饲粮蛋氨酸水平对湖羊公羔营养物质消化、胃肠道pH及血清指标的影响

发布时间：2019-04-29 11:41

【摘要】：本试验旨在研究饲粮蛋氨酸水平对湖羊公羔营养物质消化、胃肠道pH及血清指标的影响。选取12对7日龄断奶的湖羊双胞胎公羔,采用配对试验设计,分为对照(CON)组和低蛋氨酸(LM)组,1对双胞胎羔羊分别分到2个组中。试验分2个阶段进行,第1阶段(8~56日龄),CON组羔羊饲喂基础代乳粉和基础开食料;LM组羔羊饲喂的代乳粉和开食料在CON组基础上分别全部扣除(0.70%和0.40%)额外添加的蛋氨酸,其余营养水平保持一致。第2阶段(57~84日龄),2组羔羊停止饲喂代乳粉且饲粮均为基础开食料。分别在第1阶段结束前(46~55日龄)和第2阶段结束前(74~83日龄)随机选取4对双胞胎羔羊进行消化代谢试验。结果表明:1)56日龄,LM组羔羊对饲粮粗蛋白质、粗脂肪、中性洗涤纤维的表观消化率均显著低于CON组(P0.05);84日龄,2组羔羊在营养物质表观消化率上均差异不显著(P0.05)。2)56日龄,LM组羔羊胃肠道中除十二指肠pH显著低于CON组(P0.05)外,其他胃肠道pH均差异不显著(P0.05);84日龄,2组羔羊在胃肠道pH上均差异不显著(P0.05)。3)除了56日龄LM组羔羊的生长激素和胰岛素浓度显著低于CON组(P0.05)外,2组羔羊其他血清指标56和84日龄均无显著性差异(P0.05)。由此可见,8~56日龄,饲粮低蛋氨酸水平可降低湖羊公羔营养物质表观消化率,以及抑制十二指肠pH和血清中生长激素、胰岛素浓度的增加;57~84日龄,提高饲粮蛋氨酸水平后,湖羊公羔的营养物质表观消化率、胃肠道pH及血清激素指标随之得到补偿。
[Abstract]:The purpose of this study was to study the effects of dietary methionine level on nutrient digestion, gastrointestinal pH and serum indexes of male lambs in Hu sheep. Twelve male lambs of 7-day-old weaned Hu sheep were divided into control (CON) group and low methionine (LM) group by paired design. One pair of twins were divided into two groups. The experiment was carried out in two stages, the first stage (8 ~ 56 days old), CON lambs were fed with basal milk substitute powder and basal food). The addition of methionine (0.70% and 0.40%) was deducted in LM group (0.70% and 0.40%) respectively on the basis of CON group, and the other nutrition levels remained the same. In the second stage (57-84 days old), two groups of lambs stopped feeding milk-substitute meal and all the lambs were fed with basal diet. Four pairs of twin lambs were randomly selected before the end of stage 1 (46 days old) and before the end of stage 2 (74 days old). The results showed that: 1) the apparent digestibility of crude protein, crude fat and neutral detergent fiber in LM group was significantly lower than that in CON group (P0.05). At the age of 84 days, there was no significant difference in apparent digestibility of nutrients between the two groups (P0.05). 2) at the age of 56 days, except pH in duodenum in LM group was significantly lower than that in CON group (P0.05). There was no significant difference in other gastrointestinal pH (P0.05). At the age of 84 days, there was no significant difference in gastrointestinal pH between the two groups (P0.05). 3) the growth hormone and insulin concentrations in the 56-day-old LM group were significantly lower than those in the CON group (P0.05). There was no significant difference in other serum indexes between 56 and 84 days old between the two groups (P0.05). The results showed that the dietary low methionine level decreased the apparent digestibility of nutrients and inhibited the increase of growth hormone (GH) and insulin (insulin) in the duodenum and serum of the male lambs at the age of 8 ~ 56 days. After raising the dietary methionine level, the apparent digestibility of nutrients, gastrointestinal pH and serum hormone indexes were compensated.
【作者单位】：中国农业科学院饲料研究所农业部饲料生物技术重点开放实验室;
【基金】：国家公益性行业(农业)科研专项(201303143) 国家肉羊产业技术体系建设专项(CARS-39)
【分类号】：S826.5

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