Study On The Energy Requirement Of Yunnan Semi-fine Wool Sheep During Empty Period And Pregnancy

In order to investigate the energy metabolism and energy requirements of the Yunnan semi-fine wool sheep during the empty period and pregnancy,this study selected 30 empty period Yunnan semi-fine wool sheep and 30 pregnant Yunnan semi-fine wool sheep.Under the energy levels of five different diets,the energy metabolism and energy requirements of Yunnan semi-fine wool sheep during the empty period and pregnancy were studied through the combination of feeding experiment,digestion and metabolism test and gas metabolism test.The effect of different dietary energy levels on the apparent digestibility of nutrients.?1?The apparent digestibility of DM and OM in the empty ewes decreased with the increase of energy level and the difference was significant?P<0.05?;Mid-pregnancy ewes,with the increase of dietary energy level,the apparent digestibility of DM increased first and then decreased,and the difference was significant?P<0.05?;There was no significant difference in apparent digestibility of DM between pre-pregnancy and late pregnancy?P>0.05?;?2?There was no significant difference in apparent digestibility of CP between empty period and pregnancy of Yunnan semi-fine wool sheep.?3?NDF digestibility was not related to energy level in pre-pregnancy and mid-pregnancy,but the difference was significant?P>0.05?.Energy level did not affect the ADF digestibility of Yunnan semi-fine wool sheep during empty period and pregnancy?P>0.05?.The effect of different dietary energy levels on production performance.The results show:?1?The energy level did not affect the initial weight,end weight,and average daily gain of the ewes during the empty period?P>0.05?;The energy level did not affect the initial weight,ending weight,and average daily gain of the ewes during pregnancy?P>0.05?;?2?There was a significant positive correlation between dry matter intake and dietary energy level of Yunnan semi-fine wool sheep during the empty period and mid-pregnancy?P<0.05?.The energy level did not affect the dry matter intake of the ewes during the late pregnancy?P<0.05?.The effect of different energy levels on energy metabolism.?1?The total energy intake of Yunnan semi-fine wool sheep during the empty period is not affected by the energy level of the diet?P=0.392?;There was a significant positive correlation between energy levels and GE,DE,ME in Yunnan semi-fine wool sheep during pregnancy?P<0.05?.?2?The energy level has no effect on the fecal energy and urine energy value of Yunnan semi-fine wool sheep during empty period and pregnancy;The energy level has a significant positive effect on the E_CH4 of the Yunnan semi-fine wool sheep during the empty period and during pregnancy.?P<0.05?;The energy level had no effect on the urinary nitrogen of Yunnan semi-fine wool sheep a during empty period and pregnancy?P>0.05?;?3?There was a significant positive correlation between GE apparent digestibility and energy level in Yunnan semi-fine wool sheep during the empty period?P<0.05?.The energy level had no significant effect on the GE apparent metabolic rate and ME apparent digestibility of Yunnan semi-fine wool sheep during the empty period?P>0.05?.The GE apparent digestibility,GE apparent metabolic rate and ME apparent digestibility of Yunnan semi-fine wool sheep during the pregnancy were significantly positively correlated with energy levels?P<0.05?.The effect of different energy levels on gas metabolism.The results show.There was a significant positive correlation between CH₄ production and energy level in Yunnan semi-fine wool sheep during the empty period and late pregnancy?P<0.05?.Dietary energy level did not affect O₂ consumption and CO₂ production in Yunnan semi-fine wool sheep during empty period,pre-pregnancy and mid-pregnancy?P>0.05?;There was a significant positive correlation between CO₂ production and energy level in Yunnan semi-fine wool sheep at the late pregnancy?P<0.05?;The dietary energy level does not affect the RQ of the Yunnan semi-fine wool sheep during empty period and pregnancy.Research on energy requirements.Through the regression analysis of experimental data,the formula for the metabolic energy of Yunnan semi-fine wool sheep during empty period and pregnancy is:Empty period:ME=372.193BW^0.75+16.263ADG?R²=0.918?Pre-pregnancy:ME=373.304BW^0.75+19.579ADG?R²=0.971?Mid-pregnancy:ME=385.711BW^0.75+20.725ADG?R²=0.952?Late pregnancy:ME=425.267 BW^0.75+26.693ADG?R²=0.952?The semi-fine wool sheep in Yunnan maintained a metabolic energy of 372.193 kJ/kgW^0.75 in the empty period,maintained a metabolic energy of 373.304 kJ/kgW^0.75in the pre-pregnancy period,maintained a metabolic energy of 385.711 kJ/kgW^0.75 in the mid-pregnancy,and maintained a metabolic energy of 425.267 kJ/kgW^0.75.In the empty period,Yunnan semi-fine wool sheep need 16263kJ per 100g daily weight gain metabolism energy,in the early-pregnancy period,Yunnan semi-fine wool sheep need19579kJ per 100g daily weight gain metabolism energy,in the mid-pregnancy,Yunnan semi-fine wool sheep need 20725kJ per 100g daily weight gain metabolism energy,in the late pregnancy,Yunnan semi-fine wool sheep need 26263kJ per 100g daily weight gain metabolism energy.According to the regression formula log?HP?=a+bMEI,the following equation can be obtained:Empty period:Log?HP?=0.0004MEI+2.4485?R²=0.6161?Pre-pregnancy:Log?HP?=0.000003 MEI+2.4493?R²=0.6918?Mid-pregnancy:Log?HP?=0.0002MEI+2.4822?R²=0.6748?Late pregnancy:Log?HP?=0.0002MEI+2.5306?R²=0.673?Yunnan semi-fine hair sheep empty period maintain a net energy NEm of 280.87 kJ/kgW^0.75,pre-pregnancy maintenance net energy NEm is 281.38kJ/kgW^0.75,mid-pregnancy maintenance net energy NEm is 303.53 kJ/kgW^0.75,maintain the net in late pregnancy The NEm is 339.31kJ/kgW^0.75.The maintenance efficiency of Yunnan semi-fine wool sheep was 0.755,and the maintenance efficiencies,pre-pregnancy mid-pregnancy,and late pregnancy were 0.754,0.787,and 0.798,respectively.