In order to evaluate the effect of control measures on brucellosis in Inner Mongolia and to further polish con-trol strategy, an evaluation was conducted on different control measures that being implemented in Siziwangqi county. The targeted control measures included tracing and culling strategy, vaccination, surveillance, quarantine and so on. The result showed that the tracing and culling strategy has distinctive effect in general, but the effect might vary along with different infection statuses. Single tracing and culling was unable to remove all the infected individuals when the prevalence was high, while“vaccination without tracing and culling strategy” had a certain effect on brucellosis control in that situation.

To investigate the pattern of increasing or decreasing of serum antibody in sheep and goats immunized with brucellosis vaccine,RPST and tube agglutination test were used in the study to determine the level of serum antibody in sheep and goats before and after immunization with Brucella strain S2 vaccine. The results indicated that the serum antibody positive rate in sheep reached the highest level 20 DPI,then started to decrease and remained relatively low level 90-360 DPI,mostly below 6%,and relatively higher in few individuals,up to 14%. The positive rate in goats reached the highest 20 DPI,then decreased and remained low or relatively low level 90-360 DPI,but with decreasing or increasing sometimes. Comparatively,antibody positive rate in goats was generally higher than in sheep,and the descending and ascending range was bigger. It was also shown that there was no significant difference in antibody posi-tive rate between 10 billion CFU dose group and 20 billion CFU dose group in same species.

<正>高致病性猪蓝耳病、猪瘟和口蹄疫是目前主要危害我国养猪业的主要疫病,也是我国重点防控的动物疫病。当前,我国主要采取疫苗免疫、扑杀等综合防制措施来控制和消灭这些猪病。所以,针对我国当前猪病的流行

<正> 1 孵化温度孵化温度一般就认为是孵箱内部温度。2 孵化温度控制的原则和依据“看胎施温”是孵化温度控制的原则。3 孵化温度控制的影响因素孵箱的类型、规模、密封程度、进出气孔的大小、加热系统与孵化规模的匹配程度、风扇转速、箱门开关次数、孵化的家禽种类、孵化厅的室温、注入水盘的水温与加水次数、入孵新的批次等,每个因素的变化都会影响到孵化温度的稳定。4 孵化温度控制的特点

1可行性 强制换羽技术已很成熟,绝食是应用最广泛且行之有效的诱导换羽方法,与野生鸟类在每年换羽期间表现出食欲减退、丢失40%体重相似.生产实践表明,在产蛋期进行1～2次强制换羽与不强制换羽相比,可显著增加产蛋收益.我国对经过一年多产蛋的鸡群进行强制换羽很普遍,美国等甚至对同一鸡群在产蛋期实施2～3次.

提高孵化率和健雏率,良好的温度控制是孵化管理的关键之一.温度控制的好坏,直接影响到胚胎的发育进程,并与其他管理因素和孵化设施密切相关,如孵箱的种类、规模、进出气孔的大小、加热系统与孵化规模的匹配程度,风扇转速、添加水盘的水温及加水次数、开关门次数、孵化禽蛋种类、孵化厅室温及入孵新的批次等,每个因素的变化都会影响到孵化温度的稳定.如何搞好温度管理,提高孵化成绩,笔者根据实际操作的经验、教训和有关资料总结如下.

在内蒙古地区5个种鸡场采血、分离血清共229份,其中3个肉种鸡场血清共184份;2个蛋种鸡场血清共45份,在ALV-J gp85抗原包被的96孔板中进行微量滴定,检查结果,ALV-J抗体阳性率:3个肉种鸡场分别为28.12%,9.38%和8.33%,平均为12.0%;2个蛋种鸡场都为0%.