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Comparison of locomotion problems and its economic impact on Cobb and Ross broiler strains 科布和罗斯肉鸡品种运动问题及其经济影响的比较
Pub Date : 2022-01-14 DOI: 10.30564/vsr.v3i2.4126
J. A. Villagómez-Cortés, Blanca Leydi Guevara-Torres, Luis Antonio Landín-Grandvallet, Alberto Tirado-Madrid
The rapid weight gain and fast muscle growth due to intense genetic selection and improved nutrition for additional breast muscle in broiler commercial strains affect chickens health. In order to compare the main locomotive problems in broilers of Cobb and Ross strains, two pens from a commercial farm in Veracruz, Mexico were used. The first pen housed 16,500 males and 16,500 females of Cobb strain and the second one 16,500 males and 16,500 females of Ross strain. Chicks were checked for locomotion problems from day one until their sale. Animals with problems were recorded and necropsies were performed to identify the pathology. Out of 1406 animals with locomotive problems (2.13% of the total), 58.9% were Cobb and 41.1% Ross (P <0.05). The frequency of locomotive problems was 2.51% for Cobb and 1.75% for Ross. Most common individual lesions were osteochondrosis (38.61%), inflamed joints with purulent contents (37.13%), and valgus (19.65%). Locomotive problems appeared since the first week, but its number increased as birds gained weight, particularly from the fourth week on. Problems occurred more in males than in females and in Cobb birds than in the Ross strain. Economic loss due to locomotion problems was higher for the Cobb strain.
肉鸡商业品系由于强烈的遗传选择和对额外胸肌的改善营养而导致的体重快速增加和肌肉快速生长影响着鸡的健康。为了比较Cobb和Ross品种肉鸡的主要动力问题,使用了墨西哥韦拉克鲁斯州一个商业农场的两个猪圈。第一栏Cobb系雄鼠16,500只,雌鼠16,500只;第二栏Ross系雄鼠16,500只,雌鼠16,500只。小鸡从第一天起直到出售前,都要检查它们的移动问题。记录有问题的动物,并进行尸检以确定病理。在1406只有机车问题的动物中,Cobb占58.9%,Ross占41.1% (P <0.05)。科布和罗斯的机车故障频率分别为2.51%和1.75%。最常见的个体病变是骨软骨病(38.61%)、带脓性内容物的关节炎症(37.13%)和外翻(19.65%)。火车头的问题从第一周开始就出现了,但随着鸟类体重的增加,尤其是从第四周开始,火车头的问题越来越多。问题发生在雄性比雌性多,科布鸟比罗斯鸟多。由于运动问题造成的经济损失对科布品系来说更高。
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引用次数: 0
Economic Impacts of Clinical and Sub Clinical Mastitis on Dairy Farms 临床和亚临床乳腺炎对奶牛场的经济影响
Pub Date : 2021-12-29 DOI: 10.30564/vsr.v3i2.4119
A. I. Aqib, Afshan Muneer, Muhammad Shafeeq, Nimra Kirn
Studies have reported on the economic impacts of clinical and subclinical mastitis on dairy farms. Bovine mastitis is a disorder that affects dairy farms and has a major economic impact. Most of the economic losses are the result of mastitis. Mastitis is an invasive infection that is among the most numerous and highly complicated infections in the dairy sector. Mastitis is one of the most expensive diseases in terms of production losses among animal diseases. Mastitis reduces milk production, changes milk composition, and shortens the productive life of infected cows. Farmers must concentrate on avoiding mastitis infection whilst putting in place and following a mastitis control programed. Bovine mastitis, the most significant disease of dairy herds, has huge effects on farm economics. Mastitis losses are due to reduced milk production, the cost of treatments, and culling. Major factors related to low milk yield could be low genetic potential as well as poor nutritional and managerial approaches. Most of the losses are related to somatic cell count (SCC), which is characterised by an increase in the percentage of milk. Culling costs are the costs of rearing or buying a replacement animal, mostly heifers. Overhead impacts include the replacement animals' lower milk supply effectiveness. The expense of replacing animals prematurely due to mastitis is one of the most significant areas of economic loss.
