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</td> </tr> </table> <table cellSpacing=0 cellPadding=0 width=880 align=center border=0> <tr> <td class=w width=749 bgColor=#009664 height=5></td> </tr> </table> </td> </tr> </table> <table width="884" border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF"> <tr> <td align="center"><table width="880" border="0" cellspacing="0" cellpadding="2"> <tr> <td align="left" bgcolor="#D9EED5">您现在的位置： <a class='LinkPath' href='http://www.feedtrade.com.cn/'>中国饲料行业信息网</a> >> <a class='LinkPath' href='/market/Index.html'>市场</a> >> <a class='LinkPath' href='/market/additive/Index.html'>添加剂</a> >> <a class='LinkPath' href='/market/additive/additive_research/Index.html'>应用研究</a> >> 市场正文</td> </tr> </table> <table width="850" border="0" cellspacing="0" cellpadding="0"> <tr> <td height="4"></td> </tr> </table></td> </tr> <tr> <td align="center"><table width="880" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="585" align="center" valign="top" bgcolor="#FFFFFF"><table width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#999999"> <tr> <td align="center" bgcolor="#FFFFFF"><table width="96%" border="0" align="center" cellpadding="０" cellspacing="０"> <tr> <td height="50" align="center"><h1>猪维生素营养研究进展</h1></td> </tr> <tr> <td height="24" align="center"><table width="88%" border="0" cellspacing="0" cellpadding="1"> <tr> <td>文章来源：<font color="#000099">中国养殖网</font></td> <td>更新时间：<font color="#000099">2008-2-20 10:04:52</font></td> <td>点击数：<script language='javascript' src='/market/GetHits.asp?ArticleID=182187'></script></td> <td><img src="/img/talk.gif" width="15" height="13"></td> <td><a href="#comment">评论本文</a></td> </tr> </table></td> </tr> </table></td> </tr> </table> <table width="585" border="0" cellspacing="0" cellpadding="0"> <tr> <td height="4"></td> </tr> <tr> <td height="70"><script language='javascript' src='/AD/200703/146.js'></script></td> </tr> <tr> <td height="4"></td> </tr> </table> <table width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#999999"> <tr> <td align="center" bgcolor="#FFFFFF"><table width="96%" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td align="left" height="10"></td> </tr> <tr> <td align="left" class="text"><div class="ReplyContent"><P>一、维生素A：</P> <P> 维生素A主要对视沉、生殖、骨骼、皮肤和免疫功能有重要作用。</P> <P> 大量的试验表明，维生素A是维持机体正常免疫功能的重要营养物质，高水平摄入维生素A促进免疫反应。一方面维生素A及其衍生物可促进嗜中性细胞、单核细胞、嗜酸性细胞、嗜碱性细胞和淋巴细胞的生长和分化，并调节淋巴组织和外周血液中T细胞分化亚群的数量；另一方面，维生素A缺乏会导致免疫球蛋白水平的降低，体液免疫功能的下降。</P> <P> 最近的研究证明，维生素A可能在基因的表达中起作用。维生素A具有与类固醇激素相同的功能，其衍生物与细胞核内受体结合后，促进DNA的转录，调节新陈代谢与胚胎发育，维生素A还可调控分泌生长激素基因的活性，促进组织分化和动物生长。</P> <P> NRC（1998）推荐猪维生素A的需要量为每行克日粮1300-4000U。由于猪将饲料原料中类胡萝眩素前体物转化为维生素A的效率比家禽和大鼠低，日粮中的指肪、水分和亚硝酸盐均能增加维生素A的需要量，并考虑到维生素A的促生长、免疫和提高繁殖性能作用，生产中维生素A的添加量为标准的2- 10倍。<FONT color=#ff0000></p><p align='center'><b><font color='red'>[1]</font> <a href='/market/additive/additive_research/200802/182187_2.html'>[2]</a> <a href='/market/additive/additive_research/200802/182187_3.html'>[3]</a> <a 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