and forage feeding in sheds conditions. The concentrate NEg=6.20MJ/Kg can significantly increase one year old yak on feed DM, OM digestibility, improving yaks’ body glucose and lipid metabolism, significantly improving daily gain and feed efficiency of yaks, promoting the body’s growth and development.