畜牧兽医学报 ›› 2014, Vol. 45 ›› Issue (6): 932-942.doi: 10.11843/j.issn.0366-6964.2014.06.011

• 动物营养 • 上一篇    下一篇

围产期山羊血钙稳恒与胃肠道CaBP-D9k表达对不同日粮阴阳离子差的响应研究

杨艺1,张吉鹍2,莘海亮1,田兴舟1,韩晓洁1,段永邦1,王代林3,吴文旋1*,李胜利4*   

  1. (1.贵州大学动物科学学院,贵阳 550025; 2.江西省农业科学院畜牧兽医研究所,南昌 330200;3.贵州省长顺县敦操乡,长顺 550700;4.动物营养学国家重点实验室,北京 100193)
  • 收稿日期:2013-11-27 出版日期:2014-06-23 发布日期:2014-06-23
  • 通讯作者: 吴文旋,教授,E-mail:wwx3419@126.com;李胜利,教授,博导,E-mail:lisheng0677@163.com
  • 作者简介:杨艺(1989-),贵州贵阳人,硕士,主要从事反刍动物营养研究,E-mail:yangyi19890209@gmail.com
  • 基金资助:

    国家自然科学基金(30901038;31160468;31360658);动物营养学国家重点实验室开放课题(2004DA125184F1115)

Responses of Blood Calcium and Calcium Binding Proteins-D9k Expression Level to Dietary Cation-anion Difference of Transition Goats

YANG Yi1,ZHANG Ji-kun2,XIN Hai-liang1,TIAN Xing-zhou1,HAN Xiao-jie1,DUAN Yong-bang1,WANG Dai-lin3,WU Wen-xuan1*,LI Sheng-li4*   

  1. (1.College of Animal Science,Guizhou University,Guiyang 550025, China; 2.Institute of Animal Science, Jiangxi Academy of Agricultural Science, Nanchang 330200, China; 3.Duncao Township,Changshun County,Changshun 550700, China;4.Key Laboratory of Animal Nutrition,Beijing 100193,China)
  • Received:2013-11-27 Online:2014-06-23 Published:2014-06-23

摘要:

本试验旨在研究不同日粮阴阳离子差(Dietary cation-anion difference,DCAD)对围产期山羊血浆Ca2+和胃肠道钙结合蛋白9kDa(Calcium binding proteins 9kDa,CaBP-D9k)表达水平的影响,探索低DCAD日粮预防围产期奶牛低血钙的可能机制。将27头围产期贵州黑山羊随机分为3组,每组9头,分别饲喂3组DCAD日粮:高DCAD(HD,+325)日粮组、对照组(CON,+179)、低DCAD(LD,-110)日粮组。在产前10 d、产羔当天、产后3 d分别采血并屠宰山羊,检测其血浆离子指标与胃肠道CaBP-D9k表达水平。结果表明,与高DCAD日粮相比,低DCAD日粮不影响山羊采食,酸化了山羊尿液pH(P<0.05),提高了整个试验期内血浆Cl-水平(P<0.05)。孕期内,山羊血浆Ca2+浓度随日粮DCAD水平的降低而增加(P<0.05),采食低DCAD日粮导致了更高的产后血浆Ca2+浓度(P<0.05)。除回肠、盲肠及直肠外,低DCAD日粮较高DCAD日粮明显上调山羊胃肠道其余区段内CaBP-D9k mRNA表达水平(P<0.05),并缓和了产后皱胃、空肠与回肠CaBP-D9k mRNA表达水平的降幅(P<0.05)。由此可见,低DCAD日粮有利于维持围产期山羊血浆Ca2+稳恒,伴随胃、十二指肠、空肠及结肠肠段CaBP-D9k mRNA表达水平的上调,表明上述区段的钙吸收能力得到增强。这可能是低DCAD日粮有效维持围产期奶牛血浆Ca2+稳恒的作用机制。

关键词: 日粮阴阳离子差, 血钙, 钙结合蛋白9kDa, 围产期山羊

Abstract:

The study was conducted to clarify the mechanism of low dietary cation-anion difference (DCAD) level preventing hypocalcemia in transition cows by investigating the influence of DCAD levels on blood Ca concentration and calcium binding protein-9kDa (CaBP-D9k) expression level in gastrointestinal tract of transition goats.Twenty-seven Guizhou Black goats in transition period were randomly allocated to 3 treatments with 9 goats each treatment and were fed 3 diets with varying DCAD levels:high DCAD (HD,+325),control (CON,+179) and low DCAD (LD,-110) groups,respectively.Goats were blooded on d 10 before lambing,d 0 for lambing and d 3 after lambing,respectively,and were slaughtered to detect the plasma parameters and CaBP-D9k expression level of gastrointestinal tract.Compared with high DCAD,feed intake was unaffected by low DCAD treatment (P>0.05),urine pH of goats fed LD was reduced with decreasing DCAD level (P<0.05).Compared to CON and HD,reducing DCAD level induced higher plasma Cl- and Ca2+ concentration of goats during the experiment (P<0.05).Greater CaBP-D9k mRNA expression level was observed in whole gastrointestinal tract of LD-fed goats except for ileum,cecum and rectum compared with goats in HD group (P<0.05).Moreover,feeding LD diet relieved the decline of CaBP-D9k mRNA expression level in abomasum,jejunum and colon after lambing (P<0.05).In conclusion,reducing DCAD could up-regulate CaBP-D9k expression level in stomach,proximal intestine and colon,and kept Ca2+ concentration for transition goats.The results indicated that Ca2+ absorption in the above gastrointestinal tracts was increased and would be the possible mechanism of low DCAD enhancing blood Ca homeostasis in dairy cows during periparturient period.

Key words: dietary cation-anion difference, blood calcium, calcium binding protein-9kDa, transition goats

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