饲粮粗蛋白质水平对猪胃肠道钙敏感受体基因表达、胃肠激素分泌及胃功能性酶活性的影响  被引量:4

Effects of Dietary Crude Protein Level on Calcium Sensing Receptor Gene Expression of Gastrointestinal Tract,Gastrointestinal Hormone Secretion and the Activities of Gastric Function Enzymes of Pigs

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作  者:县怡涵 赵秀英[1] 丁立人[1] 孟祥龙[1] 王超[1] 朱伟云[1] 杭苏琴[1] 

机构地区:[1]南京农业大学消化道微生物研究室,南京210095

出  处:《动物营养学报》2016年第11期3634-3641,共8页CHINESE JOURNAL OF ANIMAL NUTRITION

基  金:国家973项目(2013CB127301)资助

摘  要:本试验旨在研究不同饲粮粗蛋白质水平对猪胃肠道钙敏感受体(CaSR)基因表达、胃肠激素分泌及胃功能性酶(H^+-K^+-ATP酶、胃蛋白酶)活性的影响,探讨小肠CaSR基因表达量与血清胃肠激素浓度以及胃CaSR基因表达量与H^+-K^+-ATP酶和胃蛋白酶活性的关系。选择35日龄、初始体重为(9.57±0.64)kg的"杜×长×大"杂交断奶仔猪18头,随机分为3组,分别为NP组(NRC标准粗蛋白质水平组)、MP组(较标准蛋白质水平组降低3%粗蛋白质水平)和LP组(较标准粗蛋白质水平组降低6%粗蛋白质水平),每组6个重复,每个重复1头仔猪。根据猪不同生长阶段的营养需要,分别于仔猪阶段(35-80日龄)饲喂粗蛋白质水平为20%(NP组)、17%(MP组)和14%(LP组)的饲粮,生长猪阶段(81-110日龄)饲喂粗蛋白质水平为18%(NP组)、15%(MP组)和12%(LP组)的饲粮,肥育猪阶段(111-160日龄)饲喂粗蛋白质水平为16%(NP组)、13%(MP组)和10%(LP组)的饲粮,平衡饲粮的赖氨酸(Lys)、蛋氨酸(Met)、苏氨酸(Thr)和色氨酸(Trp)水平,试验期125 d。试验结束后采集前腔静脉血液,屠宰全部试验猪后取胃食糜、胃、十二指肠、空肠和回肠组织及黏膜,测定血清胃肠激素浓度、胃食糜中胃蛋白酶和胃黏膜中H^+-K^+-ATP酶活性以及胃肠道各段组织中CaSR基因表达量。结果表明:1)LP组猪胃CaSR基因表达量显著高于NP和MP组(P〈0.05),MP和LP组十二指肠及空肠CaSR基因表达量均显著低于NP组(P〈0.05),而各组回肠CaSR基因表达量无显著差异(P〉0.05)。2)与NP组相比,MP和LP组猪血清酪酪肽(PYY)和葡萄糖促胰岛素肽(GIP)浓度显著降低(P〈0.05),MP组血清胆囊收缩素(CCK)浓度显著升高(P〈0.05),LP组胃黏膜中H^+-K^+-ATP酶与胃食糜中胃蛋白酶活性显著升高(P〈0.05)。3)胃CaSR基因表达量与胃黏膜�The experiment was conducted to investigate the effects of different dietary crude protein( CP) levels on calcium sensing receptor( CaSR) gene expression of gastrointestinal tract,gastrointestinal hormone secretion and the activities of gastric function enzymes( pepsin and H^+-K^+-ATPase) of pigs,and to explore the relationships between CaSR gene expression level of small intestine and the concentration of gastrointestinal hormone in serum,CaSR gene expression level of stomach and the activities of H^+-K^+-ATPase and pepsin,respectively. Eighteen 35-day-old "Duroc × Landrace × Large White " crossed weaned pigs with initial body weight of( 9. 57 ± 0. 64) kg were randomly assigned into 3 group with 6 replicates per group and 1 pig per replicate,including NP group( NRC standard CP level group),MP group( decreased 3 % CP level compared to the standard CP level group) and LP group( decreased 6 % CP level compared to the standard CP level group). According to the nutrient needs of pigs in different growth periods,pigs were fed diets contained 20 %( NP group),17%( MP group) and 14%( LP group) CP levels in weaned pigs period( 35 to 80 days of age),respectively; diets contained 18 %( NP group),15 %( MP group) and 12 %( LP group) CP levels in growing pigs period( 81 to 110 days of age),respectively; diets contained 16 %( NP group),13 %( MP group) and 10 %( LP group) CP levels in finishing pigs period( 111 to 160 days of age),respectively. The levels of dietary lysine( Lys),methionine( Met),threonine( Thr) and tryptophan( Trp) were balanced.The experimental period lasted for 125 days. Precaval vein blood were collected by the end of the experiment,then all pigs were slaughtered,and gastric chyme,stomach,duodenum,jejunum and ileum tissues and mucosa were collected,to determination of the concentration of gastrointestinal hormones in serum,the activities of pepsin of gastric chyme and H^+-K^+-ATPase of gastric mucosa

关 键 词: 粗蛋白质水平 钙敏感受体 胃肠激素 H^+-K^+-ATP酶 胃蛋白酶 

分 类 号:S828[农业科学—畜牧学]

 

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