研究报告了临床和亚临床乳腺炎对奶牛场的经济影响。牛乳腺炎是一种影响奶牛场的疾病,并对经济产生重大影响。大多数经济损失都是由乳腺炎造成的。乳腺炎是一种侵袭性感染,是乳制品行业数量最多、最复杂的感染之一。就生产损失而言,乳腺炎是动物疾病中最昂贵的疾病之一。乳腺炎减少产奶量,改变牛奶成分,缩短受感染奶牛的生产寿命。农民必须集中精力避免乳腺炎感染,同时落实并遵循乳腺炎控制规划。牛乳腺炎是奶牛群中最重要的疾病,对农场经济有巨大的影响。乳腺炎造成的损失是由于产奶量减少、治疗费用和扑杀。与低产奶量有关的主要因素可能是遗传潜力低以及营养和管理方法不佳。大多数损失与体细胞计数(SCC)有关,其特征是乳汁百分比的增加。宰杀成本是饲养或购买替代动物的成本,主要是小母牛。间接影响包括替代动物较低的牛奶供应效率。由于乳腺炎而过早更换动物的费用是经济损失最重要的领域之一。
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引用次数: 0
Investigation of Two Precipitation Methods for Extracting Immunoglobulin Y (IgY) from Egg Yolks 两种沉淀法提取蛋黄中免疫球蛋白Y的研究
Pub Date : 2021-12-27 DOI: 10.30564/vsr.v3i2.4074
Tran Thi Quynh Lan, Tran Trong Kha
Two groups of hens (control and immunization group) were arranged in an experimental design with an immunization schedule of 3 injections of BSA antigen. IgY antibodies were extracted from egg yolks by two precipitation processes (chloroform and polyethylene glycol precipitates) and quantified using a standard curve of protein concentration. The purification of IgYwas confirmed by SDS-PAGE. Total protein extracted from egg yoks were less contaminated with yellow pigments (lutein and zeaxanthin) by using chloroform precipitate. The 2nd week post-immunization, IgY concentration increased respectively to 3903 ± 726 μg.ml-1 (chloroform extraction process) and 2937 ± 294 μg.ml-1 (PEG extraction process) (P < 0.01). After 3rdimmunization, IgY level obtaining from in immunization group extracted by chloroform process (6633 ± 1166 μg.ml-1) increased 2.7 times higher than that in control group (2482 ± 414 μg.ml-1). Whereas IgY concentrations obtained from PEG extraction process were not significantly different between the experimental group and control group. Chloroform and PEG precipitation methods had the same protein profile on the SDSPAGE. IgY antibody was identified by the presence of bands corresponding with IgY heavy chain (67-70 kDa) and IgY light chain (25 kDa) for both precipitation processes.
试验设计设对照组和免疫组,免疫计划为3次注射BSA抗原。通过两种沉淀法(氯仿沉淀法和聚乙二醇沉淀法)从蛋黄中提取IgY抗体,并使用蛋白浓度标准曲线进行定量。通过SDS-PAGE证实igy的纯化。氯仿沉淀物对蛋黄总蛋白中黄素(叶黄素和玉米黄质)的污染较小。免疫后第2周IgY浓度分别升高至3903±726 μg。Ml-1(氯仿提取工艺)和2937±294 μg。ml-1 (PEG提取过程)(P < 0.01)。3次免疫后,氯仿法提取免疫组IgY水平(6633±1166 μg.ml-1)比对照组(2482±414 μg.ml-1)提高了2.7倍。而PEG提取过程中获得的卵磷脂y浓度在实验组和对照组之间无显著差异。氯仿和聚乙二醇沉淀法在SDSPAGE上的蛋白谱相同。在两种沉淀过程中均存在IgY重链(67-70 kDa)和轻链(25 kDa)对应的条带,鉴定出IgY抗体。
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引用次数: 0
The Influence of Newcastle Disease Virus Major Proteins on Virulence 新城疫病毒主要蛋白对毒力的影响
Pub Date : 2021-12-13 DOI: 10.30564/vsr.v3i2.4098
Guozhong Zhang, J. Xue, Xiao Li
The Newcastle disease virus (NDV) negative-strand RNA genome containssix genes. These genes encode nucleoprotein (NP), phosphoprotein (P),matrix protein (M), fusion protein (F), hemagglutinin-neuraminidase (HN),and RNA-dependent RNA polymerase (L) proteins. The six proteins affectthe virulence of NDV in different ways, but available information on thesix proteins is disparate and scattered across many databases and sources.A comprehensive overview of the proteins determining NDV virulence islacking. This review summarizes the virulence of NDV as a complex traitdetermined by these six different proteins.
