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<DIV class=O v:shape="_x0000_s1026"><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; COLOR: yellow; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-color-index: 7">发病因素: </SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; COLOR: yellow; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-color-index: 7; mso-fareast-language: ZH-CN" lang=EN-US></SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN" lang=EN-US>1.主要因素:过度使用高剂量的克隆30、四系和Ⅰ系,拉低鸡群中的新城疫苗</SPAN><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'">抗体: </SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN" lang=EN-US>2.次要因素:油苗中不含有强毒株,四系抗体水平高无法保护强毒感染; </SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN" lang=EN-US>3.次要因素:某些厂家疫苗污染了强毒,免疫后迅速发病! </SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN" lang=EN-US></SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN" lang=EN-US></SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 20pt; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN></SPAN></DIV><DIV style="mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1; mso-line-spacing: '100 50 0'"></DIV></DIV> |
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