首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
奶牛乳房炎是危害奶牛业健康发展最严重的疾病之一,按照病程和症状可分为急性乳房炎、慢性乳房炎和隐形乳房炎三种。  相似文献   

2.
奶牛乳房炎的研究已有一百多年的历史.虽然取得较多的成绩。但是奶牛乳房炎仍是奶牛场的常发病和难以防治的疾病之一。特别是奶牛隐性乳房炎,由于无明显的临床症状,隐蔽性强。发病率高,目前仍是危害世界乳业发展的重要因素之一,现就奶牛隐性乳房炎的危害进行综述。  相似文献   

3.
奶牛乳房炎又名奶牛乳腺炎,是奶牛的一种常见病和多发病,是奶牛饲养过程中的一种花费最高的疾病之一。该病广泛存在于世界各地,是奶牛饲养中四大疾病之一。目前,全世界约有三分之一的奶牛患有各种类型乳房炎。国内外大量研究表明:奶牛乳房炎的发病率较高。在国外乳房炎的发病率为25%~60%。  相似文献   

4.
奶牛乳房炎防治技术研究进展   总被引:3,自引:0,他引:3  
奶牛乳房炎是奶牛的常见病和多发病之一,给奶牛业带来了巨大的经济损失,也严重地制约着奶牛业的发展。从奶牛乳房炎的发病现状、奶牛乳房炎的发病机理、奶牛乳房炎防治措施三个方面对奶牛乳房炎防治技术进行了综述,旨在为临床防治奶牛乳房炎提供理论指导。  相似文献   

5.
奶牛乳房炎又名奶牛乳腺炎,是奶牛的一种常见病和多发病,是奶牛饲养过程中的一种花费最高的疾病之一。该病广泛存在于世界各地,是奶牛饲养中四大疾病之一。目前,全世界约有三分之一的奶牛患有各种类型乳房炎。国内外大量研究表明:奶牛乳房炎的发病率较高。在国外乳房炎的发病率为25%~60%。  相似文献   

6.
中草药治疗奶牛乳房炎的研究概况   总被引:2,自引:0,他引:2  
奶牛乳房炎是奶牛养殖业中最常见的疾病之一,严重危害并制约奶牛养殖业的发展。文章详细介绍了西药治疗奶牛乳房炎的不足和中草药治疗奶牛乳房炎的优势,对目前中草药治疗奶牛乳房炎的研究进展进行了概括,探讨了今后中草药治疗奶牛乳房炎的发展方向。  相似文献   

7.
付秀花  王恬 《猪业科学》2001,18(2):33-36
奶牛乳房炎是危害奶牛养殖业最常见的疾病之一,给 奶牛生产造成巨大的经济损失。文章对乳房炎的发病原因、影响因素、防治现状进行了分析 ,并对传统治疗方法中存在的一些问题,尤其是应用中草药防制奶牛乳房炎展开综述。  相似文献   

8.
奶牛乳房炎的抗菌药物防治   总被引:60,自引:0,他引:60  
奶牛乳房炎作为一种多因素疾病,除了易感牛、病原微生物与环境三者间相互影响外,其复杂性还表现在致病菌的多样性,从而给防治工作带来极大困难[1,2]。今天,奶牛乳房炎仍是造成奶牛业损失最严重的疾病之一。目前,全世界约有2.2亿头奶牛,其中1/3奶牛患各种类型乳房炎,经济损失相当严重。据报道,仅美国奶牛业每年因乳房炎引起的损失估计达20亿美元[3]。播虎等在1980~1989年对我国22座城市32个奶牛场乳房炎发病情况进行了调查,结果表明,我国奶牛临床型的隐性型乳房炎的发病率均高于国外报道[4]。本世纪础年。代,抗生素的问世及随…  相似文献   

9.
关于缴纳会费和发展新会员的通知   总被引:1,自引:0,他引:1  
奶牛乳房炎是奶牛乳腺组织受到物理、化学、微生物等刺激所发生的一种乳房炎性变化,是严重影响奶牛养殖业发展的主要疾病之一。 1 奶牛乳房炎的分类 奶牛乳房炎在临床上分为急性型、慢性型和隐性乳房炎三类,即急性型、慢性型和隐性乳房炎。  相似文献   

10.
奶牛乳房炎的发生、分类与防治措施   总被引:1,自引:0,他引:1  
1奶牛乳房炎的发生情况乳房炎是奶牛经常发生的疾病,是造成奶牛生产经济损失的重要原因之一。奶牛业发达的美国现有1100万头泌乳牛,患有隐性乳房炎的达50%。我国北京、上海等地调查,隐性乳房炎发病率在60%左右,2003年东北农业大学在哈尔滨市郊区进行了隐性乳房炎的调查,发病率高达75%,造成的损失每头患病牛每年1526.25元。乳房炎的病原体有80~130多种,其中主要的病原为无乳链球菌、停乳链球菌、金黄色葡萄球菌、霉形体、乳房链球菌、大肠杆菌等。2奶牛乳房炎的分类奶牛乳房炎分为急性型,慢性型和隐性乳房炎。2.1急性型乳房炎特征是乳房红、…  相似文献   

