ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2014, Vol. 45 ›› Issue (6): 932-942.doi: 10.11843/j.issn.0366-6964.2014.06.011

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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

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.

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