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提高牛发情检出率的综合措施
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作者 任涌 《当代畜禽养殖业》 2000年第8期25-25,共1页
发情母牛有五种表现:(1)精神不安,大声哞叫(2)相互舔舐、摩擦、有互愿将颏部置于另一条牛背上等一些亲昵行为;(3)嗅闻其它母牛的阴户;(4)站立准备爬跨其它母牛或爬跨其它母牛;(5)接受爬跨并站立不动。在这五种表现中,最确实的行为征兆... 发情母牛有五种表现:(1)精神不安,大声哞叫(2)相互舔舐、摩擦、有互愿将颏部置于另一条牛背上等一些亲昵行为;(3)嗅闻其它母牛的阴户;(4)站立准备爬跨其它母牛或爬跨其它母牛;(5)接受爬跨并站立不动。在这五种表现中,最确实的行为征兆为被爬跨而站立不动,这种行为的牛90%以上可能是发情。接受爬跨并站立不动的发情行为持续时间较短,成年母牛约8小时,处女母牛6~8小时,另有20%左右的母牛发情持续时间少于6小时。为此。 展开更多
关键词 发情检出率 繁殖母牛标记 发情标准 输精制度 妊娠鉴定
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Design and error estimates of cut tobacco feeding by wind system
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作者 Zhou xiao zhong 《International Journal of Technology Management》 2013年第3期94-97,共4页
The cut tobacco transporting is the absolutely necessarily important tache, Whether the transportation process stability is a direct impact on production quality and manufacturing standards. The wind system is adopted... The cut tobacco transporting is the absolutely necessarily important tache, Whether the transportation process stability is a direct impact on production quality and manufacturing standards. The wind system is adopted by most tobacco companies because of it caused least disruptive of the cut tobacco structure and the pipe network layout of system is flexible, but the wind system is greater influence by itself, different control methods are caused greater difference of process indicators, for example essence and spice ingredients, moisture proportion and smoke flavor. Based on the above reasons, so we need to design the control method of wind system necessarily, in addition we must checkout the control accuracy opportunely, so that it is satisfied by the actual working conditions. 展开更多
关键词 cut tobacco amount of supply and demand matching air leakage compensation prevent clogging of cut tobacco error estimates
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