›› 2018, Vol. 45 ›› Issue (10): 2716-2723.doi: 10.16431/j.cnki.1671-7236.2018.10.008

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Effects of 1, 25-dihydroxycholecalciferol on Growth Performance, Bone Mineralization and mRNA Expression of NaPi-Ⅱb and VDR in Small Intestine of Broiler

ZHANG Ning1,2, YANG Xue1,2, ZHANG Jinlong1,2, WANG Zhixiang1, HAN Jincheng2, LU Hongmei3, CHEN Cunnian3   

  1. 1. College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China;
    2. College of Biology and Food Science, Shangqiu Normal University, Shangqiu 476000, China;
    3. Henan Zhengbenqingyuan Technology Development Co., Ltd., Shangqiu 476000, China
  • Received:2018-03-15 Online:2018-10-20 Published:2018-10-20

Abstract:

The experiment was aimed to study the effects of 1,25-dihydroxycholecalciferol (1,25-(OH)2-D3) on growth performance,bone mineralization and duodenal phosphate transport gene expression.A total of 180 broilers (1 day old)were divided into 3 treatments with 6 replicates per treatment of 10 chickens per replicate.Three levels of 1,25-(OH)2-D3 were added to the basic diet:0,5 and 10 μg/kg,respectively.Broilers were slaughtered at 14 days of age,and femur,tibia,and duodenal mucosa were collected.Growth performance,bone mineralization and mRNA expressions of sodium phosphate transporter (NaPi-Ⅱb),nuclear vitamin D receptor (nVDR) and membrane vitamin D receptor (mVDR) were analyzed.The results showed that:Compared with the basic group,addition 5 μg/kg 1,25-(OH)2-D3 did not significantly affect the body weight gain,feed intake,feed and gain ration,and the weight,length,diameter,ash weight,ash content,calcium content,and phosphorus content of femur and tibia,and mRNA expression of NaPi-Ⅱb,nVDR and mVDR in the duodenum of broilers from 1 to 14 days of age (P > 0.05).Adding 10 μg/kg 1,25-(OH)2-D3 significantly reduced body weight gain,feed intake and feed conversion,the quality of femur and tibia,and the mRNA expression of NaPi-Ⅱb,nVDR,and mVDR in the duodenum of broilers (P < 0.05).In conclusion,adding 5 μg/kg 1,25-(OH)2-D3 to normal diets did not affect the growth,bone mineralization or the mRNA expression of NaPi-Ⅱb,nVDR and mVDR in duodenum of broilers.However,the addition of 10 μg/kg 1,25-(OH)2-D3 reduced the growth performance,skeletal mineralization and inhibits duodenal NaPi-Ⅱb,nVDR and mVDR gene expression at the transcriptional level.

Key words: 1,25-(OH)2-D3; broiler chicken; growth performance; bone mineralization; NaPi-Ⅱb; nVDR; mVDR

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