过瘤胃蛋氨酸对奶牛血液生化指标和养分消化率的影响

发布时间：2018-12-05 21:21

【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(P0.05),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(P0.01),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(P0.05),极显著提高中性洗涤纤维和酸性洗涤纤维的表观消化率(P0.01),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)。
[Abstract]:To study the effect of rumen methionine (RPMet) on blood biochemical indexes and nutrient digestibility of dairy cows. In this study, 40 Holstein cows with age, body weight, birth order, milk yield, milk composition and lactation period (90 卤15) days were randomly divided into 4 groups with 10 cows in each group. The diets of control group, trial group 1, group 2 and group 3 were supplemented with methionine in rumen. The pre-test period was 15 days and the formal period was 60 days. The results showed that: (1) in blood biochemical indexes, rumen methionine could significantly increase the contents of serum total protein and growth hormone (P0.05). Compared with the control group, the total protein content of the 3 groups was increased by 2.79% and 7.35% and 5.28%, respectively, and the growth hormone content was increased by 11.78% 17.81% and 13.69%, respectively, compared with the control group. The content of urea nitrogen in group 1, group 2 and group 3 was significantly lower than that in control group (P 0.01). (2) the apparent digestibility of nutrients in group 1, group 2 and group 3 was lower than that in control group (P 0.01), respectively. (2) the apparent digestibility of nutrients in group 1, group 2 and group 3 was significantly lower than that in control group (P 0.01). Rumen methionine significantly increased the apparent digestibility of dry matter and crude protein (P0.05) and the apparent digestibility of neutral detergent fiber and acid detergent fiber (P0.01). The apparent digestibility of dry matter in the three groups was increased by 4.10% 7.81% and 6.57%, and the apparent digestibility of crude protein was 2.71% and 5.24% higher than that of the control group, respectively. The apparent digestibility of neutral detergent fiber was increased by 7.597.377.37 and the apparent digestibility of acid detergent fiber was increased by 8.2916.61and 12.35g, respectively, compared with the control group. Under the condition of this experiment, the optimum dosage of rumen methionine in the diet was 25 g / (d) considering the blood biochemical index and the apparent digestibility of nutrients.
【作者单位】：青岛农业大学动物科技学院;山东省滨州畜牧兽医研究院;
【基金】：基金项目:山东省现代农业产业技术体系牛产业创新团队(SDAIT-09-08)
【分类号】：S823.5

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