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依据犬的大脑皮层的兴奋和抑制过程的强度、均衡性和灵活性，及其相互关系来分类，可把犬分为兴奋型、活泼型、安静型和弱型四种神经类型。 相似文献
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安静型犬是指那些神经活动过程中兴奋和抑制过程较强且均衡，但两者转化慢即灵活性差的犬。安静型犬行为特征的是：第一，兴奋和抑制过程不够强，尤其是兴奋过程；第二，灵活性差，抑制过程不易向兴奋过程转化。犬在追踪中行为特征常表现为：兴奋性偏低、工作欲望较弱、反应慢、不够灵活、条件反射建立慢且训练难度不易提高，但安静型犬常常工作仔细、认真，建立条件反 相似文献
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犬产后痉挛又称产后癫痫、产后抽搐，是神经异常兴奋而导致肌肉发生抽搐或战栗性、痉挛性营养代谢性疾病。由于此病发病急，症状类似脑炎、破伤风、神经型犬瘟热或药物中毒等，易造成误诊，犬在产前产后都有可能发生，所以此病对犬的危害极大。据我们观察此病多发生于产子多、泌乳量高的母犬、猫和小型、兴奋型犬。此病在产前、 相似文献
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统计中系马里努阿犬3个世代系谱资料和兴奋性状测试记录,对中系马里努阿犬兴奋性状不同的选育方法进行模拟研究。利用系谱资料,F3和F4世代兴奋性状数据,估算个体育种值,依据表型和育种值数据,对F4犬群按照个体表型、家系表型、个体育种值、家系育种值进行排序,各选择35%个体,筛选其在F5代中的个体,统计分析各种选择方法后代表型和遗传进展,评测不同选择方法对中系马里努阿犬兴奋性状选育最优方法。研究结果:选择中系马里努阿犬个体育种值好于选择家系育种值好于选择家系好于选择个体表型,选择中系马里努阿犬公犬效果好于选择母犬的效果。 相似文献
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犬的神经类型是指个体犬特有的能力、气质、兴趣、性格等心理特征的总和，是犬的行为的标志性特点，表现为犬心理特性的神经系统基本特性的典型结合。构成神经类型的各种心理特性，多数是某一种神经特性的表现，但有的也可能是两种神经特性的结合。通常我们把犬的神经类型分为兴奋型、活泼型、安静型、弱型四类。探讨犬的神经类型及其特征，对训练和使用警犬是有很大帮助的。只有了解了犬的特性，才能“对症下药”，采用科学的训练使用方法，了解犬的神经类型的理论，有助于我们正确地选择那些符合使用要求的犬只来进行训练。 相似文献
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一、拉布拉多犬的特点 拉布拉多犬是我国警方近几年新引进的警用犬种。它的特点是：活泼、温顺、对人亲善、体型适中、具有很强适应能力，神经类型多为兴奋型和活泼型，猎取欲、占有欲、游戏欲强烈、嗅觉灵敏，配合默契、善于从流动的空气中扑捉气味等。 相似文献
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统计昆明犬家系3个世代兴奋性测试记录和系谱数据,对昆明犬兴奋性状不同选育方法进行模拟研究。利用家系系谱资料及F3和F4世代兴奋性状数据,估算个体育种值,依据表型和育种值,对F4犬群按照个体表型、家系表型、个体育种值、家系育种值排序,各选择30%个体,寻找其在F5代中的个体,计算各种选择方法所产生后代的表型和遗传进展,评估各种选择方法对昆明犬兴奋性状选育最优方法。研究表明:选择昆明犬个体育种值好于选择昆明犬家系育种值好于选择家系表型好于选择个体表型,选择昆明犬公犬效果好于选择昆明犬母犬效果。 相似文献
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一、基础训练阶段
也称物品训练阶段。此阶段主要是利用犬衔取物品的欲望，训练犬嗅到物品气味后自动反应，使犬完成从视觉兴奋到嗅觉兴奋的转化，把犬对衔取物的兴奋转化成对搜索形式的兴奋，并在嗅到衔取气味后能自动卧下形成条件反射。 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引：1，自引：0，他引：1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献
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Meschan EM Peham C Schobesberger H Licka TF 《Veterinary journal (London, England : 1997)》2007,173(3):578-584
As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks. 相似文献
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嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.…… 相似文献
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