Difference In Different Growth Stages Of Simmental Hybrid Beef Cattle Emission N、p And Methane

Manure and harmful gas emissions is one of the main causes of environmental pollution. The trial is on the basis of referencing to the relevant literature of domestic and foreign, from the perspective of theory,take hybrid Simmental beef cattle as the research object, through the relevant experiment, Systematically studied the pollutant emissions of hybrid Simmental beef cattle the system studies the pollutant emissions,to effectively control the emission of livestock pollutants, manure resources treatment and disposal and provided the basis for resource utilization.There are two trials in this study. It studied the different methane,nitrogen and phosphorus emissions of different growth stages of hybrid Simmental beef cattle. And compared the emission load of methane,nitrogen and phosphorus per unit of body weight of hybrid Simmental beef cattle. A total of six experimental cattle, divided into three phases:A phase, live weight400kg±30kg; B stage, live weight500kg±30kg; C phase, live weight600kg±30kg.Exp.1The trial compared the emission load of methane,nitrogen and phosphorus per unit of body weigh, per unit of gain body weight and per unit of feed intake. The experimental cattle are divided into three phases. Every phase has two experimental cattle of similar live weight. The trial lasted35days. We weighted the body weight of the experimental cattle before the trail began. The pre-trail period was from1st to30th day, ane the sampling period was from31st to35th. We measured feed intake of the experimental cattle and collect all dung ane all urine of the experimental cattle during sampling period to analysis the different methane.nitrogen and phosphorus emissions of different growth stages of hybrid Simmental beef cattle. We weight the body weight again after the trial and calculated daily weight gain of the experimental cattle during the trail. The experimental results showed that:1、The nitrogen intake was gradually rising of the different three growth stages and A stage showed significant difference compared with B stage and C stage. B stage and C stage had no significant difference(P>0.05); Fecal nitrogen emissions showed rising trend of different physiological stages, and A stage compared with B stage showed no significant difference. B stage compared with C stage showed no significant difference. A stage compared with C stage showed significant difference. B stage compared with C stage showed no significant difference (P>0.05),on the whole, showed a trend of rise. Three stages of beef cattle nitrogen deposition was not significant difference (P>0.05), the rate of nitrogen retention present a rising trend; the apparent digestibility of nitrogen had no significant difference among the three stages (P>0.05) and B>A>C. 2、There were no significant difference among the there stages on phosphorus retention, the apparent digestibility of phosphorus and the ratio of phosphorus in feces and phosphorus intake (P>0.05). The phosphorus retention showed a gradually increasing trend. The apparent digestibility of phosphorus was A>C>B. The ratio of phosphorus in feces and phosphorus intake was B>C>A. The phosphorus intake present a rising trend. A stage compared with B stage and C stage had significant difference. B stage compared with C stage had no significant difference (P>0.05); The phosphorus emission in feces is B>C>A. A stage compared with B stage has significant difference. C stage compared with B stage and A stage had no significant difference (P>0.05).Exp.2Using SF6tracer method to measure the methane emission of different growth stages of hybrid Simmental beef cattle, and calculated per unit weight of methane emissions of the experimental cattle. Trial2started at the same time with the trial1. During the sampling period using prepared oxbow to collect the cattle exhalant gas.Results of the trial indicated that:With the increasing of weight methane emissions present rising trend. A stage compared with B stage and C stage has significant difference. B stage compared with C stage has no significant difference (P>0.05). From the view of per unit weight: With the increasing of live weight the methane emissions of per unit weight shows a decreasing trend. The statistical analysis results show that the three groups of different stages of beef cattle has no significant different methane emissions per unit live weight.