新城疫病毒(NDV)负链RNA基因组包含6个基因。这些基因编码核蛋白(NP)、磷酸化蛋白(P)、基质蛋白(M)、融合蛋白(F)、血凝素-神经氨酸酶(HN)和RNA依赖性RNA聚合酶(L)蛋白。这六种蛋白质以不同的方式影响NDV的毒力,但关于这六种蛋白质的现有信息是完全不同的,分散在许多数据库和来源中。决定NDV毒力丧失的蛋白质的全面概述。这篇综述总结了NDV的毒力是由这六种不同的蛋白质决定的复杂性状。
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引用次数: 0
Study the Haematological parameters and Oxidative stress before and after disbudding in Calves 研究犊牛脱芽前后的血液学参数和氧化应激
Pub Date : 2021-11-17 DOI: 10.36811/jvsr.2021.110018
Shiv Swaroop, Pramanik PS, Singh KD, Subodh Kumar, Verma AK
The aim of the present investigation was to examine the haematological profile and oxidative stress before and after disbudding in calves. The study was carried out at Livestock Farm Complex, College of Veterinary Science and Animal Husbandry, ANDUAT, Kumarganj, Ayodhya and nearby villages. Twenty four cattle calves were utilized to study haematological parameters that are Haemoglobin (Hb (gm/dl), Neutrophil (%), Basophil (%), PCV (%), Lymphocyte (%), Monocyte (%), TLC (103/ µl), Eosinophil (%), N/L ratio) and oxidative stress before and after disbudding in to four groups viz. control (T0), lignocaine (TL), tremadol (TT) and lignocaine+tremadol (TL-T). After medication calves were disbudded by hot iron method. The blood samples were collected for haematological parameters & for estimation of LPO (lipid peroxides) as per method described by [1] just before (0h) and after disbudding on 6h, 24h and 72h. The results showed that, at 24h, T0 group showed significantly lowest Hb (10.66±0.49%) which was statistically similar to TT and TL-T groups. At 0h, 6h and 72h means of PCV% were significantly different among treatment groups. The lowest lymphocytes (64.00±1.00) was observed in TT group at 6h. The T0 group showed significantly lowest basophil (0.00±0.00) which was statistically similar to TT and TL-T groups but significantly different from TL group at 6h. At the same interval, T0 group showed significantly lowest monocytes (4.66±0.61) which was significantly different with TL, TT and TL-T groups. At 6h, T0 group showed significantly lowest N/ L ratio (0.15±0.01) which was statistically similar to TT and TL-T groups but significantly different from TL group. At 0h, 6h and 24h LPO was significantly different among groups. At 0h, T0 group showed significantly highest (106.59±0.63) which was significantly different from TL, TT and TL-T groups. It may be concluded that no significant difference was observed in eosinophil%, TLC, neutrophil% and monocyte% counts between control and treatment groups. However, Hb%, basophil%, PCV% and lymphocyte% were significantly different between control and treatment groups. N/L ratio was significant only at 6h. Most of the cases TL-T group showed comparatively better performance. At 0h, 6h and 24h LPO was significantly different among groups. At 0h, T0 group showed significantly highest (106.59±0.63) which was significantly different from TL, TT and TL-T groups.
