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美国当地犬繁育者繁育出的犬中大部分都成为宠物犬、展览犬,只有少数的犬能够被警方选中,经严格审核后才能训练成为警犬。挑选警犬的重要指标是该犬的工作性能。工作性能是指一头工作犬应该具备例如竞技犬、军犬、警犬、保安犬、搜索犬和侦缉犬必需的特殊天赋条件。当然在宠物犬、展览犬和其它非工作犬中也有较少的犬经过训练能够成为警犬,而在警用后备犬中也有少数犬训练后不能成为警犬。 相似文献
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犬真菌主要寄生于犬被毛、表皮、趾爪角质蛋白组织,通过犬小孢子菌和须毛癣菌传染,可引起局部皮肤性质与功能的变化,能够在犬与人、犬与犬之间传播,2014年华蓥市宠物医院接到一例疑似人足癣感染犬的病例。 相似文献
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一、犬能够体察主人的情绪变化养犬的人普遍认为犬智商高,能够察言观色,了解主人的心理活动,而它本身也有着近乎人的各种心理活动。例如,当主人高兴时,犬围绕着主人奔跑跳跃、兴奋活泼,还不 相似文献
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一、犬的交流概况
同种动物之间会交流,在这个以人为主导的世界里,为了更好地生存,不同物种之间也会交流,就像人与犬的交流.最新报道称人类在3.3万年前开始驯化犬,位置是东亚南部地区.在犬与人类相处了3万余年后,犬与人已经能够和谐地在一起生活,虽然犬与人并不懂对方的语言,但通过各自的肢体语言、语音语调、面部表情的表达已经能够读懂对方的意思并灵活的沟通交流.犬与人的关系称为"依恋"关系,类似婴儿与照顾者的关系.犬长期与人类生活在一起,从最初的交流困难到目前双方能够顺利交流且相互依恋,犬与人的跨物种交流能力都得到提升,其结果是双方能够感知理解对方发出的信号并做出正确的反应.在过去的20年,人类越来越重视与犬的交流.调查研究显示犬与人类沟通交流多依赖视觉.事实上,犬在与人类相处的早期阶段就已经显示出对人类的形态、肢体语言、神态表现出高度的敏感性,它们会自发的模仿人类的姿势,注视人所指的方向. 相似文献
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《畜牧兽医科技信息》2015,(12)
<正>犬细小病毒引发的犬细小病毒病是一种急性传染病,发病犬为传染源,该病一年四季都可以发生,但是冬、春季发病率要明显高于夏、秋季。临床表现为剧烈呕吐、出血性肠炎等,成年犬一般能够耐过,幼犬死亡率很高。为此,加快研究犬细小病毒的治疗措施是极其重要的。1发病机理以及诊断1.1发病机理犬细小病毒直径非常小,但其存活率却很高,能够在不同的温度条件下存活,对福尔马林、紫外线非常敏感。犬细小病毒病的潜伏期一般在2~14d,这种病毒最先 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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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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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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Observations on the Pathology of the Spleen of the Cat 总被引：1，自引：0，他引：1
Abstract— Lesions were found in the spleen of four of sixty-three cats examined post mortem in the department, and comprised two examples of lymphosarcoma, one of chronic fibrinous peritonitis and one of subcapsular haematoma. Abnormalities were found in two cat spleens received from veterinary surgeons in general practice. In one cat the abnormalities were an haemangiosarcoma with secondary deposits in the liver and in the other extensive mast cell infiltration. In addition lesions were detected in the spleen of three of eighty-seven cats examined post mortem in general practice. The lesions were: multiple secondary deposits of adenocarcinoma from a primary tumour of the mammary gland, a ruptured spleen and a foreign body below the splenic capsule. Résumé— L'examen microscopique de soixante-trois chats pratiqué dans le service a permis de rencontrer quatre fois des lésions de la rate, dont deux lymphosarcomes, une péritonite capsulaire fibrineuse et un hématome sous-capsulaire. D'autre part des lésions ont été trouvées dans deux rates de chat expédiées par des vétérinaires exerçant en pratiaue générale. Chez un chat il s'agissait d'un htmangiosarcome avec métastases hépatiques et chex l'autre d'une infilt ation diffuse par des mastocyta. De plus, on a rencontré des llésions dnas la rate de trois chats parmi quatre-vingt sept autopsies effectuées dans le cadre d'une clientèle génárale. Ces iésions étaient dés métastases multiples d'un adénocarcinome dont la tumeur primitive siègeait dam la glande mammaire, une rupture de la rate et un corps érangers sou capsulaire. Zusammenfassung— Läsionen der Milz wurden bei vier von dreiuiidsechzig in dieser hbteilung sezierten Katzen gefunden, und zwar in zwei Fällen ein Lymphosarkom, in einem Falle eine chron-ische fibrinöse Peritonitis und in einem ein subkapsuläres Hématom. Anomalien fanden sich auch in der Milz von zwei Katzen, die aus der tierxrztlichen Praxis eingesandt wurden. Bei der einen Katze war dies ein Hämangiosarkom mit Metastasen in der Leber, bei der anderen eine weitläufige Infiltration der Mastzellen. Außerdem wurden bei drei von siebenundachtzig in der Praxis sezierten Katzen Milzläsionen gefunden. Diese bestanden am multiplen Metastasen eines Adenokarzinoms der Brustdrüse, einer Milzzerreissung und einem Fremdkörper unterhalb der Milzkapsel. 相似文献