11.
12.
13.
《饲料工业》2019,(18):54-58
应用电感耦合等离子-质谱技术(ICP-MS),建立饲料中钠、镁、铬、锰、铁、铜、锌、砷、硒、镉和铅等元素的测定方法。对饲料样品的前处理方法、仪器工作参数和11种元素标准曲线进行优化;并以加标回收、分析方法比对和重复测试说明方法的准确性和精密性。方法在0~1 000 ng/ml范围内线性良好,仪器检出限为0.557 7~5.072 ng/ml,具有良好的精密度,其回收率在88.1%~104.4%之间,相对标准偏差小于5.0%。同时与原子吸收和原子荧光方法进行比对,测定结果相近。所建立的方法简单、快速,可替代原子吸收和原子荧光方法测定饲料中的11种金属元素,为饲料的质量控制提供理想的元素分析方法。  相似文献   

14.
15.
16.
In experiment 1, 6 pregnant mares received a concentrate that contained a trace mineral premix that provided 14.3 mg Cu, 40 mg Zn, 28 mg Fe, 28 mg Mn, 0.08 mg Co, 0.16 mg I, and 0.16 mg Se/kg concentrate (group A). Seven mares received the same concentrate plus 502 mg Zn and 127 mg Cu once daily (group B). No differences (P > .05) in foal growth data, or Cu, Zn, and Fe concentrations of mare milk, mare serum, or foal serum were observed. In experiment 2, 6 pregnant mares received the same concentrate as group A (group C), and 8 mares received the same concentrate fortified with 4× the trace mineral premix (group D). Group C mares had higher serum Zn concentration at 1 day (P < 0.01) and 56 days (P < 0.04). Group C mares had higher milk Fe concentration at 28 days (P < .01), and group D mares had higher milk Cu concentration at 56 days (P < .01). Group C foals had higher serum Cu concentration at 14 days (P < .03). The results from this study provide no evidence to indicate that supplementing late gestating and lactating mares with higher dietary trace mineral levels than those recommended currently by NRC has any influence on foal growth and development, or on the Cu, Zn, and Fe concentrations of the mare milk, mare serum, or foal serum.  相似文献   

17.
Breed differences for weight (CW), height (CH), and condition score (CS) were estimated from records (n = 12,188) of 2- to 6-yr-old cows (n = 744) from Cycle IV of the U.S. Meat Animal Research Center's Germplasm Evaluation (GPE) Program. Cows were produced from mating Angus and Hereford dams to Angus, Hereford, Charolais, Shorthorn, Galloway, Longhorn, Nellore, Piedmontese, and Salers sires. Samples of Angus and Hereford sires were 1) reference sires born from 1962 through 1970 and 2) 1980s sires born in 1980 through 1987. The mixed model included cow age, season of measurement and their interactions, year of birth, pregnancy-lactation code (PL), and breedgroup as fixed effects for CW and CS. Analyses of weight adjusted for condition score included CS as a linear covariate. The model for CH excluded PL. Random effects were additive genetic and permanent environmental effects associated with the cow. Differences among breed groups were significant (P < 0.05) for all traits and were maintained through maturity with few interchanges in ranking. The order of F1 cows for weight was as follows: Charolais (506 to 635 kg for different ages), Shorthorn and Salers, reciprocal Hereford-Angus (HA) with 1980s sires, Nellore, HA with reference sires, Galloway, Piedmontese, and Longhorn (412 to 525 kg for different ages). Order for height was as follows: Nellore (136 to 140 cm), Charolais, Shorthorn, Salers, HA with 1980s sires, Piedmontese, Longhorn, Galloway and HA with reference sires (126 to 128 cm). Hereford and Angus cows with reference sires were generally lighter than those with 1980s sires. In general, breed differences for height followed those for weight except that F1 Nellore cows were tallest, which may in part be due to Bos taurus-Bos indicus heterosis for size.  相似文献   

18.
采用液相色谱-串联质谱法测定动物尿液中11种β-受体激动剂残留量,对标准溶液、体积、质谱峰面积、浓缩过程及回收率等测定不确定度因素进行了分析,通过评定各不确定度分量及标准不确定度,得出11种β-受体激动剂的扩展不确定度在0.7 ~ 1.1 ng/mL范围内.由各因素对合成不确定度的贡献比分析可知,影响较大的因素为试验回收率及标准溶液浓度.  相似文献   

19.
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号