本研究的目的是研究小牛脱芽前后的血液学特征和氧化应激。该研究是在畜牧综合农场、兽医科学与畜牧学院、ANDUAT、Kumarganj、Ayodhya和附近村庄进行的。采用24头牛,分为对照组(T0)、利多卡因(TL)、曲马多酚(TT)和利多卡因+曲马多酚(TL- t) 4组,研究脱模前后血红蛋白(Hb (gm/dl)、中性粒细胞(%)、嗜碱性粒细胞(%)、PCV(%)、淋巴细胞(%)、单核细胞(%)、薄层色谱(103/µl)、嗜酸性粒细胞(%)、N/ l比值)和氧化应激等血液学参数。用药后用热铁法对犊牛进行脱毛。在脱光前(0h)和脱光后(6h、24h和72h),按照[1]描述的方法采集血液样本用于血液学参数和LPO(脂质过氧化物)的估计。结果显示,在24h, T0组Hb最低(10.66±0.49%),与TT和TL-T组差异有统计学意义。0h、6h、72h PCV%的平均值各组间差异有统计学意义。TT组6h淋巴细胞最低(64.00±1.00)。T0组6h嗜碱性粒细胞最低(0.00±0.00),与TT、TL- t组比较差异有统计学意义,但与TL组比较差异有统计学意义。同一时间内,T0组单核细胞数最低(4.66±0.61),与TL、TT、TL- t组差异有统计学意义。6h时,T0组N/ L比最低(0.15±0.01),与TT、TL- t组差异有统计学意义,与TL组差异有统计学意义。0h、6h、24h LPO组间差异有统计学意义。0h时,T0组最高(106.59±0.63),与TL、TT和TL- t组差异有统计学意义。由此可见,对照组和治疗组在嗜酸性粒细胞%、TLC、中性粒细胞%和单核细胞%计数上均无显著差异。对照组与治疗组Hb%、嗜碱性粒细胞%、PCV%、淋巴细胞%差异有统计学意义。N/L比值仅在6h显著。TL-T组多数病例表现较好。0h、6h、24h LPO组间差异有统计学意义。0h时,T0组最高(106.59±0.63),与TL、TT和TL- t组差异有统计学意义。
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引用次数: 0
Heavy metals in the green-lipped mussel Perna viridis: Are they safe as animal feeds? 绿唇贻贝(Perna viridis)中的重金属:作为动物饲料安全吗?
Pub Date : 2021-08-09 DOI: 10.36811/jvsr.2021.110016
C. Yap, W. Tan, W. Cheng, S. Peng, C. W. Yap, and Mohamad Saupi Ismail
The objective of this study was to compare the cited data of Cd and Pb levels in the green-lipped mussels (Perna viridis) with established maximum limits of both metals by European Union (EU) legislation for animal feeds. It was found that most mussel populations from Malaysia (90% for Cd; 87.5% for Pb) and Hong Kong (96.2% for Cd; 100% for Pb) were found to have lower levels of Cd and Pb than the maximum limits for animal feeds by EU. Therefore, both toxic metals based on the feeds of mussel meats on the animals should not pose serious toxicological effects. However, the meat of P. viridis are potential animal feeds similarly to the fish meal. Considering the accumulation of metals in the long term, future biomonitoring of Cd and Pb should focus on animal feed materials on mussel-based origins.Keywords: Animal Feed; Mussels; Safety
本研究的目的是比较绿唇贻贝(Perna viridis)中镉和铅含量的引用数据与欧盟(EU)动物饲料立法规定的两种金属的最高限量。结果发现,大多数来自马来西亚的贻贝种群(Cd含量为90%;铅含量为87.5%)和香港(镉含量为96.2%;镉和铅含量均低于欧盟规定的动物饲料最高限量。因此,以贻贝肉为饲料的两种有毒金属对动物不应造成严重的毒理学影响。然而,与鱼粉类似,绿假单胞菌的肉也是潜在的动物饲料。考虑到金属的长期积累,今后的生物监测重点应放在贻贝类动物饲料材料上。关键词:动物饲料;贻贝;安全
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引用次数: 0
Effects of Vitamin C and Dimethylsulfoxide (Dmso) on Neuro-Behaviour, Apoptosis and oxidative stress in ischaemic stroke induced rats 维生素C和二甲基亚砜(Dmso)对缺血性脑卒中大鼠神经行为、细胞凋亡和氧化应激的影响
Pub Date : 2021-08-05 DOI: 10.36811/jvsr.2021.110015
Suleiman Nasiru, Bulama Ibrahim, L. S. Bilbis, S. Yusuf, A. Abbas, S. Buhari, A. Jimoh
