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酶解法与尼龙袋法评定处理豆粕瘤胃保护效果的比较研究

Estimate the Protecting Effect of Processed Soybean Meal in the Enzymatic Technique and in Situ

【作者】 国春艳;

【导师】 刁其玉; 杨开伦; 许宗运;

【作者基本信息】 新疆农业大学 , 动物营养与饲料科学, 2006, 硕士

【摘要】 本论文研究了多羟基酮浓度在不同加热温度和时间下,对豆粕瘤胃保护效果的影响。试验中采用单一酶解法和两步酶解法对试验中对不同处理豆粕的干物质和粗蛋白质降解率进行评定。在建立酶解法操作程序的同时,采用酶解法和尼龙袋法相结合的方法,对豆粕的过瘤胃效果进行评定,筛选出最适的多羟基酮浓度及其加热温度和时间的组分。试验一建立评定处理豆粕蛋白质降解率的酶解法操作程序在Tilly和Terry(1963)提出的酶解法基础上,优化了胃蛋白酶—胰蛋白酶两步法评定保护蛋白质的体外消化的最适条件。建立的单一胃蛋白酶降解处理豆粕的主要参数是:温度为40℃,底物的量为0.5g,水浴培养时间为24h,缓冲液pH为1.55,酶量为120IU/30ml。优化后的胃蛋白酶—胰蛋白酶两步酶解法,降解处理豆粕的操作程序的特点是:按单一胃蛋白酶解法操作程序,水浴培养6h后,调节消化液的pH至7.8,添加5ml含160mg胰蛋白酶溶液,在39℃继续培养18h。试验二豆粕的保护处理方法及其过瘤胃效果的快速评定本试验中豆粕的瘤胃保护处理方法为添加多羟基酮和加热处理的复合处理法。多羟基酮的添加浓度分别为0%,0.5%,1%,3%,5%;加热温度分别为60℃,80℃,90℃,120℃,150℃;加热时间分别为30min,60min,90min,120min,采用完全设计,共100个处理。用单一胃蛋白酶法评定不同保护处理的豆粕的干物质和粗蛋白质降解率。通过各处理豆粕降解后干物质的消失率和粗蛋白质的降解率之间的差异,筛选出31个粗蛋白质未降解率高于30%的处理组,其中部分处理组未降解率为66%左右。试验三用两步酶解法对处理豆粕保护效果的评定用试验一建立的胃蛋白酶—胰蛋白酶两步酶解法对试验二筛选出的31个处理组样品进行体外消化,分别以未处理豆粕为负对照组,商业保护豆粕为正对照组。两步酶解法和单一酶解法评定不同处理样品的粗蛋白质降解率,结果有较强的相关性,建立的回归方程为Y=-0.34+13.30X,相关系数(r)=0.92466;然而,这两种方法评定不同处理样品的干物质消失率时,结果的相关性较弱,建立的回归方程为Y=7.13+2.81X,相关系数(r)=0.45585。试验四用尼龙袋法对处理豆粕保护效果的评定用尼龙袋法测定试验三中经两步酶解法体外消化的33个处理豆粕处理样品的粗蛋白质瘤胃降解率和干物质消失率。将各处理组的结果与试验三两步酶解法体外消化结果比较,两步酶解法与尼龙袋法干物质消失率间的相关系数(r)=0.45568(P=0.0077),线性回归方程为Y=-2.00+2.81X;粗

【Abstract】 The effect of using various heating periods, temperatures and the concentration ofMonosaccharidetoprocesssoybeanmeal,whichinordertodecreasethedegradationofcrudeprotein in rumen had evaluated. both dry matter an crude protein dergraduation of different soybeanmeals have been appraised by single pepsine and two steps pepsine-trypsin procedure.Moreover,thisitemusenylontechnicalaccessthefiltratedgroupsatthesametime,toaccountthe correlativity between enzyme procedure and nylon technical,inoder to filter out the mostproperconcertrationofMonosaccharideandaccordingheatingtempetatureandperiodgroup.Exp1Establish the procedure of using enzyme procedure to evaluate the degradation oftheSoybeanMealOn the basis of Tilly and Terry(1963),some improvements have been made to meet theoptimum conditionofenzymic procedure .The pepsineprocedure as follows: adjust thepH ofbuffer solution to 1.55. , then add 120IU pepsine to 0.5g Soybean Meal, then add 1ml 0.25%chloramphenicol solution,then incubate 24 hours at 40℃in water shaking,then filtrate thesolution and dry the residue at 65℃,after 24 hours weight the redue and account them. Thepepsine-trypsin procedure as follows:see also the pepsine procedure ,only incubate 6houresafter add pepsine solution,then adjust the buffer solution pH to 7.8 by NaOH,then adding160mgtrypsincontinulincubate18hours.Exp 2 The processing method of the degradation of the soybean meal and its quickevaluationAdding monosaccharide and thermal treatment had been adopted as an compositeprocess.And the concentration of monosaccharide is 0%,0.5%,1%,3%,5% respectively,the

  • 【分类号】S816
  • 【被引频次】14
  • 【下载频次】444
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