四株鸡传染性法氏囊病病毒毒力的研究     

李广兴  孙宗禹  刘文周  阿合买提·买买提 《中国预防兽医学报》1998,(6)

对从黑龙江省分离的４株鸡传染性法氏囊病病毒通过易感鸡接种,用病理学技术进行了致病力的研究。结果表明,各毒株毒力有一定差异,其中Ｈ３、Ｈ４株毒力高于Ｈ１、Ｈ２株,且有迅速致法氏囊萎缩的特性;Ｈ３、Ｈ４株引起试验鸡法氏囊指数显著下降（Ｐ＜００５）,脾脏指数明显增加（Ｐ＜００５）。Ｈ３、Ｈ４株接种５０日龄Ｄ７８疫苗免疫鸡,免疫保护指数分别为５０％、６０％,传统疫苗不能提供充分保护。  相似文献   

Tachykinin receptors in the equine pelvic flexure     

Sonea IM  Wilson DV  Bowker RM  Robinson NE 《Equine veterinary journal》1997,29(4):306-312

Tachykinins, of which substance P (SP) is the prototype, are neuropeptides which are widely distributed in the nervous systems. In the equine gut, SP is present in enteric nerves and is a powerful constrictor of enteric muscle; in other species, SP is also known to have potent vasodilatory and pro-inflammatory effects. The specific effects of SP are determined by the subtype of receptor present in the target tissue. There are 3 known subtypes of tachykinin receptors, distinguished by their relative affinities for SP and other tachykinins. The distribution of SP binding sites in the equine pelvic flexure was determined using 125I-Bolton Hunter SP (I-BHSP) autoradiography. Most I-BHSP binding sites were determined to be saturable and specific, therefore presumably representing tachykinin receptors. The greatest degree of I-BHSP binding occurred over very small vessels, and over the muscularis mucosae; I-BHSP binding was also intense over the circular muscle of the muscularis externa and mucosa, and present, although less intense, over the longitudinal muscle of the muscularis externa. Competition of I-BHSP with specific receptor agonists for binding sites in the equine pelvic flexure were used to determine the subtypes of tachykinin receptors present. The neurokinin-1 receptor subtype predominated in the equine pelvic flexure, followed by the neurokinin-3 receptor subtype.  相似文献   

Rules on hazardous materials     

Cobb DV 《Journal of the American Veterinary Medical Association》1983,183(9):950-951

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Desuppression of Leaf Primordia of Plagiochila arctica (Hepaticae) by Ethylene Antagonists     

Basile DV  Basile MR 《Science (New York, N.Y.)》1983,220(4601):1051-1053

Silver nitrate, alpha-aminooxyacetic acid, and aminoethoxyvinylglycine, three potent inhibitors of ethylene synthesis and action, induced the same kind of phenovariation in the liverwort Plagiochila arctica Bryhn and Kaal (Hepaticae) as do antagonists of the synthesis of hydroxyproline-containing protein. This finding (i) supports the hypothesis that hydroxyproline-protein has a role in ethylene-mediated suppression, (ii) provides evidence that the role of ethylene in the correlative development of leafy liverwort gametophytes may be similar to its role in flowering plants, and (iii) contributes to the characterization of a morphoregulatory system that mediates cellular suppression in leafy liverworts and possibly all land plants.  相似文献   

Nutrient digestibility and energy utilisation of diets based on wheat, sorghum or maize by the newly hatched broiler chick     

Thomas DV  Ravindran V  Ravindran G 《British poultry science》2008,49(4):429-435

1. Two experiments were conducted to measure changes in nutrient utilisation in the newly hatched broiler chicken. The first experiment determined the nitrogen-corrected apparent metabolisable energy (AME(N)) and total tract digestibility of starch and fat in diets based on wheat, sorghum and maize during the first two weeks post-hatch. The second experiment was conducted to confirm the results of Experiment 1 using wheat- and maize-based diets and was of 21 d duration. 2. In both experiments, changes to AME(N) with age were similar irrespective of the diet type, declining from d 3 to d 5-9 and then increasing after d 9. 3. In Experiment 1, the total tract digestibility of starch and fat exhibited a pattern similar to that of AME(N). 4. In Experiment 1, cereal effects were significant, with maize- and sorghum-based diets having higher AME(N) values than the wheat-based diet. Total tract starch digestibility determined for d 5, 7 and 14 showed no cereal differences. Total tract fat digestibility on d 7 was significantly lower for the wheat- and sorghum-based diets than for the maize-based diet, but no cereal differences were observed on d 5 or 14. 5. In Experiment 2, cereal effects were significant, with the maize-based diet having a higher AME(N) than the wheat-based diet. 6. These results showed that nutrient utilisation is compromised during the first week of life of the broiler chick.  相似文献   

荷兰发生猪神秘病：Lelystad病毒的分离     

刘文周 《国外兽医学(畜禽传染病)》1992,12(1):22-25

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进口种兔常见疾病的防治     

孙宗禹  刘文周 《经济动物学报》1979,(1)

我院自1976年至1978年,先后4批从国外引进7个品种的种兔(比利时、加里福尼亚、德国巨型、法国公羊、丹麦白、青紫兰、新西兰白兔)。饲养初期,特别是第一批产仔时,断乳后15日内的幼兔大批死亡,其中常见的多发疾病为球虫、肺炎、消化系统疾病(顶食、鼓气、便秘、胃肠炎)、葡萄球菌病等等。通过不断的实践和总结经验,初步摸索到一些防治与控制种兔疾病的方法。现将我们的初步体会介绍如下。  相似文献   

Letters to the Editor     

Frost DV 《Science (New York, N.Y.)》1963,142(3596):1126-1125

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A case of osteomyelitis of facial bones in a dog     

BENSON DV  CASE AA  KINTNER LD 《Journal of the American Veterinary Medical Association》1953,123(920):395-396

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用于牛分枝杆菌初代分离的一种新型琼脂培养基     

Cous.  DV 刘文周 《国外兽医学(畜禽传染病)》1990,10(3):39-40

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