Background: Researches over the years have identified excitotoxicity, oxidative stress, inflammation and cell death as key contributors underlying progression of lesion in ischaemic stroke (IS). This study reports the effect of vitamin C and dimethylsulfoxide (DMSO) in the management of ischaemic stroke (IS) in Wistar rats.Method: Forty rats were divided into four groups of ten rats each. Groups 1, 2 and 3 were induced with IS by middle cerebral artery occlusion (MCAO). Anxiety like behavior and locomotor activity assessments were carried out. Group 1was treated with vitamin C (67.5mg/kg) and group 2 with DMSO (67.5mg/kg) orally for two weeks. Group 4 was neither induced nor treated. Brain tissue homogenates (cerebral cortex) were assessed for the level of calcium binding protein (S100B), antioxidant enzymes [Superoxide dismutase (SOD), Catalae (CAT), Glutathion peroxidase (GPx)] gene expressions, BCL2, Bax and Caspase3.Result: The results of this study showed that in the IS rats, there was significant (P<0.05) increase in anxiety and a significant (P<0.05) decrease in the locomotor activity. There was also significant (P<0.05) increase in S100B, caspase 3 and Bax expressions, while there was significant (P<0.05) decrease in BCL2. Treatment with vitamin C and DMSO resulted in significant (P<0.05) increase in the locomotor activity and significant (P<0.05) decrease in anxiety. There was significant (P<0.05) increase in the expression of SOD, CAT and GPx genes. Also, there was significant (P<0.05) decrease in S100B level, caspase-3 and Bax expressions, while there was significant (P<0.05) increase in BCL2. Conclusion: Conclusively, the results of this research highlighted the potentials for the use of vitamin C and DMSO in the management of IS.Keywords: Stroke; Antioxidant; Locomotor; Neuro-Behavioural; Dimethylsulfoxide Apoptosis; Oxidative Stress
背景:多年来的研究已经确定兴奋毒性、氧化应激、炎症和细胞死亡是缺血性卒中(IS)病变进展的关键因素。本研究报道了维生素C和二甲基亚砜(DMSO)在Wistar大鼠缺血性卒中(IS)治疗中的作用。方法:将40只大鼠分为4组,每组10只大鼠。1、2、3组采用大脑中动脉闭塞法(MCAO)诱导IS。进行焦虑类行为和运动活动评估。组1口服维生素C (67.5mg/kg),组2口服DMSO (67.5mg/kg),疗程2周。第4组未进行诱导和治疗。检测脑组织匀浆(大脑皮质)钙结合蛋白(S100B)、抗氧化酶[超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GPx)]基因表达、BCL2、Bax、Caspase3水平。结果:本研究结果显示,IS大鼠焦虑水平显著(P<0.05)升高,运动活动水平显著(P<0.05)降低。S100B、caspase 3、Bax表达量显著(P<0.05)升高,BCL2表达量显著(P<0.05)降低。给予维生素C和DMSO治疗后,大鼠运动活动显著(P<0.05)增加,焦虑显著(P<0.05)减少。SOD、CAT、GPx基因表达量显著(P<0.05)升高。S100B水平、caspase-3和Bax表达量显著(P<0.05)降低,BCL2表达量显著(P<0.05)升高。结论:最后,本研究结果突出了维生素C和DMSO在IS管理中的应用潜力。关键词:中风;抗氧化剂;运动;Neuro-Behavioural;二甲亚砜细胞凋亡;氧化应激
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引用次数: 0
Traditional ethnoveterinary knowledge of indigestion or diarrhoea treatments in cattle on the Bilogora hills in Croatia 克罗地亚比洛戈拉山牛消化不良或腹泻治疗的传统民族兽医知识
Pub Date : 2021-08-02 DOI: 10.36811/jvsr.2021.110014
Drazen Duricic, M. Samardžija
