| 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 |
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| 引用本文： | 王杰,崔凯,王世琴,刁其玉,张乃锋.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[J].动物营养学报,2017,29(8). |
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| 作者姓名： | 王杰 崔凯 王世琴 刁其玉 张乃锋 |
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| 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,北京 100081 |
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| 基金项目： | 国家公益性行业(农业)科研专项，国家肉羊产业技术体系建设专项 |
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| 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。
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| 关 键 词： | 蛋氨酸 羔羊 消化代谢 胃肠道pH 血清指标 |
Effects of Dietary Level of Methionine on Nutrient Digestion,Gastrointestinal pH and Serum Indexes of Male Hu Lambs |
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| WANG Jie,CUI Kai,WANG Shiqin,DIAO Qiyu,ZHANG Naifeng.Effects of Dietary Level of Methionine on Nutrient Digestion,Gastrointestinal pH and Serum Indexes of Male Hu Lambs[J].Acta Zoonutrimenta Sinica,2017,29(8). |
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| Authors: | WANG Jie CUI Kai WANG Shiqin DIAO Qiyu ZHANG Naifeng |
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| Abstract: | The aim of this study was to assess the effects of dietary level of methionine on the nutrient diges-tion, gastrointestinal pH and serum indexes of male Hu lambs. Twelve pairs of male Hu twin lambs weaned at 7 days old were selected and divided into two groups ( control, CON; low methionine level, LM ) with a matched-pairs design. During 8 to 56 days, lambs were fed with and basal starter in CON, while LM group ware fed the basal milk replacer and starter deducting 0.70% and 0.4% methionine compared on control group basis, respectively. During 57 to 84 days, all lambs were fed with basal starter. Two periods of were undertak-en at 46 to 55 and 74 to 83 days of age using 4 pairs of twin lambs, respectively. Twelve pairs of male Hu twin lambs weaned at 7 days of age were selected and divided into two groups control ( CON) group and low me-thionine level ( LM) group] with a matched-pairs design, and one pair of lambs were assigned to one of the groups. The experiment consisted of two stages. Stage 1 ( 8 to 56 days of age) , lambs in CON group were fed basal milk replacer and basal starter, while those in LM group ware fed basal milk replacer and basal starter de-ducting 0.70% and 0.40% methionine on the basis of control group, respectively. Stage 2 ( 57 to 84 days of age) , all lambs were stop feeding milk replacer and fed basal starter. Four twins were selected for digestion and metabolism trials at the end of stages 1 ( 46 to 55 days of age) and 2 ( 74 to 83 days of age) , respectively. The results showed as follows:1) at 56 days of age, apparent digestibility of crude protein, ether extract and neutral detergent fiber in LM group were significantly lower than those in CON group ( P<0.05);at 84 days of age, no significant differences were observed in apparent digestibility of nutrients between groups (P>0.05). 2) At 56 days of age, no significant differences were observed in other gastrointestinal pH between groups ( P>0.05) except duodenum pH, which was significantly lower in LM group than CON group ( P<0.05); at 84 days of age, no significant differences were observed in gastrointestinal pH between groups ( P>0.05) . 3) No significant differences were observed in other serum indexes between groups at 56 and 84 days of age ( P>0.05) except growth hormone ( GH) and insulin ( INS) concentrations at 56 days of age, which were signifi-cantly lower in LM group than CON group ( P<0.05) . In conclusion, at 8 to 56 days of age, low dietary me-thionine level not only decreases apparent digestibility of nutrients, but also decreases duodenum gastrointestinal pH, GH and INS concentrations of male Hu lambs; at 57 to 84 days of age, subsequent recoveries of nutrient apparent digestibility, gastrointestinal pH and serum hormone indexes appear after the compensation of dietary methionine level. |
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| Keywords: | methionine lamb digestion and metabolism gastrointestinal pH serum index |
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