作　　者： (张成喜）; (刘吉山）; (孙国强）;

机构地区： 青岛农业大学动物科技学院,山东青岛266109

出　　处： 《中国饲料》 2017年第16期20-23,共4页

摘　　要： 为研究过瘤胃蛋氨酸(RPMet)对奶牛血液生化指标和养分消化率的影响。本试验选取年龄、体重、胎次、产奶量、乳成分及泌乳期(90±15)d相近的荷斯坦奶牛40头,随机分为4组,每组10头。对照组和试验1组、2组、3组日粮中分别添加0、15、25、35 g/(d·头)过瘤胃蛋氨酸。预试期15 d,正式期60 d。结果表明:(1)在血液生化指标方面,过瘤胃蛋氨酸能够显著提高血清中总蛋白质和生长激素的含量(P<0.05),其中试验1组、2组、3组的总蛋白质含量分别比对照组提高2.79%、7.35%、5.28%,生长激素含量分别比对照组提高11.78%、17.81%、13.69%;能够极显著降低血清中尿素氮的含量(P<0.01),试验1组、2组、3组的尿素氮含量分别比对照组降低9.18%、13.50%、11.37%。(2)在养分表观消化率方面,过瘤胃蛋氨酸能显著提高干物质和粗蛋白质的表观消化率(P<0.05),极显著提高中性洗涤纤维和酸性洗涤纤维的表观消化率(P<0.01),其中试验1组、2组、3组的干物质表观消化率分别比对照组提高4.10%、7.81%、6.57%,粗蛋白质表观消化率分别比对照组提高2.71%、6.60%、5.24%,中性洗涤纤维表观消化率分别比对照组提高7.59%、15.37%、10.68%,酸性洗涤纤维表观消化率分别比对照组提高8.29%、16.61%、12.35%。在本试验条件下,综合考虑血液生化指标和养分表观消化率,奶牛日粮中过瘤胃蛋氨酸的最适添加量为25 g/(d·头)。 This experiment was conducted to determine the effect of rumen-protected methionine（RPMet） on blood biochemical parameter and nutrient digestibility of dairy cows.A total of 40 Holstein cows with similar age,body weight,parity,milk yield,milk composition and lactation stage（90±15 days in milk） were divided into 4 groups with 10 cows per group.The supplement levels of rumen-protected methionine in control and test groups 1,2 and 3 were 0,15,25,35 g/（d·head）,respectively.The pretest lasted for 15 days,and the test lasted for 60 days.The results showed as follows：（1） In terms of blood biochemical parameter,compared with the control group the total protein（TP） in test groups 1,2,3 were significantly increased by 2.79%,7.35%,5.28%（P〈0.05）,growth hormone（GH） in test groups 1,2,3 were significantly increased by 11.78%,17.81%,13.69%（P〈0.05）;blood urea nitrogen（BUN） in test groups 1,2,3 were significantly reduced by 9.18%,13.50%,11.37%（P〈0.01）.（2） In terms of apparent nutrient digestibility,compared with the control group the apparent digestibility of dry matter（DM） in test groups 1,2,3 were significantly increased by 4.10%,7.81%,6.57%（P〈0.05）;the apparent digestibility of crude protein（CP） in test groups 1,2,3 were significantly increased by2.71%,6.60%,5.24%（P〈0.05）;the apparent digestibility of neutral detergent fiber（NDF） in test groups 1,2,3 were significantly increased by 7.59%,15.37%,10.68%（P〈0.01）;the apparent digestibility of acid detergent fiber（ADF） in test groups 1,2,3 were significantly increased by 8.29%,16.61%,12.35%（P〈0.01）.Based on the data of blood biochemical parameter and nutrient apparent digestibility,it concluded that the suitable supplement level of rumen-protected methionine was 25 g/（d·head） in the diet of dairy cows under the condition in the present study.

关 键 词： 过瘤胃蛋氨酸 血液生化指标 养分消化率