Traditional knowledge of plants and their preparations used for the treatment of animal diseases was passed down orally from generation to generation, so there are no written records or they are very rare. This study is based on the first documentation of ethnoveterinary knowledge for indigestion or diarrhoea treatment in cattle on the Bilogora hills in northwestern Croatia. Data collection was conducted from 2008 until 2018, in eighteen villages of four municipalities in the Koprivni?ko-križeva?ka county, Croatia. Plant specimens were well known, in addition they were confirmed and identified by the skilled botanist. Nine plant species: flax (Linum usitatissimum L.), chamomile (Matricaria recutita L.), hazelwort (Asarum europaeum L.), broad-leaved dock (Rumex obtusifolius L.), sweet chestnut (Castanea sativa Mill.), common oak (Quercus robur L.), white willow (Salix alba L.), common mallow (Malva sylvestris L.), yarrow (Achillea millefolium L.) from 7 botanical families were documented. Decoction and herbal tea were the most common preparation methods. The most often used plants to treat mild diarrhea in cattle were chamomile and broad-leaved dock, and for hard, watery diarrhoea bark of sweet chestnut and sessile oak. The most often used plants to treat indigestion in cattle were hazelwort, chamomille, and flaxseed. Farmers used mostly leaves (about 57%), flowers and stems (more than 25%), bark (about 13%), branches, and seeds (5%) for herbal preparations. Thus the aim of the present study is to document that ethnoveterinary tradition for the next generations.Keywords: Cattle; Diarrhoea; Ethnoveterinary; Indigestion
关于植物及其制剂用于治疗动物疾病的传统知识是代代相传的,因此没有书面记录或非常罕见。这项研究是基于克罗地亚西北部Bilogora山的牛消化不良或腹泻治疗的民族兽医知识的第一份文件。从2008年到2018年,在Koprivni?ko-križeva?四个市的18个村庄进行了数据收集。克罗地亚卡县。植物标本是众所周知的,此外,它们被熟练的植物学家证实和鉴定。记录了亚麻(Linum usitatissimum L.)、洋甘菊(Matricaria recutita L.)、榛子(Asarum europaeum L.)、阔叶dock (Rumex obtusifolius L.)、甜栗(Castanea sativa Mill.)、普通橡树(Quercus robur L.)、白柳(Salix alba L.)、普通锦葵(Malva sylvestris L.)、蓍草(Achillea millefolium L.)等7个植物科的9种植物。汤剂和凉茶是最常见的制备方法。最常用于治疗牛轻度腹泻的植物是洋甘菊和阔叶牛蒡,用于治疗坚硬的水样腹泻的是甜栗子树皮和无柄橡树。治疗牛消化不良最常用的植物是榛子草、洋甘菊和亚麻籽。农民主要使用叶子(约57%)、花和茎(超过25%)、树皮(约13%)、树枝和种子(5%)制作草药制剂。因此,本研究的目的是为下一代记录民族兽医传统。关键词:牛;腹泻;Ethnoveterinary;消化不良
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引用次数: 3
Review on Common Infectious Diseases of Neonatal Calves 新生牛犊常见传染病研究进展
Pub Date : 2021-07-17 DOI: 10.36811/jvsr.2021.110013
Galma Boneya Arero
Neonatal calf mortality is one of the important problems of calf rearing in dairy farms worldwide. A successful dairy farm operation requires that a large percentage of cows wean a live healthy calf every year. However, in many developing countries, a large number of calves die during the early neonatal life, this causing heavy economic loss. This is due to several infectious (bacterial, viral, and protozoal) and non-infectious factors (management around birth, colostrum management, calf housing, feeding system, hygiene, and pathogens) play an important role in calf rearing. This paper aims to review major infectious causes of neonatal calf mortality. Numerous studies have been conducted in the past from many parts of the world using both retrospective and prospective data sources to document the major causes of calf mortality. Of the infectious diseases of calves, neonatal diarrhea is a matter of major concern, and multiple etiological agents from viruses (Bovine rotavirus, Bovine coronavirus, Bovine viral diarrhea virus) from bacteria (Salmonella spp, Escherichia-coli, and Clostridium perfringens) from protozoal (Cryptosporidium-parvum) have been identified as major causes of neonatal calf mortality. Among the infectious agents, rotavirus and E. coli are mainly involved in the causation of neonatal calf diarrhea which leads to high mortality and morbidity in young calves. E. coli mainly plays its role up to the second week of life whereas, rotavirus up to the third week. Generally, early calf mortality leading to economic losses due to the cost of treatment, prophylaxis, increased susceptibility to other infections, reduced growth rates, and death of calves.Keywords: Calf Mortality; Infectious Diseases; Diarrhea
犊牛死亡率是世界范围内奶牛场犊牛饲养的重要问题之一。一个成功的奶牛场需要每年有很大比例的奶牛生下一头健康的小牛。然而,在许多发展中国家,大量小牛在新生儿早期死亡,这造成了严重的经济损失。这是由于一些传染性(细菌、病毒和原生动物)和非传染性因素(分娩前后管理、初乳管理、小牛住房、喂养系统、卫生和病原体)在小牛饲养中起着重要作用。本文旨在回顾新生儿牛犊死亡的主要感染原因。过去在世界许多地方进行了大量的研究,使用回顾性和前瞻性数据来源来记录小牛死亡的主要原因。在小牛的传染性疾病中,新生儿腹泻是一个主要关注的问题,来自细菌(沙门氏菌、大肠杆菌和产气荚膜梭菌)的病毒(牛轮状病毒、牛冠状病毒、牛病毒性腹泻病毒)和原生动物(小隐孢子虫)的多种致病因子已被确定为新生儿小牛死亡的主要原因。在感染因子中,轮状病毒和大肠杆菌是引起新生牛犊腹泻的主要原因,导致幼犊的高死亡率和发病率。大肠杆菌的作用主要持续到生命的第二周,而轮状病毒则持续到生命的第三周。一般来说,由于治疗和预防的费用、对其他感染的易感性增加、生长速度降低和犊牛死亡,犊牛早期死亡导致经济损失。关键词:犊牛死亡率;传染病;腹泻
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引用次数: 0
Evidence-based Rapid Review to Approach Diagnostic Test Research. A Veterinary Practitioners Opinion 基于证据的快速评价方法诊断试验研究。兽医的意见
Pub Date : 2021-05-10 DOI: 10.30564/VSR.V3I1.2633
J. A. Arenas, Jeff M. Pérez
In animal research systematic reviews and meta-analysis have been playing an important role improving the quality of evidence that professionals use worldwide. However, it is claimed that it is in its initial stage of development. In veterinary medicine the heterogeneity in the evaluation of variables of exposure and response makes it difficult to gather the data results for a meta-analysis and evidence-based rapid reviews and other types of reviews can accelerate the way how we obtain this information and a problem-solving approach can be developed in the veterinary medicine field.
在动物研究中,系统评价和荟萃分析在提高全球专业人员使用的证据质量方面发挥着重要作用。然而,据称它还处于发展的初级阶段。在兽医学中,暴露和反应变量评估的异质性使得难以收集数据结果进行荟萃分析,而基于证据的快速评价和其他类型的评价可以加快我们获取这些信息的方式,并可以在兽医学领域开发出解决问题的方法。
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引用次数: 0
期刊
Journal of Veterinary Science and Research
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